Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-09-29
JCAP 12(2010)015
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
27 pages, 5 figures, submitted to JCAP, revised version with some additions and corrections
Scientific paper
We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.
Dugger Leanna
Jeltema Tesla E.
Profumo Stefano
No associations
LandOfFree
Constraints on Decaying Dark Matter from Fermi Observations of Nearby Galaxies and Clusters 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 Constraints on Decaying Dark Matter from Fermi Observations of Nearby Galaxies and Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on Decaying Dark Matter from Fermi Observations of Nearby Galaxies and Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-241869