Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission

Details Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission

2009-04-29

arxiv.org/abs/0904.4645v2

Phys.Rev.D80:043525,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

new benchmark models for dark matter and cosmic-ray introduced, few comments and references added, conclusion unchanged

Scientific paper

10.1103/PhysRevD.80.043525

We propose to test the dark matter (DM) interpretation of the positron excess observed by the PAMELA cosmic-ray (CR) detector through the identification of a Galactic diffuse gamma-ray component associated to DM-induced prompt and radiative emission. The goal is to present an analysis based on minimal sets of assumptions and extrapolations with respect to locally testable or measurable quantities. We discuss the differences between the spatial and spectral features for the DM-induced components (with an extended, possibly spherical, source function) and those for the standard CR contribution (with sources confined within the stellar disc), and propose to focus on intermediate and large latitudes. We address the dependence of the signal to background ratio on the model adopted to describe the propagation of charged CRs in the Galaxy, and find that, in general, the DM-induced signal can be detected by the Fermi Gamma-ray Space Telescope at energies above 100 GeV. An observational result in agreement with the prediction from standard CR components only, would imply very strong constraints on the DM interpretation of the PAMELA excess. On the other hand, if an excess in the diffuse emission above 100 GeV is identified, the angular profile for such emission would allow for a clean disentanglement between the DM interpretation and astrophysical explanations proposed for the PAMELA excess. We also compare to the radiative diffuse emission at lower frequencies, sketching in particular the detection prospects at infrared frequencies with the Planck satellite.

Affiliated with

Also associated with

No associations

Rating

Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission 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 Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-512593