C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET19:46:07

2007A&A...470...61D - Astronomy and Astrophysics, volume 470, 61-66 (2007/7-4)

A new determination of the extragalactic background of diffuse gamma rays taking into account dark matter annihilation.


Abstract (from CDS):

The extragalactic background (EGB) of diffuse gamma rays can be determined by subtracting the Galactic contribution from the data. This requires a Galactic model (GM) and we include for the first time the contribution of dark matter annihilation (DMA), which was previously proposed as an explanation for the EGRET excess of diffuse Galactic gamma rays above 1GeV. In this paper it is shown that the newly determined EGB shows a characteristic high energy bump on top of a steeply falling soft contribution. The bump is shown to be compatible with a contribution from an extragalactic DMA signal from weakly interacting massive particles (WIMPs) with a mass between 50 and 100GeV in agreement with the EGRET excess of the Galactic diffuse gamma rays and in disagreement with earlier analysis. The remaining soft contribution of the EGB is shown to resemble the spectra of the observed point sources in our Galaxy.

Abstract Copyright:

Journal keyword(s): diffuse radiation - dark matter - gamma rays: observations

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 185 1
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
3 NAME Monoceros Stream St* ~ ~           ~ 308 0

    Equat.    Gal    SGal    Ecl

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