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  1. Article ; Online: Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433.

    Aharonian, F / Benkhali, F Ait / Aschersleben, J / Ashkar, H / Backes, M / Martins, V Barbosa / Batzofin, R / Becherini, Y / Berge, D / Bernlöhr, K / Bi, B / Böttcher, M / Boisson, C / Bolmont, J / de Lavergne, M de Bony / Borowska, J / Bouyahiaoui, M / Breuhaus, M / Brose, R /
    Brown, A M / Brun, F / Bruno, B / Bulik, T / Burger-Scheidlin, C / Caroff, S / Casanova, S / Cecil, R / Celic, J / Cerruti, M / Chand, T / Chandra, S / Chen, A / Chibueze, J / Chibueze, O / Cotter, G / Dai, S / Mbarubucyeye, J Damascene / Djannati-Ataï, A / Dmytriiev, A / Doroshenko, V / Egberts, K / Einecke, S / Ernenwein, J-P / Filipovic, M / Fontaine, G / Füßling, M / Funk, S / Gabici, S / Ghafourizadeh, S / Giavitto, G / Glawion, D / Glicenstein, J-F / Grolleron, G / Haerer, L / Hinton, J A / Hofmann, W / Holch, T L / Holler, M / Horns, D / Jamrozy, M / Jankowsky, F / Jardin-Blicq, A / Joshi, V / Jung-Richardt, I / Kasai, E / Katarzyński, K / Khatoon, R / Khélifi, B / Klepser, S / Kluźniak, W / Komin, Nu / Kosack, K / Kostunin, D / Kundu, A / Lang, R G / Le Stum, S / Leitl, F / Lemière, A / Lenain, J-P / Leuschner, F / Lohse, T / Luashvili, A / Lypova, I / Mackey, J / Malyshev, D / Marandon, V / Marchegiani, P / Marcowith, A / Martí-Devesa, G / Marx, R / Mehta, A / Mitchell, A / Moderski, R / Mohrmann, L / Montanari, A / Moulin, E / Murach, T / Nakashima, K / de Naurois, M / Niemiec, J / Noel, A Priyana / Ohm, S / Olivera-Nieto, L / de Ona Wilhelmi, E / Ostrowski, M / Panny, S / Panter, M / Parsons, R D / Peron, G / Prokhorov, D A / Pühlhofer, G / Punch, M / Quirrenbach, A / Reichherzer, P / Reimer, A / Reimer, O / Ren, H / Renaud, M / Reville, B / Rieger, F / Rowell, G / Rudak, B / Ricarte, H Rueda / Ruiz-Velasco, E / Sahakian, V / Salzmann, H / Santangelo, A / Sasaki, M / Schäfer, J / Schüssler, F / Schwanke, U / Shapopi, J N S / Sol, H / Specovius, A / Spencer, S / Stawarz, L / Steenkamp, R / Steinmassl, S / Steppa, C / Streil, K / Sushch, I / Suzuki, H / Takahashi, T / Tanaka, T / Taylor, A M / Terrier, R / Tsirou, M / Tsuji, N / Unbehaun, T / van Eldik, C / Vecchi, M / Veh, J / Venter, C / Vink, J / Wach, T / Wagner, S J / Werner, F / White, R / Wierzcholska, A / Wong, Yu Wun / Zacharias, M / Zargaryan, D / Zdziarski, A A / Zech, A / Zouari, S / Żywucka, N

    Science (New York, N.Y.)

    2024  Volume 383, Issue 6681, Page(s) 402–406

    Abstract: SS 433 is a microquasar, a stellar binary system that launches collimated relativistic jets. We observed SS 433 in gamma rays using the High Energy Stereoscopic System (H.E.S.S.) and found an energy-dependent shift in the apparent position of the gamma- ... ...

    Abstract SS 433 is a microquasar, a stellar binary system that launches collimated relativistic jets. We observed SS 433 in gamma rays using the High Energy Stereoscopic System (H.E.S.S.) and found an energy-dependent shift in the apparent position of the gamma-ray emission from the parsec-scale jets. These observations trace the energetic electron population and indicate that inverse Compton scattering is the emission mechanism of the gamma rays. Our modeling of the energy-dependent gamma-ray morphology constrains the location of particle acceleration and requires an abrupt deceleration of the jet flow. We infer the presence of shocks on either side of the binary system, at distances of 25 to 30 parsecs, and that self-collimation of the precessing jets forms the shocks, which then efficiently accelerate electrons.
    Language English
    Publishing date 2024-01-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.adi2048
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi.

    Aharonian, F / Ait Benkhali, F / Angüner, E O / Ashkar, H / Backes, M / Baghmanyan, V / Barbosa Martins, V / Batzofin, R / Becherini, Y / Berge, D / Bernlöhr, K / Bi, B / Böttcher, M / Boisson, C / Bolmont, J / de Bony de Lavergne, M / Breuhaus, M / Brose, R / Brun, F /
    Caroff, S / Casanova, S / Cerruti, M / Chand, T / Chen, A / Cotter, G / Damascene Mbarubucyeye, J / Djannati-Ataï, A / Dmytriiev, A / Doroshenko, V / Duffy, C / Egberts, K / Ernenwein, J-P / Fegan, S / Feijen, K / Fiasson, A / Fichet de Clairfontaine, G / Fontaine, G / Füßling, M / Funk, S / Gabici, S / Gallant, Y A / Ghafourizadeh, S / Giavitto, G / Giunti, L / Glawion, D / Glicenstein, J F / Grondin, M-H / Hermann, G / Hinton, J A / Hörbe, M / Hofmann, W / Hoischen, C / Holch, T L / Holler, M / Horns, D / Huang, Zhiqiu / Jamrozy, M / Jankowsky, F / Jung-Richardt, I / Kasai, E / Katarzyński, K / Katz, U / Khangulyan, D / Khélifi, B / Klepser, S / Kluźniak, W / Komin, Nu / Konno, R / Kosack, K / Kostunin, D / Le Stum, S / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Leuschner, F / Lohse, T / Luashvili, A / Lypova, I / Mackey, J / Malyshev, D / Marandon, V / Marchegiani, P / Marcowith, A / Martí-Devesa, G / Marx, R / Maurin, G / Meyer, M / Mitchell, A / Moderski, R / Mohrmann, L / Montanari, A / Moulin, E / Muller, J / Murach, T / Nakashima, K / de Naurois, M / Nayerhoda, A / Niemiec, J / Priyana Noel, A / O'Brien, P / Ohm, S / Olivera-Nieto, L / de Ona Wilhelmi, E / Ostrowski, M / Panny, S / Panter, M / Parsons, R D / Peron, G / Pita, S / Poireau, V / Prokhorov, D A / Prokoph, H / Pühlhofer, G / Punch, M / Quirrenbach, A / Reichherzer, P / Reimer, A / Reimer, O / Renaud, M / Reville, B / Rieger, F / Rowell, G / Rudak, B / Rueda Ricarte, H / Ruiz-Velasco, E / Sahakian, V / Sailer, S / Salzmann, H / Sanchez, D A / Santangelo, A / Sasaki, M / Schäfer, J / Schüssler, F / Schutte, H M / Schwanke, U / Senniappan, M / Shapopi, J N S / Simoni, R / Sinha, A / Sol, H / Specovius, A / Spencer, S / Stawarz, Ł / Steinmassl, S / Steppa, C / Takahashi, T / Tanaka, T / Taylor, A M / Terrier, R / Thorpe-Morgan, C / Tsirou, M / Tsuji, N / Tuffs, R / Uchiyama, Y / Unbehaun, T / van Eldik, C / van Soelen, B / Veh, J / Venter, C / Vink, J / Wagner, S J / Werner, F / White, R / Wierzcholska, A / Wong, Yu Wun / Yusafzai, A / Zacharias, M / Zargaryan, D / Zdziarski, A A / Zech, A / Zhu, S J / Zouari, S / Żywucka, N

    Science (New York, N.Y.)

    2022  Volume 376, Issue 6588, Page(s) 77–80

    Abstract: Recurrent novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to the accretion of fresh material from a binary companion. The shock generated when ejected material slams into the companion star's wind can accelerate ... ...

    Abstract Recurrent novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to the accretion of fresh material from a binary companion. The shock generated when ejected material slams into the companion star's wind can accelerate particles. We report very-high-energy (VHE; [Formula: see text]) gamma rays from the recurrent nova RS Ophiuchi, up to 1 month after its 2021 outburst, observed using the High Energy Stereoscopic System (H.E.S.S.). The temporal profile of VHE emission is similar to that of lower-energy giga-electron volt emission, indicating a common origin, with a 2-day delay in peak flux. These observations constrain models of time-dependent particle energization, favoring a hadronic emission scenario over the leptonic alternative. Shocks in dense winds provide favorable environments for efficient acceleration of cosmic rays to very high energies.
    Language English
    Publishing date 2022-03-10
    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.abn0567
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. 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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  4. 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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  5. 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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  6. 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
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  7. 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
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  8. 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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