Contribution of unresolved point sources to the galactic diffuse emission

Details Contribution of unresolved point sources to the galactic diffuse emission Contribution of unresolved point sources to the galactic diffuse emission

2006-09-12

arxiv.org/abs/astro-ph/0609306v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

The detection by the HESS atmospheric Cherenkov telescope of fifteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved point sources like those detected by HESS to the diffuse Galactic emission measured by EGRET and recently at higher energies by the Milagro Collaboration. Assuming that HESS sources have all the same intrinsic luminosity, the contribution of this new source population can account for most of the Milagro $\gamma$-ray emission at TeV energies and between 10 and 20 per cent of EGRET diffuse Galactic $\gamma$-ray emission for energies bigger than 10 GeV. Also, by combining the HESS and the Milagro results, constraints can be put on the distribution and the luminosities of gamma ray emitters in the Galaxy.

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