Searches for gamma-ray lines and 'pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S

H. Abdalla F. Aharonian F. Ait Benkhali E.O. Angüner 1 M. Arakawa C. Arcaro C. Armand 2 M. Arrieta 3 M. Backes M. Barnard Y. Becherini J. Becker Tjus D. Berge S. Bernhard K. Bernlöhr R. Blackwell M. Böttcher C. Boisson 3 J. Bolmont 4 S. Bonnefoy P. Bordas J. Bregeon 5 F. Brun 6 P. Brun 7 M. Bryan M. Büchele T. Bulik T. Bylund M. Capasso S. Caroff 8 A. Carosi 2 S. Casanova M. Cerruti 4 N. Chakraborty S. Chandra R.C.G. Chaves 5 A. Chen S. Colafrancesco B. Condon 6 I.D. Davids C. Deil J. Devin 5 P. Dewilt L. Dirson A. Djannati-Atai 9 A. Dmytriiev 3 A. Donath V. Doroshenko L.O'C. Drury J. Dyks K. Egberts G. Emery 4 J.-P. Ernenwein 1 S. Eschbach S. Fegan 8 A. Fiasson 2 G. Fontaine 8 S. Funk M. Füßling S. Gabici 9 Y.A. Gallant 5 F. Gaté 2 G. Giavitto D. Glawion J.F. Glicenstein 7 D. Gottschall M.-H. Grondin 6 J. Hahn M. Haupt G. Heinzelmann G. Henri 10 G. Hermann J.A. Hinton W. Hofmann C. Hoischen T.L. Holch M. Holler D. Horns D. Huber H. Iwasaki A. Jacholkowska 4 M. Jamrozy D. Jankowsky F. Jankowsky L. Jouvin 9 I. Jung-Richardt M.A. Kastendieck K. Katarzyński M. Katsuragawa U. Katz D. Kerszberg 4 D. Khangulyan B. Khélifi 9 J. King S. Klepser W. Kluźniak Nu. Komin K. Kosack 7 S. Krakau M. Kraus P.P. Krüger G. Lamanna 2 J. Lau J. Lefaucheur 7 A. Lemière 9 M. Lemoine-Goumard 6 J.-P. Lenain 4 E. Leser T. Lohse M. Lorentz 7 R. López-Coto I. Lypova D. Malyshev V. Marandon A. Marcowith 5 C. Mariaud 8 G. Martí-Devesa R. Marx G. Maurin 2 P.J. Meintjes A.M.W. Mitchell R. Moderski M. Mohamed L. Mohrmann E. Moulin 7 T. Murach S. Nakashima M. de Naurois 8 H. Ndiyavala F. Niederwanger J. Niemiec L. Oakes P. O'Brien H. Odaka S. Ohm M. Ostrowski I. Oya M. Padovani 5 M. Panter R.D. Parsons C. Perennes 4 P.-O. Petrucci 10 B. Peyaud 7 Q. Piel 2 S. Pita 9 V. Poireau 2 A. Priyana Noel D.A. Prokhorov H. Prokoph G. Pühlhofer M. Punch 9 A. Quirrenbach S. Raab R. Rauth A. Reimer O. Reimer M. Renaud 5 F. Rieger L. Rinchiuso 7 C. Romoli G. Rowell B. Rudak E. Ruiz-Velasco V. Sahakian S. Saito D.A. Sanchez 2 A. Santangelo M. Sasaki R. Schlickeiser F. Schüssler 7 A. Schulz U. Schwanke S. Schwemmer M. Seglar-Arroyo 7 M. Senniappan A.S. Seyffert N. Shafi I. Shilon K. Shiningayamwe R. Simoni A. Sinha 9 H. Sol 3 F. Spanier A. Specovius M. Spir-Jacob 9 L. Stawarz R. Steenkamp C. Stegmann C. Steppa T. Takahashi J.-P. Tavernet 4 T. Tavernier 7 A.M. Taylor R. Terrier 9 L. Tibaldo D. Tiziani M. Tluczykont C. Trichard 8 M. Tsirou 5 N. Tsuji R. Tuffs Y. Uchiyama D.J. van der Walt C. van Eldik C. van Rensburg B. van Soelen G. Vasileiadis 5 J. Veh C. Venter A. Viana P. Vincent 4 J. Vink F. Voisin H.J. Völk T. Vuillaume 2 Z. Wadiasingh S.J. Wagner R.M. Wagner R. White A. Wierzcholska R. Yang D. Zaborov 8 M. Zacharias R. Zanin A.A. Zdziarski A. Zech 3 F. Zefi 8 A. Ziegler J. Zorn N. Żywucka M. Cirelli 11 P. Panci F. Sala 11 J. Silk 12 M. Taoso
Abstract : Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure WIMP multiplets that, annihilating into all electroweak bosons, produce a distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and a lower-energy continuum. For case i), upper limits at 95% confidence level of about  σ v   3 × 10−25 cm3 s−1 are obtained in the mass range of 400 GeV to 1 TeV. For case ii), the full spectral shape of the models is used and several excluded regions are identified, but the thermal masses of the candidates are not robustly ruled out.
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Submitted on : Tuesday, October 16, 2018 - 11:45:03 PM
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H. Abdalla, F. Aharonian, F. Ait Benkhali, E.O. Angüner, M. Arakawa, et al.. Searches for gamma-ray lines and 'pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S. JCAP, 2018, 11 (11), pp.037. ⟨10.1088/1475-7516/2018/11/037⟩. ⟨hal-01897209⟩

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