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.

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.2106c&link_type=abstract

American Astronomical Society, HEAD meeting #9, #21.06

Astronomy and Astrophysics

Astronomy

Scientific paper

A major difficulty when studying the high energy gamma ray diffuse emission from the Galaxy is to disantangle the truly diffuse emission from that produced by unresolved sources. The detection by the HESS atmospheric Cherenkov telescope of eighteen 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 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 for less than 10 per cent of EGRET diffuse galactic gamma-ray emission at GeV energies. Also, by combining the HESS and the Milagro results, constraints can be put on the distribution of gamma ray emitters in the Galaxy and on their luminosity.

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