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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

A. Abramowski Fabio Acero 1 F. Aharonian A. G. Akhperjanian G. Anton Agnès Balzer A. Barnacka 2 U. Barres de Almeida A. R. Bazer-Bachi 3 Y. Becherini 4, 5 J. Becker B. Behera K. Bernlöhr A. Bochow C. Boisson 6 J. Bolmont 7 P. Bordas V. Borrel 3 J. Brucker F. Brun 4 P. Brun 2 T. Bulik I. Büsching S. Carrigan S. Casanova M. Cerruti 6 P. M. Chadwick A. Charbonnier 7 R. C. G. Chaves A. Cheesebrough L. -M. Chounet 4 A. C. Clapson G. Coignet 8 J. Conrad M. Dalton M. K. Daniel I. D. Davids B. Degrange 4 C. Deil H. J. Dickinson A. Djannati-Ataï 9 W. Domainko L. O'C. Drury F. Dubois 8 G. Dubus 10 J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat 5 L. Fallon C. Farnier 1 S. Fegan 4 F. Feinstein 1 M. V. Fernandes A. Fiasson 8 G. Fontaine 4 A. Förster M. Füßling Y. A. Gallant 1 H. Gast L. Gérard 5 D. Gerbig B. Giebels 4 J. F. Glicenstein 2 B. Glück P. Goret 2 D. Göring S. Häffner J. D. Hague D. Hampf M. Hauser S. Heinz G. Heinzelmann G. Henri 10 G. Hermann J. A. Hinton A. Hoffmann W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska 7 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 4 D. Klochkov W. Kluzniak T. Kneiske Nu. Komin 8 K. Kosack 2 R. Kossakowski 8 H. Laffon 4 G. Lamanna 8 D. Lennarz T. Löhse A. Lopatin C. -C. Lu V. Marandon 5 A. Marcowith 1 J. Masbou 8 D. Maurin 7 N. Maxted T. J. L. Mccomb M. C. Medina 2 J. Méhault 1 R. Moderski Emmanuel Moulin 2 C. L. Naumann 7 M. Naumann-Godo 2 M. de Naurois 4 D. Nedbal D. Nekrassov N. Nguyen B. Nicholas J. Niemiec S. J. Nolan S. Ohm J-P. Olive 3 E. de Oña Wilhelmi B. Opitz M. Ostrowski M. Panter M. Paz Arribas G. Pedaletti G. Pelletier 10 P. -O. Petrucci 10 S. Pita 5 G. Pühlhofer M. Punch 5 A. Quirrenbach M. Raue S. M. Rayner A. Reimer O. Reimer M. Renaud 1 R. de Los Reyes F. Rieger J. Ripken L. Rob S. Rosier-Lees 8 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 6 G. Spengle L. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek 10 J. -P. Tavernet 7 R. Terrier 5 O. Tibolla M. Tluczykont K. Valerius C. van Eldik G. Vasileiadis 1 C. Venter J. P. Vialle 8 A. Viana 2 P. Vincent 7 M. Vivier 2 H. J. Völk F. Volpe S. Vorobiov 1 M. Vorster S. J. Wagner M. Ward A. Wierzcholska M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech 6 H. -S. Zechlin
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.
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Submitted on : Friday, May 6, 2011 - 4:30:31 PM
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A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, et al.. H.E.S.S. observations of the globular clusters NGC 6388 and M 15 and search for a Dark Matter signal. The Astrophysical Journal, American Astronomical Society, 2011, 735, pp.12. ⟨10.1088/0004-637X/735/1/12⟩. ⟨in2p3-00591116⟩

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