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Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S

A. Abramowski 1 Fabio Acero 2 F. Aharonian 3, 4, 5 A. G. Akhperjanian 5, 6 G. Anton 7 S. Balenderan 8 Agnès Balzer 9, 10 A. Barnacka 11 Y. Becherini 12, 13 J. Becker Tjus 14 K. Bernlöhr 15, 3 E. Birsin 15 J. Biteau 12 A. Bochow 3 C. Boisson 16 J. Bolmont 17 P. Bordas 18 J. Brucker 7 F. Brun 12 P. Brun 19 T. Bulik 20 S. Carrigan 3 S. Casanova 21 M. Cerruti 16 P. M. Chadwick 8 R. C. G. Chaves 22 A. Cheesebrough 8 S. Colafrancesco 23 G. Cologna 24 J. Conrad 25 C. Couturier 26 M. Dalton 15, 27 M. K. Daniel 8 I. D. Davids 28 B. Degrange 12 C. Deil 3 P. Dewilt 29 H. J. Dickinson 25 A. Djannati-Ataï 30 W. Domainko 3 L. O'C. Drury 4 G. Dubus 31 K. Dutson 32 J. Dyks 20 M. Dyrda 33 K. Egberts 34 P. Eger 7 P. Espigat 13 L. Fallon 4 C. Farnier 25 S. Fegan 12 F. Feinstein 2 M. V. Fernandes 1 D. Fernandez 2 A. Fiasson 35 G. Fontaine 12 A. Förster 3 M. Füßling 15 M. Gajdus 15 Y. A. Gallant 2 T. Garrigoux 26 H. Gast 3 B. Giebels 12 J. F. Glicenstein 19 B. Glück 7 D. Göring 7 M. -H. Grondin 3, 36 S. Häffner 7 J. D. Hague 37 J. Hahn 3 D. Hampf 1 J. Harris 8 S. Heinz 7 G. Heinzelmann 1 G. Henri 31 G. Hermann 3 A. Hillert 3 J. A. Hinton 32 W. Hofmann 3 P. Hofverberg 3 M. Holler 10 D. Horns 1 A. Jacholkowska 17 C. Jahn 7 M. Jamrozy 38 I. Jung 7 M. A. Kastendieck 1 K. Katarzyński 39 U. Katz 40 S. Kaufmann 24 B. Khélifi 12 S. Klepser 9 D. Klochkov 41 W. Kluźniak 39 T. Kneiske 1 Nu. Komin 35 K. Kosack 19 R. Kossakowski 35 F. Krayzel 35 P. P. Krüger 3, 42 H. Laffon 12 G. Lamanna 35 J. Lefaucheur 13 M. Lemoine-Goumard 27 J. -P. Lenain 26, 13 D. Lennarz 3 T. Lohse 15 A. Lopatin 40 C. -C. Lu 3 V. Marandon 3 A. Marcowith 2 Julien Masbou 35 G. Maurin 35 N. Maxted 29 M. Mayer 10 T. J. L. Mccomb 8 M. C. Medina 19 J. Méhault 2 U. Menzler 43 R. Moderski 44 M. Mohamed 24 Emmanuel Moulin 19 C. L. Naumann 17 M. Naumann-Godo 19 M. de Naurois 12 D. Nedbal 45 D. Nekrassov 3 N. Nguyen 1 J. Niemiec 33 S. J. Nolan 8 S. Ohm 3, 32 E. de Oña Wilhelmi 3 B. Opitz 1 M. Ostrowski 38 I. Oya 15 M. Panter 3 R. D. Parsons 3 M. Paz Arribas 15 N. W. Pekeur 21 G. Pelletier 31 J. Perez 34 P. -O. Petrucci 31 B. Peyaud 19 S. Pita 13 G. Pühlhofer 41 M. Punch 13 A. Quirrenbach 24 M. Raue 1 A. Reimer 34 O. Reimer 34 M. Renaud 2 R. de Los Reyes 3 F. Rieger 3 J. Ripken 25 L. Rob 45 S. Rosier-Lees 35 G. Rowell 29 B. Rudak 20 C. B. Rulten 8 V. Sahakian 6 D. A. Sanchez 3 A. Santangelo 41 R. Schlickeiser 14 A. Schulz 9 U. Schwanke 15 S. Schwarzburg 41 S. Schwemmer 24 F. Sheidaei 13 J. L. Skilton 3 H. Sol 16 G. Spengler 15 Ł. Stawarz 38 R. Steenkamp 28 C. Stegmann 9, 10 F. Stinzing 7 K. Stycz 9 I. Sushch 15 A. Szostek 38 J. -P. Tavernet 17 R. Terrier 13 M. Tluczykont 1 C. Trichard 35 K. Valerius 40 C. van Eldik 3, 40 G. Vasileiadis 2 C. Venter 21 A. Viana 19 P. Vincent 17 H. J. Völk 3 F. Volpe 3 S. Vorobiov 2 M. Vorster 21 S. J. Wagner 36 M. Ward 8 R. White 46 A. Wierzcholska 38 D. Wouters 19 M. Zacharias 14 A. Zajczyk 2, 20 A. A. Zdziarski 20 A. Zech 16 H. -S. Zechlin 1
22 APC - Cosmologie
APC (UMR_7164) - AstroParticule et Cosmologie
30 APC - AHE - APC - Astrophysique des Hautes Energies
APC (UMR_7164) - AstroParticule et Cosmologie, Dipartimento di Astronomia, Universita degli Studi di Bologna
Abstract : Gamma-ray line signatures can be expected in the very-high-energy (VHE; E_\gamma > 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 \gamma-ray sources that in most cases produce continuous spectra which span over several orders of magnitude in energy. Using data collected with the H.E.S.S. \gamma-ray instrument, upper limits on line-like 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 \gamma-ray line emission, flux limits of (2x10^-7 - 2x10^-5) m^-2 s^-1 sr^-1 and (1x10^-8 - 2x10^-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 < \sigma v >(\chi\chi -> \gamma\gamma) reach ~10^-27 cm^3 s^-1, based on the Einasto parametrization of the Galactic DM halo density profile.
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A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, et al.. Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S. Physical Review Letters, American Physical Society, 2013, 110, pp.041301. ⟨10.1103/PhysRevLett.110.041301⟩. ⟨in2p3-00780746⟩

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