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  1. Article ; Online: Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow.

    Abdalla, H / Aharonian, F / Ait Benkhali, F / Angüner, E O / Arcaro, C / Armand, C / Armstrong, T / Ashkar, H / Backes, M / Baghmanyan, V / Barbosa Martins, V / Barnacka, A / Barnard, M / Becherini, Y / Berge, D / Bernlöhr, K / Bi, B / Bissaldi, E / Böttcher, M /
    Boisson, C / Bolmont, J / de Bony de Lavergne, M / Breuhaus, M / Brun, F / Brun, P / Bryan, M / Büchele, M / Bulik, T / Bylund, T / Caroff, S / Carosi, A / Casanova, S / Chand, T / Chandra, S / Chen, A / Cotter, G / Curyło, M / Damascene Mbarubucyeye, J / Davids, I D / Davies, J / Deil, C / Devin, J / Dirson, L / Djannati-Ataï, A / Dmytriiev, A / Donath, A / Doroshenko, V / Dreyer, L / Duffy, C / Dyks, J / Egberts, K / Eichhorn, F / Einecke, S / Emery, G / Ernenwein, J-P / Feijen, K / Fegan, S / Fiasson, A / Fichet de Clairfontaine, G / Fontaine, G / Funk, S / Füßling, M / Gabici, S / Gallant, Y A / Giavitto, G / Giunti, L / Glawion, D / Glicenstein, J F / Grondin, M-H / Hahn, J / Haupt, M / Hermann, G / Hinton, J A / Hofmann, W / Hoischen, C / Holch, T L / Holler, M / Hörbe, M / Horns, D / Huber, D / Jamrozy, M / Jankowsky, D / Jankowsky, F / Jardin-Blicq, A / Joshi, V / Jung-Richardt, I / Kasai, E / Kastendieck, M A / Katarzyński, K / Katz, U / Khangulyan, D / Khélifi, B / Klepser, S / Kluźniak, W / Komin, Nu / Konno, R / Kosack, K / Kostunin, D / Kreter, M / Lamanna, G / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leuschner, F / Levy, C / Lohse, T / Lypova, I / Mackey, J / Majumdar, J / Malyshev, D / Marandon, V / Marchegiani, P / Marcowith, A / Mares, A / Martí-Devesa, G / Marx, R / Maurin, G / Meintjes, P J / Meyer, M / Mitchell, A / Moderski, R / Mohrmann, L / Montanari, A / Moore, C / Morris, P / Moulin, E / Muller, J / Murach, T / Nakashima, K / Nayerhoda, A / de Naurois, M / Ndiyavala, H / Niemiec, J / Oakes, L / O'Brien, P / Odaka, H / Ohm, S / Olivera-Nieto, L / de Ona Wilhelmi, E / Ostrowski, M / Panny, S / Panter, M / Parsons, R D / Peron, G / Peyaud, B / Piel, Q / Pita, S / Poireau, V / Priyana Noel, A / Prokhorov, D A / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Rauth, R / Reichherzer, P / Reimer, A / Reimer, O / Remy, Q / Renaud, M / Rieger, F / Rinchiuso, L / Romoli, C / Rowell, G / Rudak, B / Ruiz-Velasco, E / Sahakian, V / Sailer, S / Salzmann, H / Sanchez, D A / Santangelo, A / Sasaki, M / Scalici, M / Schäfer, J / Schüssler, F / Schutte, H M / Schwanke, U / Seglar-Arroyo, M / Senniappan, M / Seyffert, A S / Shafi, N / Shapopi, J N S / Shiningayamwe, K / Simoni, R / Sinha, A / Sol, H / Specovius, A / Spencer, S / Spir-Jacob, M / Stawarz, Ł / Sun, L / Steenkamp, R / Stegmann, C / Steinmassl, S / Steppa, C / Takahashi, T / Tam, T / Tavernier, T / Taylor, A M / Terrier, R / Thiersen, J H E / Tiziani, D / Tluczykont, M / Tomankova, L / Tsirou, M / Tuffs, R / Uchiyama, Y / van der Walt, D J / van Eldik, C / van Rensburg, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Vincent, P / Vink, J / Völk, H J / Wadiasingh, Z / Wagner, S J / Watson, J / Werner, F / White, R / Wierzcholska, A / Wong, Yu Wun / Yusafzai, A / Zacharias, M / Zanin, R / Zargaryan, D / Zdziarski, A A / Zech, A / Zhu, S J / Zorn, J / Zouari, S / Żywucka, N / Evans, P / Page, K

    Science (New York, N.Y.)

    2021  Volume 372, Issue 6546, Page(s) 1081–1085

    Abstract: Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events. We report the detection of very-high-energy (VHE) gamma rays from the ... ...

    Abstract Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events. We report the detection of very-high-energy (VHE) gamma rays from the afterglow of GRB 190829A, between 4 and 56 hours after the trigger, using the High Energy Stereoscopic System (H.E.S.S.). The low luminosity and redshift of GRB 190829A reduce both internal and external absorption, allowing determination of its intrinsic energy spectrum. Between energies of 0.18 and 3.3 tera-electron volts, this spectrum is described by a power law with photon index of 2.07 ± 0.09, similar to the x-ray spectrum. The x-ray and VHE gamma-ray light curves also show similar decay profiles. These similar characteristics in the x-ray and gamma-ray bands challenge GRB afterglow emission scenarios.
    Language English
    Publishing date 2021-05-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.abe8560
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A very-high-energy component deep in the γ-ray burst afterglow.

    Abdalla, H / Adam, R / Aharonian, F / Ait Benkhali, F / Angüner, E O / Arakawa, M / Arcaro, C / Armand, C / Ashkar, H / Backes, M / Barbosa Martins, V / Barnard, M / Becherini, Y / Berge, D / Bernlöhr, K / Bissaldi, E / Blackwell, R / Böttcher, M / Boisson, C /
    Bolmont, J / Bonnefoy, S / Bregeon, J / Breuhaus, M / Brun, F / Brun, P / Bryan, M / Büchele, M / Bulik, T / Bylund, T / Capasso, M / Caroff, S / Carosi, A / Casanova, S / Cerruti, M / Chand, T / Chandra, S / Chen, A / Colafrancesco, S / Curyło, M / Davids, I D / Deil, C / Devin, J / deWilt, P / Dirson, L / Djannati-Ataï, A / Dmytriiev, A / Donath, A / Doroshenko, V / Dyks, J / Egberts, K / Emery, G / Ernenwein, J-P / Eschbach, S / Feijen, K / Fegan, S / Fiasson, A / Fontaine, G / Funk, S / Füßling, M / Gabici, S / Gallant, Y A / Gaté, F / Giavitto, G / Giunti, L / Glawion, D / Glicenstein, J F / Gottschall, D / Grondin, M-H / Hahn, J / Haupt, M / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hofmann, W / Hoischen, C / Holch, T L / Holler, M / Horns, D / Huber, D / Iwasaki, H / Jamrozy, M / Jankowsky, D / Jankowsky, F / Jardin-Blicq, A / Jung-Richardt, I / Kastendieck, M A / Katarzyński, K / Katsuragawa, M / Katz, U / Khangulyan, D / Khélifi, B / King, J / Klepser, S / Kluźniak, W / Komin, Nu / Kosack, K / Kostunin, D / Kreter, M / Lamanna, G / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leser, E / Levy, C / Lohse, T / Lypova, I / Mackey, J / Majumdar, J / Malyshev, D / Marandon, V / Marcowith, A / Mares, A / Mariaud, C / Martí-Devesa, G / Marx, R / Maurin, G / Meintjes, P J / Mitchell, A M W / Moderski, R / Mohamed, M / Mohrmann, L / Moore, C / Moulin, E / Muller, J / Murach, T / Nakashima, S / de Naurois, M / Ndiyavala, H / Niederwanger, F / Niemiec, J / Oakes, L / O'Brien, P / Odaka, H / Ohm, S / de Ona Wilhelmi, E / Ostrowski, M / Oya, I / Panter, M / Parsons, R D / Perennes, C / Petrucci, P-O / Peyaud, B / Piel, Q / Pita, S / Poireau, V / Priyana Noel, A / Prokhorov, D A / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Rauth, R / Reimer, A / Reimer, O / Remy, Q / Renaud, M / Rieger, F / Rinchiuso, L / Romoli, C / Rowell, G / Rudak, B / Ruiz-Velasco, E / Sahakian, V / Sailer, S / Saito, S / Sanchez, D A / Santangelo, A / Sasaki, M / Schlickeiser, R / Schüssler, F / Schulz, A / Schutte, H M / Schwanke, U / Schwemmer, S / Seglar-Arroyo, M / Senniappan, M / Seyffert, A S / Shafi, N / Shiningayamwe, K / Simoni, R / Sinha, A / Sol, H / Specovius, A / Spir-Jacob, M / Stawarz, Ł / Steenkamp, R / Stegmann, C / Steppa, C / Takahashi, T / Tavernier, T / Taylor, A M / Terrier, R / Tiziani, D / Tluczykont, M / Trichard, C / Tsirou, M / Tsuji, N / Tuffs, R / Uchiyama, Y / van der Walt, D J / van Eldik, C / van Rensburg, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Vincent, P / Vink, J / Völk, H J / Vuillaume, T / Wadiasingh, Z / Wagner, S J / White, R / Wierzcholska, A / Yang, R / Yoneda, H / Zacharias, M / Zanin, R / Zdziarski, A A / Zech, A / Ziegler, A / Zorn, J / Żywucka, N / de Palma, F / Axelsson, M / Roberts, O J

    Nature

    2019  Volume 575, Issue 7783, Page(s) 464–467

    Abstract: Gamma-ray bursts (GRBs) are brief flashes of γ-rays and are considered to be the most energetic explosive phenomena in the ... ...

    Abstract Gamma-ray bursts (GRBs) are brief flashes of γ-rays and are considered to be the most energetic explosive phenomena in the Universe
    Language English
    Publishing date 2019-11-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-019-1743-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Search for γ-Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with H.E.S.S.

    Abdallah, H / Abramowski, A / Aharonian, F / Ait Benkhali, F / Angüner, E O / Arakawa, M / Arrieta, M / Aubert, P / Backes, M / Balzer, A / Barnard, M / Becherini, Y / Becker Tjus, J / Berge, D / Bernhard, S / Bernlöhr, K / Blackwell, R / Böttcher, M / Boisson, C /
    Bolmont, J / Bonnefoy, S / Bordas, P / Bregeon, J / Brun, F / Brun, P / Bryan, M / Büchele, M / Bulik, T / Capasso, M / Caroff, S / Carosi, A / Carr, J / Casanova, S / Cerruti, M / Chakraborty, N / Chaves, R C G / Chen, A / Chevalier, J / Colafrancesco, S / Condon, B / Conrad, J / Davids, I D / Decock, J / Deil, C / Devin, J / deWilt, P / Dirson, L / Djannati-Ataï, A / Domainko, W / Donath, A / Drury, L O'C / Dutson, K / Dyks, J / Edwards, T / Egberts, K / Eger, P / Emery, G / Ernenwein, J-P / Eschbach, S / Farnier, C / Fegan, S / Fernandes, M V / Fiasson, A / Fontaine, G / Förster, A / Funk, S / Füßling, M / Gabici, S / Gallant, Y A / Garrigoux, T / Gaté, F / Giavitto, G / Giebels, B / Glawion, D / Glicenstein, J F / Gottschall, D / Grondin, M-H / Hahn, J / Haupt, M / Hawkes, J / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hofmann, W / Hoischen, C / Holch, T L / Holler, M / Horns, D / Ivascenko, A / Iwasaki, H / Jacholkowska, A / Jamrozy, M / Janiak, M / Jankowsky, D / Jankowsky, F / Jingo, M / Jouvin, L / Jung-Richardt, I / Kastendieck, M A / Katarzyński, K / Katsuragawa, M / Katz, U / Kerszberg, D / Khangulyan, D / Khélifi, B / King, J / Klepser, S / Klochkov, D / Kluźniak, W / Komin, Nu / Kosack, K / Krakau, S / Kraus, M / Krüger, P P / Laffon, H / Lamanna, G / Lau, J / Lees, J-P / Lefaucheur, J / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leser, E / Liu, R / Lohse, T / Lorentz, M / López-Coto, R / Lypova, I / Malyshev, D / Marandon, V / Marcowith, A / Mariaud, C / Marx, R / Maurin, G / Maxted, N / Mayer, M / Meintjes, P J / Meyer, M / Mitchell, A M W / Moderski, R / Mohamed, M / Mohrmann, L / Morå, K / Moulin, E / Murach, T / Nakashima, S / de Naurois, M / Ndiyavala, H / Niederwanger, F / Niemiec, J / Oakes, L / O'Brien, P / Odaka, H / Ohm, S / Ostrowski, M / Oya, I / Padovani, M / Panter, M / Parsons, R D / Pekeur, N W / Pelletier, G / Perennes, C / Petrucci, P-O / Peyaud, B / Piel, Q / Pita, S / Poireau, V / Poon, H / Prokhorov, D / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Rauth, R / Reimer, A / Reimer, O / Renaud, M / de Los Reyes, R / Rieger, F / Rinchiuso, L / Romoli, C / Rowell, G / Rudak, B / Rulten, C B / Sahakian, V / Saito, S / Sanchez, D A / Santangelo, A / Sasaki, M / Schandri, M / Schlickeiser, R / Schüssler, F / Schulz, A / Schwanke, U / Schwemmer, S / Seglar-Arroyo, M / Settimo, M / Seyffert, A S / Shafi, N / Shilon, I / Shiningayamwe, K / Simoni, R / Sol, H / Spanier, F / Spir-Jacob, M / Stawarz, Ł / Steenkamp, R / Stegmann, C / Steppa, C / Sushch, I / Takahashi, T / Tavernet, J-P / Tavernier, T / Taylor, A M / Terrier, R / Tibaldo, L / Tiziani, D / Tluczykont, M / Trichard, C / Tsirou, M / Tsuji, N / Tuffs, R / Uchiyama, Y / van der Walt, J / van Eldik, C / van Rensburg, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Viana, A / Vincent, P / Vink, J / Voisin, F / Völk, H J / Vuillaume, T / Wadiasingh, Z / Wagner, S J / Wagner, P / Wagner, R M / White, R / Wierzcholska, A / Willmann, P / Wörnlein, A / Wouters, D / Yang, R / Zaborov, D / Zacharias, M / Zanin, R / Zdziarski, A A / Zech, A / Zefi, F / Ziegler, A / Zorn, J / Żywucka, N

    Physical review letters

    2018  Volume 120, Issue 20, Page(s) 201101

    Abstract: Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth. ...

    Abstract Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth. We report on a search for a monoenergetic spectral line from self-annihilations of DM particles in the energy range from 300 GeV to 70 TeV using a two-dimensional maximum likelihood method taking advantage of both the spectral and spatial features of the signal versus background. The analysis makes use of Galactic center observations accumulated over ten years (2004-2014) with the H.E.S.S. array of ground-based Cherenkov telescopes. No significant γ-ray excess above the background is found. We derive upper limits on the annihilation cross section ⟨σv⟩ for monoenergetic DM lines at the level of 4×10^{-28}  cm^{3} s^{-1} at 1 TeV, assuming an Einasto DM profile for the Milky Way halo. For a DM mass of 1 TeV, they improve over the previous ones by a factor of 6. The present constraints are the strongest obtained so far for DM particles in the mass range 300 GeV-70 TeV. Ground-based γ-ray observations have reached sufficient sensitivity to explore relevant velocity-averaged cross sections for DM annihilation into two γ-ray photons at the level expected from the thermal relic density for TeV DM particles.
    Language English
    Publishing date 2018-05-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.120.201101
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Constraints on an annihilation signal from a core of constant dark matter density around the milky way center with H.E.S.S.

    Abramowski, A / Aharonian, F / Ait Benkhali, F / Akhperjanian, A G / Angüner, E O / Backes, M / Balenderan, S / Balzer, A / Barnacka, A / Becherini, Y / Becker Tjus, J / Berge, D / Bernhard, S / Bernlöhr, K / Birsin, E / Biteau, J / Böttcher, M / Boisson, C / Bolmont, J /
    Bordas, P / Bregeon, J / Brun, F / Brun, P / Bryan, M / Bulik, T / Carrigan, S / Casanova, S / Chadwick, P M / Chakraborty, N / Chalme-Calvet, R / Chaves, R C G / Chrétien, M / Colafrancesco, S / Cologna, G / Conrad, J / Couturier, C / Cui, Y / Davids, I D / Degrange, B / Deil, C / deWilt, P / Djannati-Ataï, A / Domainko, W / Donath, A / Drury, L O'C / Dubus, G / Dutson, K / Dyks, J / Dyrda, M / Edwards, T / Egberts, K / Eger, P / Espigat, P / Farnier, C / Fegan, S / Feinstein, F / Fernandes, M V / Fernandez, D / Fiasson, A / Fontaine, G / Förster, A / Füßling, M / Gabici, S / Gajdus, M / Gallant, Y A / Garrigoux, T / Giavitto, G / Giebels, B / Glicenstein, J F / Gottschall, D / Grondin, M-H / Grudzińska, M / Hadasch, D / Häffner, S / Hahn, J / Harris, J / Heinzelmann, G / Henri, G / Hermann, G / Hervet, O / Hillert, A / Hinton, J A / Hofmann, W / Hofverberg, P / Holler, M / Horns, D / Ivascenko, A / Jacholkowska, A / Jahn, C / Jamrozy, M / Janiak, M / Jankowsky, F / Jung-Richardt, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kaufmann, S / Khélifi, B / Kieffer, M / Klepser, S / Klochkov, D / Kluźniak, W / Kolitzus, D / Komin, Nu / Kosack, K / Krakau, S / Krayzel, F / Krüger, P P / Laffon, H / Lamanna, G / Lefaucheur, J / Lefranc, V / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Lohse, T / Lopatin, A / Lu, C-C / Marandon, V / Marcowith, A / Marx, R / Maurin, G / Maxted, N / Mayer, M / McComb, T J L / Méhault, J / Meintjes, P J / Menzler, U / Meyer, M / Mitchell, A M W / Moderski, R / Mohamed, M / Morå, K / Moulin, E / Murach, T / de Naurois, M / Niemiec, J / Nolan, S J / Oakes, L / Odaka, H / Ohm, S / Opitz, B / Ostrowski, M / Oya, I / Panter, M / Parsons, R D / Paz Arribas, M / Pekeur, N W / Pelletier, G / Petrucci, P-O / Peyaud, B / Pita, S / Poon, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Reichardt, I / Reimer, A / Reimer, O / Renaud, M / de Los Reyes, R / Rieger, F / Romoli, C / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Sahakian, V / Salek, D / Sanchez, D A / Santangelo, A / Schlickeiser, R / Schüssler, F / Schulz, A / Schwanke, U / Schwarzburg, S / Schwemmer, S / Sol, H / Spanier, F / Spengler, G / Spies, F / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Stycz, K / Sushch, I / Tavernet, J-P / Tavernier, T / Taylor, A M / Terrier, R / Tluczykont, M / Trichard, C / Valerius, K / van Eldik, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Viana, A / Vincent, P / Vink, J / Völk, H J / Volpe, F / Vorster, M / Vuillaume, T / Wagner, S J / Wagner, P / Wagner, R M / Ward, M / Weidinger, M / Weitzel, Q / White, R / Wierzcholska, A / Willmann, P / Wörnlein, A / Wouters, D / Yang, R / Zabalza, V / Zaborov, D / Zacharias, M / Zdziarski, A A / Zech, A / Zechlin, H-S

    Physical review letters

    2015  Volume 114, Issue 8, Page(s) 81301

    Abstract: An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No significant signal is found in a ... ...

    Abstract An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No significant signal is found in a total of ∼9  h of on-off observations. Upper limits on the velocity averaged cross section, ⟨σv⟩, for the annihilation of dark matter particles with masses in the range of ∼300  GeV to ∼10  TeV are derived. In contrast to previous constraints derived from observations of the Galactic center region, the constraints that are derived here apply also under the assumption of a central core of constant dark matter density around the center of the Galaxy. Values of ⟨σv⟩ that are larger than 3×10^{-24}  cm^{3}/s are excluded for dark matter particles with masses between ∼1 and ∼4  TeV at 95% C.L. if the radius of the central dark matter density core does not exceed 500 pc. This is the strongest constraint that is derived on ⟨σv⟩ for annihilating TeV mass dark matter without the assumption of a centrally cusped dark matter density distribution in the search region.
    Language English
    Publishing date 2015-02-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.114.081301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: H.E.S.S. Limits on Linelike Dark Matter Signatures in the 100 GeV to 2 TeV Energy Range Close to the Galactic Center.

    Abdalla, H / Abramowski, A / Aharonian, F / Ait Benkhali, F / Akhperjanian, A G / Andersson, T / Angüner, E O / Arrieta, M / Aubert, P / Backes, M / Balzer, A / Barnard, M / Becherini, Y / Becker Tjus, J / Berge, D / Bernhard, S / Bernlöhr, K / Birsin, E / Blackwell, R /
    Böttcher, M / Boisson, C / Bolmont, J / Bordas, P / Bregeon, J / Brun, F / Brun, P / Bryan, M / Bulik, T / Capasso, M / Carr, J / Casanova, S / Chakraborty, N / Chalme-Calvet, R / Chaves, R C G / Chen, A / Chevalier, J / Chrétien, M / Colafrancesco, S / Cologna, G / Condon, B / Conrad, J / Couturier, C / Cui, Y / Davids, I D / Degrange, B / Deil, C / Devin, J / deWilt, P / Djannati-Ataï, A / Domainko, W / Donath, A / Drury, L O'C / Dubus, G / Dutson, K / Dyks, J / Dyrda, M / Edwards, T / Egberts, K / Eger, P / Ernenwein, J-P / Eschbach, S / Farnier, C / Fegan, S / Fernandes, M V / Fiasson, A / Fontaine, G / Förster, A / Funk, S / Füßling, M / Gabici, S / Gajdus, M / Gallant, Y A / Garrigoux, T / Giavitto, G / Giebels, B / Glicenstein, J F / Gottschall, D / Goyal, A / Grondin, M-H / Grudzińska, M / Hadasch, D / Hahn, J / Hawkes, J / Heinzelmann, G / Henri, G / Hermann, G / Hervet, O / Hillert, A / Hinton, J A / Hofmann, W / Hoischen, C / Holler, M / Horns, D / Ivascenko, A / Jacholkowska, A / Jamrozy, M / Janiak, M / Jankowsky, D / Jankowsky, F / Jingo, M / Jogler, T / Jouvin, L / Jung-Richardt, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kerszberg, D / Khélifi, B / Kieffer, M / King, J / Klepser, S / Klochkov, D / Kluźniak, W / Kolitzus, D / Komin, Nu / Kosack, K / Krakau, S / Kraus, M / Krayzel, F / Krüger, P P / Laffon, H / Lamanna, G / Lau, J / Lees, J-P / Lefaucheur, J / Lefranc, V / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leser, E / Liu, R / Lohse, T / Lorentz, M / Lypova, I / Marandon, V / Marcowith, A / Mariaud, C / Marx, R / Maurin, G / Maxted, N / Mayer, M / Meintjes, P J / Meyer, M / Mitchell, A M W / Moderski, R / Mohamed, M / Morå, K / Moulin, E / Murach, T / de Naurois, M / Niederwanger, F / Niemiec, J / Oakes, L / O'Brien, P / Odaka, H / Ohm, S / Ostrowski, M / Öttl, S / Oya, I / Padovani, M / Panter, M / Parsons, R D / Paz Arribas, M / Pekeur, N W / Pelletier, G / Perennes, C / Petrucci, P-O / Peyaud, B / Pita, S / Poon, H / Prokhorov, D / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Reimer, A / Reimer, O / Renaud, M / de Los Reyes, R / Rieger, F / Romoli, C / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Sahakian, V / Salek, D / Sanchez, D A / Santangelo, A / Sasaki, M / Schlickeiser, R / Schüssler, F / Schulz, A / Schwanke, U / Schwemmer, S / Settimo, M / Seyffert, A S / Shafi, N / Shilon, I / Simoni, R / Sol, H / Spanier, F / Spengler, G / Spies, F / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Stycz, K / Sushch, I / Tavernet, J-P / Tavernier, T / Taylor, A M / Terrier, R / Tibaldo, L / Tluczykont, M / Trichard, C / Tuffs, R / van der Walt, J / van Eldik, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Viana, A / Vincent, P / Vink, J / Voisin, F / Völk, H J / Vuillaume, T / Wadiasingh, Z / Wagner, S J / Wagner, P / Wagner, R M / White, R / Wierzcholska, A / Willmann, P / Wörnlein, A / Wouters, D / Yang, R / Zabalza, V / Zaborov, D / Zacharias, M / Zdziarski, A A / Zech, A / Zefi, F / Ziegler, A / Żywucka, N

    Physical review letters

    2016  Volume 117, Issue 15, Page(s) 151302

    Abstract: A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. ... ...

    Abstract A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. The upgraded analysis along with newer data extend the energy coverage of the previous measurement down to 100 GeV. The 18 h of data collected with the H.E.S.S. array allow one to rule out at 95% C.L. the presence of a 130 GeV line (at l=-1.5°, b=0° and for a dark matter profile centered at this location) previously reported in Fermi-LAT data. This new analysis overlaps significantly in energy with previous Fermi-LAT and H.E.S.S.
    Results: No significant excess associated with dark matter annihilations was found in the energy range of 100 GeV to 2 TeV and upper limits on the gamma-ray flux and the velocity weighted annihilation cross section are derived adopting an Einasto dark matter halo profile. Expected limits for present and future large statistics H.E.S.S. observations are also given.
    Language English
    Publishing date 2016-10-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.117.151302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Search for Dark Matter Annihilations towards the Inner Galactic Halo from 10 Years of Observations with H.E.S.S.

    Abdallah, H / Abramowski, A / Aharonian, F / Ait Benkhali, F / Akhperjanian, A G / Angüner, E / Arrieta, M / Aubert, P / Backes, M / Balzer, A / Barnard, M / Becherini, Y / Becker Tjus, J / Berge, D / Bernhard, S / Bernlöhr, K / Birsin, E / Blackwell, R / Böttcher, M /
    Boisson, C / Bolmont, J / Bordas, P / Bregeon, J / Brun, F / Brun, P / Bryan, M / Bulik, T / Capasso, M / Carr, J / Casanova, S / Chakraborty, N / Chalme-Calvet, R / Chaves, R C G / Chen, A / Chevalier, J / Chrétien, M / Colafrancesco, S / Cologna, G / Condon, B / Conrad, J / Couturier, C / Cui, Y / Davids, I D / Degrange, B / Deil, C / deWilt, P / Djannati-Ataï, A / Domainko, W / Donath, A / Drury, L O'C / Dubus, G / Dutson, K / Dyks, J / Dyrda, M / Edwards, T / Egberts, K / Eger, P / Ernenwein, J-P / Eschbach, S / Farnier, C / Fegan, S / Fernandes, M V / Fiasson, A / Fontaine, G / Förster, A / Funk, S / Füßling, M / Gabici, S / Gajdus, M / Gallant, Y A / Garrigoux, T / Giavitto, G / Giebels, B / Glicenstein, J F / Gottschall, D / Goyal, A / Grondin, M-H / Grudzińska, M / Hadasch, D / Hahn, J / Hawkes, J / Heinzelmann, G / Henri, G / Hermann, G / Hervet, O / Hillert, A / Hinton, J A / Hofmann, W / Hoischen, C / Holler, M / Horns, D / Ivascenko, A / Jacholkowska, A / Jamrozy, M / Janiak, M / Jankowsky, D / Jankowsky, F / Jingo, M / Jogler, T / Jouvin, L / Jung-Richardt, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kerszberg, D / Khélifi, B / Kieffer, M / King, J / Klepser, S / Klochkov, D / Kluźniak, W / Kolitzus, D / Komin, Nu / Kosack, K / Krakau, S / Kraus, M / Krayzel, F / Krüger, P P / Laffon, H / Lamanna, G / Lau, J / Lees, J-P / Lefaucheur, J / Lefranc, V / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leser, E / Lohse, T / Lorentz, M / Lui, R / Lypova, I / Marandon, V / Marcowith, A / Mariaud, C / Marx, R / Maurin, G / Maxted, N / Mayer, M / Meintjes, P J / Menzler, U / Meyer, M / Mitchell, A M W / Moderski, R / Mohamed, M / Morå, K / Moulin, E / Murach, T / de Naurois, M / Niederwanger, F / Niemiec, J / Oakes, L / Odaka, H / Ohm, S / Öttl, S / Ostrowski, M / Oya, I / Padovani, M / Panter, M / Parsons, R D / Paz Arribas, M / Pekeur, N W / Pelletier, G / Petrucci, P-O / Peyaud, B / Pita, S / Poon, H / Prokhorov, D / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Raab, S / Reimer, A / Reimer, O / Renaud, M / de Los Reyes, R / Rieger, F / Romoli, C / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Sahakian, V / Salek, D / Sanchez, D A / Santangelo, A / Sasaki, M / Schlickeiser, R / Schüssler, F / Schulz, A / Schwanke, U / Schwemmer, S / Seyffert, A S / Shafi, N / Simoni, R / Sol, H / Spanier, F / Spengler, G / Spieß, F / Stawarz, L / Steenkamp, R / Stegmann, C / Stinzing, F / Stycz, K / Sushch, I / Tavernet, J-P / Tavernier, T / Taylor, A M / Terrier, R / Tluczykont, M / Trichard, C / Tuffs, R / van der Walt, J / van Eldik, C / van Soelen, B / Vasileiadis, G / Veh, J / Venter, C / Viana, A / Vincent, P / Vink, J / Voisin, F / Völk, H J / Vuillaume, T / Wadiasingh, Z / Wagner, S J / Wagner, P / Wagner, R M / White, R / Wierzcholska, A / Willmann, P / Wörnlein, A / Wouters, D / Yang, R / Zabalza, V / Zaborov, D / Zacharias, M / Zdziarski, A A / Zech, A / Zefi, F / Ziegler, A / Żywucka, N

    Physical review letters

    2016  Volume 117, Issue 11, Page(s) 111301

    Abstract: The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles using γ-ray observations towards ... ...

    Abstract The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles using γ-ray observations towards the inner 300 pc of the Milky Way, with the H.E.S.S. array of ground-based Cherenkov telescopes. The analysis is based on a 2D maximum likelihood method using Galactic Center (GC) data accumulated by H.E.S.S. over the last 10 years (2004-2014), and does not show any significant γ-ray signal above background. Assuming Einasto and Navarro-Frenk-White DM density profiles at the GC, we derive upper limits on the annihilation cross section ⟨σv⟩. These constraints are the strongest obtained so far in the TeV DM mass range and improve upon previous limits by a factor 5. For the Einasto profile, the constraints reach ⟨σv⟩ values of 6×10^{-26}  cm^{3} s^{-1} in the W^{+}W^{-} channel for a DM particle mass of 1.5 TeV, and 2×10^{-26}  cm^{3} s^{-1} in the τ^{+}τ^{-} channel for a 1 TeV mass. For the first time, ground-based γ-ray observations have reached sufficient sensitivity to probe ⟨σv⟩ values expected from the thermal relic density for TeV DM particles.
    Language English
    Publishing date 2016-09-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.117.111301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Search for photon-linelike signatures from dark matter annihilations with H.E.S.S.

    Abramowski, A / Acero, F / Aharonian, F / Akhperjanian, A G / Anton, G / Balenderan, S / Balzer, A / Barnacka, A / Becherini, Y / Becker Tjus, J / Bernlöhr, K / Birsin, E / Biteau, J / Bochow, A / Boisson, C / Bolmont, J / Bordas, P / Brucker, J / Brun, F /
    Brun, P / Bulik, T / Carrigan, S / Casanova, S / Cerruti, M / Chadwick, P M / Chaves, R C G / Cheesebrough, A / Colafrancesco, S / Cologna, G / Conrad, J / Couturier, C / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / deWilt, P / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubus, G / Dutson, K / Dyks, J / Dyrda, M / Egberts, K / Eger, P / Espigat, P / Fallon, L / Farnier, C / Fegan, S / Feinstein, F / Fernandes, M V / Fernandez, D / Fiasson, A / Fontaine, G / Förster, A / Füßling, M / Gajdus, M / Gallant, Y A / Garrigoux, T / Gast, H / Giebels, B / Glicenstein, J F / Glück, B / Göring, D / Grondin, M-H / Häffner, S / Hague, J D / Hahn, J / Hampf, D / Harris, J / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hillert, A / Hinton, J A / Hofmann, W / Hofverberg, P / Holler, M / Horns, D / Jacholkowska, A / Jahn, C / Jamrozy, M / Jung, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kaufmann, S / Khélifi, B / Klepser, S / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Krayzel, F / Krüger, P P / Laffon, H / Lamanna, G / Lefaucheur, J / Lemoine-Goumard, M / Lenain, J-P / Lennarz, D / Lohse, T / Lopatin, A / Lu, C-C / Marandon, V / Marcowith, A / Masbou, J / Maurin, G / Maxted, N / Mayer, M / McComb, T J L / Medina, M C / Méhault, J / Menzler, U / Moderski, R / Mohamed, M / Moulin, E / Naumann, C L / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nguyen, N / Niemiec, J / Nolan, S J / Ohm, S / de Oña Wilhelmi, E / Opitz, B / Ostrowski, M / Oya, I / Panter, M / Parsons, R D / Paz Arribas, M / Pekeur, N W / Pelletier, G / Perez, J / Petrucci, P-O / Peyaud, B / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raue, M / Reimer, A / Reimer, O / Renaud, M / de Los Reyes, R / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Sahakian, V / Sanchez, D A / Santangelo, A / Schlickeiser, R / Schulz, A / Schwanke, U / Schwarzburg, S / Schwemmer, S / Sheidaei, F / Skilton, J L / Sol, H / Spengler, G / Stawarz, L / Steenkamp, R / Stegmann, C / Stinzing, F / Stycz, K / Sushch, I / Szostek, A / Tavernet, J-P / Terrier, R / Tluczykont, M / Trichard, C / Valerius, K / van Eldik, C / Vasileiadis, G / Venter, C / Viana, A / Vincent, P / Völk, H J / Volpe, F / Vorobiov, S / Vorster, M / Wagner, S J / Ward, M / White, R / Wierzcholska, A / Wouters, D / Zacharias, M / Zajczyk, A / Zdziarski, A A / Zech, A / Zechlin, H-S

    Physical review letters

    2013  Volume 110, Issue 4, Page(s) 41301

    Abstract: Gamma-ray line signatures can be expected in the very-high-energy (E(γ)>100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable from astrophysical γ-ray sources that in most ...

    Abstract Gamma-ray line signatures can be expected in the very-high-energy (E(γ)>100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable from astrophysical γ-ray sources that in most cases produce continuous spectra that span over several orders of magnitude in energy. Using data collected with the H.E.S.S. γ-ray instrument, upper limits on linelike emission are obtained in the energy range between ∼ 500 GeV and ∼ 25 TeV for the central part of the Milky Way halo and for extragalactic observations, complementing recent limits obtained with the Fermi-LAT instrument at lower energies. No statistically significant signal could be found. For monochromatic γ-ray line emission, flux limits of (2 × 10(-7) -2 × 10(-5)) m(-2) s(-1) sr(-1) and (1 × 10(-8) -2 × 10(-6)) m(-2) s(-1)sr(-1) are obtained for the central part of the Milky Way halo and extragalactic observations, respectively. For a DM particle mass of 1 TeV, limits on the velocity-averaged DM annihilation cross section ⟨σv⟩(χχ → γγ) reach ∼ 10(-27) cm(3)s(-1), based on the Einasto parametrization of the Galactic DM halo density profile.
    Language English
    Publishing date 2013-01-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.110.041301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Detection of Gamma Rays from a Starburst Galaxy

    Acero, F / Aharonian, F / Akhperjanian, A.G / Anton, G / Arribas, M. Paz / Bühler, R / Büsching, I / Barres de Almeida, U / Bazer-Bachi, A.R / Becherini, Y / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Borrel, V / Boutelier, T / Brucker, J / Brun, F /
    Brun, P / Bulik, T / Chadwick, P.M / Charbonnier, A / Chaves, R.C.G / Cheesebrough, A / Chounet, L.-M / Clapson, A.C / Coignet, G / Dalton, M / Daniel, M.K / Davids, I.D / de Jager, O.C / de Naurois, M / Degrange, B / Deil, C / Dickinson, H.J / Djannati-Ataï, A / Domainko, W / Drury, L. O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Förster, A / Füssling, M / Farnier, C / Fegan, S / Feinstein, F / Fiasson, A / Fontaine, G / Gérard, L / Göring, D / Gabici, S / Gallant, Y.A / Gerbig, D / Giebels, B / Glück, B / Glicenstein, J.F / Goret, P / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J.A / Hoffmann, A / Hofmann, W / Hofverberg, P / Hoppe, S / Horns, D / Jacholkowska, A / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Keogh, D / Kerschhaggl, M / Khélifi, B / Khangulyan, D / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Lamanna, G / Lenain, J.-P / Lohse, T / Méhault, J / Marandon, V / Marcowith, A / Martineau-Huynh, O / Masbou, J / Maurin, D / McComb, T.J.L / Medina, M.C / Moderski, R / Moulin, E / Naumann-Godo, M / Nedbal, D / Nekrassov, D / Nicholas, B / Niemiec, J / Nolan, S.J / Ohm, S / Olive, J.F / Orford, K.J / Ostrowski, M / Pühlhofer, G / Panter, M / Pedaletti, G / Pelletier, G / Petrucci, P.-O / Pita, S / Punch, M / Quirrenbach, A / Raubenheimer, B.C / Raue, M / Rayner, S.M / Reimer, O / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C.B / Ruppel, J / Sahakian, V / Santangelo, A / Schöck, F.M / Schlickeiser, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J.L / Sol, H / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Superina, G / Szostek, A / Tam, P.H / Tavernet, J.-P / Terrier, R / Tibolla, O / Tluczykont, M / Völk, H.J / van Eldik, C / Vasileiadis, G / Venter, C / Venter, L / Vialle, J.P / Vincent, P / Vivier, M / Volpe, F / Wagner, S.J / Ward, M / Wilhelmi, E. de Oña / Zdziarski, A.A / Zech, A

    Science. 2009 Nov. 20, v. 326, no. 5956

    2009  

    Abstract: Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10¹⁵ electron volts. We report the detection of gamma rays- ...

    Abstract Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10¹⁵ electron volts. We report the detection of gamma rays--tracers of such cosmic rays--from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H.E.S.S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 ± 1.0stat ± 2.8sys) x 10⁻¹³ cm⁻² s⁻¹, implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is five times as large as that in our Galaxy.
    Keywords energy ; gamma radiation ; image analysis ; telescopes ; tracer techniques
    Language English
    Dates of publication 2009-1120
    Size p. 1080-1082.
    Publishing place American Association for the Advancement of Science
    Document type Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1178826
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Search for a dark matter annihilation signal from the galactic center halo with H.E.S.S.

    Abramowski, A / Acero, F / Aharonian, F / Akhperjanian, A G / Anton, G / Barnacka, A / de Almeida, U Barres / Bazer-Bachi, A R / Becherini, Y / Becker, J / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Bordas, P / Borrel, V / Brucker, J / Brun, F /
    Brun, P / Bulik, T / Büsching, I / Carrigan, S / Casanova, S / Cerruti, M / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L-M / Clapson, A C / Coignet, G / Conrad, J / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Eger, P / Espigat, P / Fallon, L / Farnier, C / Fegan, S / Feinstein, F / Fernandes, M V / Fiasson, A / Fontaine, G / Förster, A / Füssling, M / Gallant, Y A / Gast, H / Gérard, L / Gerbig, D / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Göring, D / Hague, J D / Hampf, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Hofverberg, P / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jamrozy, M / Jung, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kaufmann, S / Keogh, D / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Laffon, H / Lamanna, G / Lennarz, D / Lohse, T / Lopatin, A / Lu, C-C / Marandon, V / Marcowith, A / Masbou, J / Maurin, D / Maxted, N / McComb, T J L / Medina, M C / Méhault, J / Moderski, R / Moulin, E / Naumann, C L / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nguyen, N / Nicholas, B / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / Wilhelmi, E de Oña / Opitz, B / Ostrowski, M / Panter, M / Arribas, M Paz / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raue, M / Rayner, S M / Reimer, A / Reimer, O / Renaud, M / de los Reyes, R / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Ryde, F / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schönwald, A / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Spengler, G / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Sushch, I / Szostek, A / Tavernet, J-P / Terrier, R / Tibolla, O / Tluczykont, M / Valerius, K / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Viana, A / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Vorobiov, S / Vorster, M / Wagner, S J / Ward, M / Wierzcholska, A / Zajczyk, A / Zdziarski, A A / Zech, A / Zechlin, H-S

    Physical review letters

    2011  Volume 106, Issue 16, Page(s) 161301

    Abstract: A search for a very-high-energy (VHE; ≥100  GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r∼45-150  pc from the Galactic center. The background-subtracted γ-ray spectrum measured ... ...

    Abstract A search for a very-high-energy (VHE; ≥100  GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r∼45-150  pc from the Galactic center. The background-subtracted γ-ray spectrum measured with the High Energy Stereoscopic System (H.E.S.S.) γ-ray instrument in the energy range between 300 GeV and 30 TeV shows no hint of a residual γ-ray flux. Assuming conventional Navarro-Frenk-White and Einasto density profiles, limits are derived on the velocity-weighted annihilation cross section (σv) as a function of the DM particle mass. These are among the best reported so far for this energy range and in particular differ only little between the chosen density profile parametrizations. In particular, for the DM particle mass of ∼1  TeV, values for (σv) above 3×10(-25)  cm(3) s(-1) are excluded for the Einasto density profile.
    Language English
    Publishing date 2011-04-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.106.161301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Detection of gamma rays from a starburst galaxy.

    Acero, F / Aharonian, F / Akhperjanian, A G / Anton, G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Borrel, V / Brucker, J / Brun, F / Brun, P / Bühler, R / Bulik, T / Büsching, I /
    Boutelier, T / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L-M / Clapson, A C / Coignet, G / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Farnier, C / Fegan, S / Feinstein, F / Fiasson, A / Förster, A / Fontaine, G / Füssling, M / Gabici, S / Gallant, Y A / Gérard, L / Gerbig, D / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Göring, D / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Hofverberg, P / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Lamanna, G / Lenain, J-P / Lohse, T / Marandon, V / Martineau-Huynh, O / Marcowith, A / Masbou, J / Maurin, D / McComb, T J L / Medina, M C / Méhault, J / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nicholas, B / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / de Oña Wilhelmi, E / Orford, K J / Ostrowski, M / Panter, M / Paz Arribas, M / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / Reimer, O / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Superina, G / Szostek, A / Tam, P H / Tavernet, J-P / Terrier, R / Tibolla, O / Tluczykont, M / van Eldik, C / Vasileiadis, G / Venter, C / Venter, L / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A

    Science (New York, N.Y.)

    2009  Volume 326, Issue 5956, Page(s) 1080–1082

    Abstract: Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10(15) electron volts. We report the detection of gamma rays-- ...

    Abstract Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10(15) electron volts. We report the detection of gamma rays--tracers of such cosmic rays--from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H.E.S.S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 +/- 1.0(stat) +/- 2.8(sys)) x 10(-13) cm(-2) s(-1), implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is five times as large as that in our Galaxy.
    Language English
    Publishing date 2009-11-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1178826
    Database MEDical Literature Analysis and Retrieval System OnLINE

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