Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-08-30
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Revised version. Numerical factors and typos corrected. Results have changed but the conclusions remain unchanged. 12p; 12 Fig
Scientific paper
We update our earlier calculations of gamma ray and radio observational constraints on annihilations of dark matter particles lighter than 10 GeV. We predict the synchrotron spectrum as well as the morphology of the radio emission associated with light decaying and annihilating dark matter candidates in both the Coma cluster and the Galactic Centre. Our new results basically confirm our previous findings: synchrotron emission in the very inner part of the Milky Way constrains or even excludes dark matter candidates if the magnetic field is larger than 50 micro Gauss. In fact, our results suggest that light annihilating candidates must have a S-wave suppressed pair annihilation cross section into electrons (or the branching ratio into electron positron must be small). If dark matter is decaying, it must have a life time that is larger than t = 3. 10^{25} s. Therefore, radio emission should always be considered when one proposes a "light" dark matter candidate.
Boehm Celine
Ensslin Torsten
Silk Joseph
No associations
LandOfFree
Radio observations of the Galactic Centre and the Coma cluster as a probe of light dark matter self-annihilations and decay 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 Radio observations of the Galactic Centre and the Coma cluster as a probe of light dark matter self-annihilations and decay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio observations of the Galactic Centre and the Coma cluster as a probe of light dark matter self-annihilations and decay will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-179296