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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
- Source :
- Astrophys. J. 735, 12 (2011)
- Publication Year :
- 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.<br />Comment: 10 pages, 5 figures, 4 tables, accepted for publication in ApJ
- Subjects :
- Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Database :
- arXiv
- Journal :
- Astrophys. J. 735, 12 (2011)
- Publication Type :
- Report
- Accession number :
- edsarx.1104.2548
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/0004-637X/735/1/12