Can substructure in the Galactic Halo explain the ATIC and PAMELA results?

Details Can substructure in the Galactic Halo explain the ATIC and PAMELA results? Can substructure in the Galactic Halo explain the ATIC and PAMELA results?

2009-06-23

arxiv.org/abs/0906.4352v2

Phys.Rev.D80:123513,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 2 figures, submitted to Phys Rev D

Scientific paper

10.1103/PhysRevD.80.123513

Recently, ATIC and PAMELA measured an anomalously large flux of leptonic cosmic rays which may arise from dark matter self-annihilation. While the annihilation signal predicted for a smooth halo is 10^2-10^3 times smaller than the measured excess, the signal can be boosted by the presence of subhalos. We investigate the feasibility of large boost factors using a new Monte Carlo calculation technique that is constrained by previous simulation work on halo substructure. The model accounts for the observed decrease in the amount of substructure with decreasing halo mass and the scatter in halo structural parameters such as the density concentration parameter. Our results suggest that boost factors of the order of 10^2 are ruled out at more than 14 sigma. We conclude that substructure alone, at least with commonly assumed annihilation cross-sections, cannot explain the anomalous flux measured by ATIC and PAMELA.

Affiliated with

Also associated with

No associations

Rating

Can substructure in the Galactic Halo explain the ATIC and PAMELA results? 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 Can substructure in the Galactic Halo explain the ATIC and PAMELA results?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can substructure in the Galactic Halo explain the ATIC and PAMELA results? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-105274