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Source population synthesis and the Galactic diffuse gamma-ray emission
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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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Resolved and unresolved Galactic gamma-ray sources
From HAWC and LHAASO source positions the authors infer a total Galactic source luminosity near 1e37 erg/s in the 1-10 TeV band and conclude that unresolved sources contribute a minority of the diffuse flux over most ...
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