Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0730g&link_type=abstract
American Astronomical Society, HEAD meeting #9, #7.30; Bulletin of the American Astronomical Society, Vol. 38, p.354
Astronomy and Astrophysics
Astronomy
2
Scientific paper
For 9 years, EGRET has observed gamma-ray sources at energies above 100 MeV. They are detected above the intense interstellar radiation due to cosmic-ray interactions in the Milky Way. The comparison of gas and dust tracers with this radiation in the solar neighbourhood has revealed large amounts of dark gas at the transition between the HI and CO phases (Grenier et al. 2005, Science, 307, 1292). This phase is not seen in radio, but its column-densities, clumpiness, and large spread across the sky strongly affect the gamma-ray source detectability. We have revised the interstellar background model accordingly and present a new catalogue of EGRET sources above 100 MeV. One third of the former 3EG sources (Hartman et al. 1999, ApJS, 123, 79) have changed, either in position or in flux and significance. These changes primarily affect the unidentified sources. Over 50 sources, mostly those associated with the Gould Belt, are not confirmed as point sources. A search for likely blazar, pulsar, and supernova remnant counterparts has been performed on the new list and the results will be presented.
Casandjian J.
Grenier Isabelle A.
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