Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-12-27
Astroparticle Physics 34 (2011) 608
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Accepted for publication on Astroparticle Physics, 25 pages, 12 figures
Scientific paper
10.1016/j.astropartphys.2010.12.
The Sculptor and Carina Dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total of 11.8 and 14.8 hours of high quality data, respectively. No gamma-ray signal was detected at the nominal positions of these galaxies above 220 GeV and 320 GeV, respectively. Upper limits on the gamma-ray fluxes at 95% C.L. assuming two forms for the spectral energy distribution (a power law shape and one derived from dark matter annihilation) are obtained at the level of 10^-13 to 10^-12 cm^-2s^-1 in the TeV range. Constraints on the velocity weighted dark matter particle annihilation cross section for both Sculptor and Carina dwarf galaxies range from <\sigma v> ~ 10^-21 cm^3s^-1 down to <\sigma v> ~ 10^-22 cm^3s^-1 depending on the dark matter halo model used. Possible enhancements of the gamma-ray flux are studied: the Sommerfeld effect, which is found to exclude some dark matter particle masses, the internal Bremsstrahlung and clumps in the dark-matter halo distributions.
Abramowski Andrzej
Acero Fabio
Aharonian Felix
Akhperjanian A. G.
Anton Gisela
No associations
LandOfFree
H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-22697