Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-03-14
2012, ApJ 746, 77
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
12 pages, 5 figures, 2 tables, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/746/1/77
Dwarf galaxies are widely believed to be among the best targets for indirect dark matter searches using high-energy gamma rays; and indeed gamma-ray emission from these objects has long been a subject of detailed study for ground-based atmospheric Cherenkov telescopes. Here, we update current exclusion limits obtained on the closest dwarf, the Sagittarius dwarf galaxy, in light of recent realistic dark matter halo models. The constraints on the velocity-weighted annihilation cross section of the dark matter particle are of a few 10$^{-23}$ cm$^{3}$s$^{-1}$ in the TeV energy range for a 50 h exposure. The limits are extrapolated to the sensitivities of future Cherenkov Telescope Arrays. For 200 h of observation time, the sensitivity at 95% C.L. reaches 10$^{-25}$ cm$^{3}$s$^{-1}$. Possible astrophysical backgrounds from gamma-ray sources dissembled in Sagittarius dwarf are studied. It is shown that with long-enough observation times, gamma-ray background from millisecond pulsars in a globular cluster contained within Sagittarius dwarf may limit the sensitivity to dark matter annihilations.
Brun Pierre
Glicenstein Jean-François
Kosack Karl
Medina María C.
Moulin Emmanuel
No associations
LandOfFree
Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes 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 Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-259240