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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
Article de revue scientifique   Open Access   Avec comité de lecture

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, F. Aharonian, A. G. Akhperjanian, G. Anton, Agnès Balzer, A. Barnacka, U. Barres de Almeida, A. R. Bazer-Bachi, Y. Becherini, …
The Astrophysical Journal, Vol.735
2011
DOI: https://doi.org/10.1088/0004-637X/735/1/12

Résumé

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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