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

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arxiv 1301.1173 v1 pith:RY3JZSQ7 submitted 2013-01-07 astro-ph.HE

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

H.E.S.S. Collaboration: A. Abramowski , F. Acero , F. Aharonian , A.G. Akhperjanian , G. Anton , S. Balenderan , A. Balzer , A. Barnacka
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Y. Becherini J. Becker Tjus K. Bernl\"ohr E. Birsin J. Biteau A. Bochow C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun P. Brun T. Bulik S. Carrigan S. Casanova M. Cerruti P.M. Chadwick R.C.G. Chaves A. Cheesebrough S. Colafrancesco G. Cologna J. Conrad C. Couturier M. Dalton M.K. Daniel I.D. Davids B. Degrange C. Deil P. deWilt H.J. Dickinson A. Djannati-Ata\"i W. Domainko L.O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat L. Fallon C. Farnier S. Fegan F. Feinstein M.V. Fernandes D. Fernandez A. Fiasson G. Fontaine A. F\"orster M. F\"u{\ss}ling M. Gajdus Y.A. Gallant T. Garrigoux H. Gast B. Giebels J.F. Glicenstein B. Gl\"uck D. G\"oring M.-H. Grondin S. H\"affner J.D. Hague J. Hahn D. Hampf J. Harris S. Heinz G. Heinzelmann G. Henri G. Hermann A. Hillert J.A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska C. Jahn M. Jamrozy I. Jung M.A. Kastendieck K. Katarzy\'nski U. Katz S. Kaufmann B. Kh\'elifi S. Klepser D. Klochkov W. Klu\'zniak T. Kneiske Nu. Komin K. Kosack R. Kossakowski F. Krayzel P.P. Kr\"uger H. Laffon G. Lamanna J. Lefaucheur M. Lemoine-Goumard J.-P. Lenain D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon A. Marcowith J. Masbou G. Maurin N. Maxted M. Mayer T.J.L. McComb M.C. Medina J. M\'ehault U. Menzler R. Moderski M. Mohamed E. Moulin C.L. Naumann M. Naumann-Godo M. de Naurois D. Nedbal D. Nekrassov N. Nguyen J. Niemiec S.J. Nolan S. Ohm E. de O\~na Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter R.D. Parsons M. Paz Arribas N.W. Pekeur G. Pelletier J. Perez P.-O. Petrucci B. Peyaud S. Pita G. P\"uhlhofer M. Punch A. Quirrenbach M. Raue A. Reimer O. Reimer M. Renaud R. de los Reyes F. Rieger J. Ripken L. Rob S. Rosier-Lees G. Rowell B. Rudak C.B. Rulten V. Sahakian D.A. Sanchez A. Santangelo R. Schlickeiser A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer F. Sheidaei J.L. Skilton H. Sol G. Spengler {\L}. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J.-P. Tavernet R. Terrier M. Tluczykont C. Trichard K. Valerius C. van Eldik G. Vasileiadis C. Venter A. Viana P. Vincent H.J. V\"olk F. Volpe S. Vorobiov M. Vorster S.J. Wagner M. Ward R. White A. Wierzcholska D. Wouters M. Zacharias A. Zajczyk A.A. Zdziarski A. Zech H.-S. Zechlin
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classification astro-ph.HE
keywords gamma-raylimitsgammahaloobtainedcentraldarkemission
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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