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Article overview
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Dark matter search in the inner galactic center halo with H.E.S.S | V. Lefranc
; E. Moulin for the H.E.S.S. collaboration
; | Date: |
2 Sep 2016 | Abstract: | The presence of dark matter in the universe is nowadays supported by a
substantial set of astronomical and cosmological observations. A large amount
of dark matter is expected in the Galactic Center (GC) region. Thanks also to
its proximity, it is one of the best targets to look for dark matter particle
self-annihilation into very high energy gamma-rays. We perform a search for
annihilating dark matter in the central 300 parsecs around the GC with the
H.E.S.S. array of ground-based Cherenkov telescopes. Using the full H.E.S.S.- I
dataset (2004-2014) of GC observations, new constraints are derived on the
velocity-weighted annihilation cross section $langle sigma v
angle$ with a
2D likelihood method using spectral and spatial morphologies of the DM signal
compared to background. These constraints are the strongest obtained so far in
the TeV mass range and improve the previous constraints by a factor of 5.
Considering an Einasto profile, the constraints reach $langle sigma v
angle$ values of $6 imes 10^{-26}$cm$^{3}$s$^{-1}$ for a DM particle mass of
1.5 TeV annihilation into W$^+$W$^-$ pairs. In the $ au^+ au^-$ channel, the
constraints probe the natural scale for thermal relic cross section for DM
particles of masses between 400 GeV and 2 TeV. | Source: | arXiv, 1608.8453 | Services: | Forum | Review | PDF | Favorites |
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