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24 April 2024

» arxiv » 1104.2548

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H.E.S.S. observations of the globular clusters NGC 6388 and M 15 and search for a Dark Matter signal
HESS Collaboration ; A. Abramowski ; F. Acero ; F. Aharonian ; A.G. Akhperjanian ; G. Anton ; A. Balzer ; A. Barnacka ; U. Barres de Almeida ; A.R. Bazer-Bachi ; Y. Becherini ; J. Becker ; B. Behera ; K. Bernlöhr ; A. Bochow ; C. Boisson ; J. Bolmont ; P. Bordas ; V. Borrel ; J. Brucker ; F. Brun ; P. Brun ; T. Bulik ; I. Büsching ; S. Carrigan ; S. Casanova ; M. Cerruti ; P.M. Chadwick ; A. Charbonnier ; R.C.G. Chaves ; A. Cheesebrough ; L.-M. Chounet ; A.C. Clapson ; G. Coignet ; J. Conrad ; M. Dalton ; M.K. Daniel ; I.D. Davids ; B. Degrange ; C. Deil ; H.J. Dickinson ; A. Djannati-Ataï ; W. Domainko ; L.O'C. Drury ; F. Dubois ; G. Dubus ; J. Dyks ; M. Dyrda ; K. Egberts ; P. Eger ; P. Espigat ; L. Fallon ; C. Farnier ; S. Fegan ; F. Feinstein ; M.V. Fernandes ; A. Fiasson ; G. Fontaine ; A. Förster ; M. Füßling ; Y.A. Gallant ; H. Gast ; L. Gérard ; D. Gerbig ; B. Giebels ; J.F. Glicenstein ; B. Glück ; P. Goret ; D. Göring ; S. Häffner ; J.D. Hague ; D. Hampf ; M. Hauser ; S. Heinz ; G. Heinzelmann ; G. Henri ; G. Hermann ; J.A. Hinton ; A. Hoffmann ; W. Hofmann ; P. Hofverberg ; M. Holler ; D. Horns ; A. Jacholkowska ; O.C. de Jager ; C. Jahn ; M. Jamrozy ; I. Jung ; M.A. Kastendieck ; K. Katarzynski ; U. Katz ; S. Kaufmann ; D. Keogh ; D. Khangulyan ; B. Khélifi ; D. Klochkov ; W. Kluzniak ; T. Kneiske ; Nu. Komin ; K. Kosack ; R. Kossakowski ; H. Laffon ; G. Lamanna ; D. Lennarz ; T. Löhse ; A. Lopatin ; C.-C. Lu ; V. Marandon ; A. Marcowith ; J. Masbou ; D. Maurin ; N. Maxted ; T.J.L. McComb ; M.C. Medina ; J. Méhault ; R. Moderski ; E. Moulin ; C.L. Naumann ; M. Naumann-Godo ; M. de Naurois ; D. Nedbal ; D. Nekrassov ; N. Nguyen ; B. Nicholas ; J. Niemiec ; S.J. Nolan ; S. Ohm ; J-P. Olive ; E. de Oña Wilhelmi ; B. Opitz ; M. Ostrowski ; M. Panter ; M. Paz Arribas ; G. Pedaletti ; G. Pelletier ; P.-O. Petrucci ; S. Pita ; G. Pühlhofer ; M. Punch ; A. Quirrenbach ; M. Raue ; S.M. Rayner ; 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 ; J. Ruppel ; F. Ryde ; V. Sahakian ; A. Santangelo ; R. Schlickeiser ; F.M. Schöck ; A. Schulz ; U. Schwanke ; S. Schwarzburg ; S. Schwemmer ; M. Sikora ; J.L. Skilton ; H. Sol ; G. Spengle ; L. Stawarz ; R. Steenkamp ; C. Stegmann ; F. Stinzing ; K. Stycz ; I. Sushch ; A. Szostek ; J.-P. Tavernet ; R. Terrier ; O. Tibolla3 ; M. Tluczykont ; K. Valerius ; C. van Eldik ; G. Vasileiadis ; C. Venter ; J.P. Vialle ; A. Viana ; P. Vincent ; M. Vivier ; H.J. Völk ; F. Volpe ; S. Vorobiov ; M. Vorster ; S.J. Wagner ; M. Ward ; A. Wierzcholska ; M. Zacharias ; A. Zajczyk ; A.A. Zdziarski ; A. Zech ; H.-S. Zechlin ;
Date:	13 Apr 2011
Abstract:	Observations of the globular clusters NGC 6388 and M 15 were carried out by the H.E.S.S. array of Cherenkov telescopes for a live time of 27.2 and 15.2 hours respectively. No gamma-ray signal is found at the nominal target position of NGC 6388 and M 15. In the primordial formation scenario, globular clusters are formed in a dark matter halo and dark matter could still be present in the baryon-dominated environment of globular clusters. This opens the possibility of observing a dark matter self-annihilation signal. The dark matter content of the globular clusters NGC 6388 and M 15 is modelled taking into account the astrophysical processes that can be expected to influence the dark matter distribution during the evolution of the globular cluster: the adiabatic contraction of dark matter by baryons, the adiabatic growth of a black hole in the dark matter halo and the kinetic heating of dark matter by stars. 95% confidence level exclusion limits on the dark matter particle velocity-weighted annihilation cross section are derived for these dark matter haloes. In the TeV range, the limits on the velocity-weighted annihilation cross section are derived at the 10-25 cm3 s-1 level and a few 10-24 cm3 s-1 for NGC 6388 and M 15 respectively.
Source:	arXiv, 1104.2548
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