Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...73g&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)73-(5)76
Astronomy and Astrophysics
Astronomy
11
Galactic Radiation, Gamma Ray Astronomy, Gamma Rays, H I Regions, Interstellar Matter, Molecular Clouds, Spatial Distribution, Statistical Analysis, Active Galactic Nuclei, Gamma Ray Observatory, Pulsars, Radio Galaxies, Supernova Remnants
Scientific paper
About fifty unidentified gamma-ray sources, from the first Energetic Gamma Ray Experiment Telescope (EGRET) catalog, lie above a few degrees from the Galactic plane. Yet they correspond to no attractive counterparts. A statistical analysis has been developed the study their spatial distribution, including effects of the non-uniform detection threshold and exposure. As a result, the source positions are not consistent with a uniform distribution at medium and high latitude, but they appear significantly correlated with the structure of the nearby interstellar medium. Most of them seem to belong to the giant molecular clouds and their HI envelopes. Only very few Geminga-like pulsars in our vicinity may be present in this sample.
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