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  1. 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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  2. 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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  3. 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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  4. Article ; Online: Fast variability of tera-electron volt gamma rays from the radio galaxy M87.

    Aharonian, F / Akhperjanian, A G / Bazer-Bachi, A R / Beilicke, M / Benbow, W / Berge, D / Bernlöhr, K / Boisson, C / Bolz, O / Borrel, V / Braun, I / Brown, A M / Bühler, R / Büsching, I / Carrigan, S / Chadwick, P M / Chounet, L-M / Coignet, G / Cornils, R /
    Costamante, L / Degrange, B / Dickinson, H J / Djannati-Ataï, A / Drury, L O'c / Dubus, G / Egberts, K / Emmanoulopoulos, D / Espigat, P / Feinstein, F / Ferrero, E / Fiasson, A / Fontaine, G / Funk, Seb / Funk, S / Füssling, M / Gallant, Y A / Giebels, B / Glicenstein, J F / Goret, P / Hadjichristidis, C / Hauser, D / Hauser, M / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Kendziorra, E / Kerschhaggl, M / Khélifi, B / Komin, Nu / Konopelko, A / Kosack, K / Lamanna, G / Latham, I J / Le Gallou, R / Lemière, A / Lemoine-Goumard, M / Lenain, J-P / Lohse, T / Martin, J M / Martineau-Huynh, O / Marcowith, A / Masterson, C / Maurin, G / McComb, T J L / Moulin, E / de Naurois, M / Nedbal, D / Nolan, S J / Noutsos, A / Orford, K J / Osborne, J L / Ouchrif, M / Panter, M / Pelletier, G / Pita, S / Pühlhofer, G / Punch, M / Ranchon, S / Raubenheimer, B C / Raue, M / Rayner, S M / Reimer, A / Ripken, J / Rob, L / Rolland, L / Rosier-Lees, S / Rowell, G / Sahakian, V / Santangelo, A / Saugé, L / Schlenker, S / Schlickeiser, R / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sol, H / Spangler, D / Spanier, F / Steenkamp, R / Stegmann, C / Superina, G / Tam, P H / Tavernet, J-P / Terrier, R / Tluczykont, M / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Vincent, P / Völk, H J / Wagner, S J / Ward, M

    Science (New York, N.Y.)

    2006  Volume 314, Issue 5804, Page(s) 1424–1427

    Abstract: The detection of fast variations of the tera-electron volt (TeV) (10(12) eV) gamma-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times as fast as those observed in any other wave band and ... ...

    Abstract The detection of fast variations of the tera-electron volt (TeV) (10(12) eV) gamma-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times as fast as those observed in any other wave band and imply a very compact emission region with a dimension similar to the Schwarzschild radius of the central black hole. We thus can exclude several other sites and processes of the gamma-ray production. The observations confirm that TeV gamma rays are emitted by extragalactic sources other than blazars, where jets are not relativistically beamed toward the observer.
    Language English
    Publishing date 2006-12-01
    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.1134408
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. 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
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  6. Article: Energy spectrum of cosmic-ray electrons at TeV energies.

    Aharonian, F / Akhperjanian, A G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Benbow, W / Bernlöhr, K / Boisson, C / Bochow, A / Borrel, V / Braun, I / Brion, E / Brucker, J / Brun, P / Brucker, R / Bulik, T / Büsching, I / Boutelier, T /
    Carrigan, S / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L M / Clapson, A C / Coignet, G / Costamante, L / Dalton, 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 / Farnier, C / Feinstein, F / Fiasson, A / Fontaine, G / Füsling, M / Gabici, S / Gallant, Y A / Gérard, L / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Hadjichristidis, C / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jung, I / Katarzyński, K / Kaufmann, S / Kendziorra, E / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Komin, Nu / Kosack, K / Lamanna, G / Lenain, J P / Lohse, T / Marandon, V / Martin, J M / Martineau-Huynh, O / Marcowith, A / Maurin, D / McComb, T J L / Medina, C / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Niemiec, J / Nolan, S J / Ohm, S / Olive, J F / de Oña Wilhelmi, E / Orford, K J / Osborne, J L / Ostrowski, M / Panter, M / Pedaletti, G / Pelletier, G / Petrucci, P O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / 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 / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Skilton, J L / Sol, H / Spangler, D / Stawarz, Ł / Steenkamp, R / Stegmann, C / Superina, G / Tam, P H / Tavernet, J P / Terrier, R / Tibolla, O / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A

    Physical review letters

    2008  Volume 101, Issue 26, Page(s) 261104

    Abstract: The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the electron spectrum ...

    Abstract The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the electron spectrum derived from data taken with the High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes. In this measurement, the first of this type, we are able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements. We find evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
    Language English
    Publishing date 2008-12-31
    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.101.261104
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  7. Article: Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304.

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

    Physical review letters

    2008  Volume 101, Issue 17, Page(s) 170402

    Abstract: In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent ... ...

    Abstract In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this Letter a search for such time lags during the High Energy Stereoscopic System observations of the exceptional very high energy flare of the active galaxy PKS 2155-304 on 28 July 2006 is presented. Since no significant time lag is found, lower limits on the energy scale of speed of light modifications are derived.
    Language English
    Publishing date 2008-10-24
    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.101.170402
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  8. Article: Fast Variability of Tera-Electron Volt γ Rays from the Radio Galaxy M87

    Aharonian, F / Akhperjanian, A.G / Bazer-Bachi, A.R / Beilicke, M / Benbow, W / Berge, D / Bernlöhr, K / Boisson, C / Bolz, O / Borrel, V / Braun, I / Brown, A.M / Bühler, R / Büsching, I / Carrigan, S / Chadwick, P.M / Chounet, L.-M / Coignet, G / Cornils, R /
    Costamante, L / de Jager, O.C / Degrange, B / Dickinson, H.J / Djannati-Ataï, A / Drury, L. O'C / Dubus, G / Egberts, K / Eldik, C. van / Emmanoulopoulos, D / Espigat, P / Feinstein, F / Ferrero, E / Fiasson, A / Fontaine, G / Füssling, M / Funk, S / Funk, Seb / Gallant, Y.A / Giebels, B / Glicenstein, J.F / Goret, P / Hadjichristidis, C / Hauser, D / Hauser, M / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J.A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / Kendziorra, E / Kerschhaggl, M / Khélifi, B / Komin, Nu / Konopelko, A / Kosack, K / Lamanna, G / Latham, I.J / Le Gallou, R / Lemière, A / Lemoine-Goumard, M / Lenain, J.-P / Lohse, T / Marcowith, A / Martin, J.M / Martineau-Huynh, O / Masterson, C / Maurin, G / McComb, T.J.L / Moulin, E / Naurois, M. de / Nedbal, D / Nolan, S.J / Noutsos, A / Orford, K.J / Osborne, J.L / Ouchrif, M / Panter, M / Pelletier, G / Pita, S / Pühlhofer, G / Punch, M / Ranchon, S / Raubenheimer, B.C / Raue, M / Rayner, S.M / Reimer, A / Ripken, J / Rob, L / Rolland, L / Rosier-Lees, S / Rowell, G / Sahakian, V / Santangelo, A / Saugé, L / Schlenker, S / Schlickeiser, R / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sol, H / Spangler, D / Spanier, F / Steenkamp, R / Stegmann, C / Superina, G / Tam, P.H / Tavernet, J.-P / Terrier, R / Tluczykont, M / Vasileiadis, G / Venter, C / Vialle, J.P / Vincent, P / Völk, H.J / Wagner, S.J / Ward, M

    Science. 2006 Dec. 1, v. 314, no. 5804

    2006  

    Abstract: The detection of fast variations of the tera-electron volt (TeV) (10¹² eV) γ-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times as fast as those observed in any other wave band and imply ...

    Abstract The detection of fast variations of the tera-electron volt (TeV) (10¹² eV) γ-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times as fast as those observed in any other wave band and imply a very compact emission region with a dimension similar to the Schwarzschild radius of the central black hole. We thus can exclude several other sites and processes of the γ-ray production. The observations confirm that TeV γ rays are emitted by extragalactic sources other than blazars, where jets are not relativistically beamed toward the observer.
    Keywords detection ; gamma radiation
    Language English
    Dates of publication 2006-1201
    Size p. 1424-1427.
    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.1134408
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  9. 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
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  10. Article ; Online: Radio imaging of the very-high-energy gamma-ray emission region in the central engine of a radio galaxy.

    Acciari, V A / Aliu, E / Arlen, T / Bautista, M / Beilicke, M / Benbow, W / Bradbury, S M / Buckley, J H / Bugaev, V / Butt, Y / Byrum, K / Cannon, A / Celik, O / Cesarini, A / Chow, Y C / Ciupik, L / Cogan, P / Cui, W / Dickherber, R /
    Fegan, S J / Finley, J P / Fortin, P / Fortson, L / Furniss, A / Gall, D / Gillanders, G H / Grube, J / Guenette, R / Gyuk, G / Hanna, D / Holder, J / Horan, D / Hui, C M / Humensky, T B / Imran, A / Kaaret, P / Karlsson, N / Kieda, D / Kildea, J / Konopelko, A / Krawczynski, H / Krennrich, F / Lang, M J / LeBohec, S / Maier, G / McCann, A / McCutcheon, M / Millis, J / Moriarty, P / Ong, R A / Otte, A N / Pandel, D / Perkins, J S / Petry, D / Pohl, M / Quinn, J / Ragan, K / Reyes, L C / Reynolds, P T / Roache, E / Rose, H J / Schroedter, M / Sembroski, G H / Smith, A W / Swordy, S P / Theiling, M / Toner, J A / Varlotta, A / Vincent, S / Wakely, S P / Ward, J E / Weekes, T C / Weinstein, A / Williams, D A / Wissel, S / Wood, M / Walker, R C / Davies, F / Hardee, P E / Junor, W / Ly, C / 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 / 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 / Göhring, D / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Kendziorra, E / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Lamanna, G / Lenain, J-P / Lohse, T / Marandon, V / Martin, J M / Martineau-Huynh, O / Marcowith, A / Maurin, D / McComb, T J L / Medina, M C / 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 / 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 / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Spangler, D / 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, 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    Science (New York, N.Y.)

    2009  Volume 325, Issue 5939, Page(s) 444–448

    Abstract: The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10(12) electron volts and are bright sources of ... ...

    Abstract The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10(12) electron volts and are bright sources of very-high-energy (VHE) gamma-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy Messier 87, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.
    Language English
    Publishing date 2009-07-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1175406
    Database MEDical Literature Analysis and Retrieval System OnLINE

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