Source population synthesis and the Galactic diffuse gamma-ray emission

Details Source population synthesis and the Galactic diffuse gamma-ray emission Source population synthesis and the Galactic diffuse gamma-ray emission

2006-09-13

arxiv.org/abs/astro-ph/0609359v3

Astrophys.SpaceSci.309:35-41,2007

Astronomy and Astrophysics

Astrophysics

Astrophysics and Space Science, in press. (Proceedings of Conference 'The multi-messenger approach to high-energy gamma-ray so

Scientific paper

10.1007/s10509-007-9480-1

Population synthesis is used to study the contribution from undetected sources to the Galactic ridge emission measured by EGRET. Synthesized source counts are compared with the 3rd EGRET catalogue at low and high latitudes. For pulsar-like populations, 5-10% of the emission >100 MeV comes from sources below the EGRET threshold. A steeper luminosity function can increase this to 20% without violating EGRET source statistics. Less luminous populations can produce much higher values without being detected. Since the unresolved source spectrum is different from the interstellar spectrum, it could provide an explanation of the observed MeV and GeV excesses above the predictions, and we give an explicit example of how this could work.

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