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Variable Unidentified Gamma-Ray Sources Near the Galactic Plane
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Variable Unidentified Gamma-Ray Sources Near the Galactic Plane
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In a recent paper, Romero et al. (1999) have presented the results of a positional correlation analysis of the low-latitude unidentified gamma-ray sources in the Third EGRET catalog with complete lists of galactic objects like supernova remnants, early type stars with strong stellar winds, and OB associations (considered as pulsar tracers). We have now carried out a study of those 42 sources at |b|<10 deg for which no counterpart was found at all. A variability analysis shows that this sample contains a population of sources with high levels of variability at gamma-rays. The surface density of these variable sources is 5 times higher than what is expected for unidentified AGNs seen through the Galactic plane. We discuss the origin of this presumed Galactic population of gamma-ray objects and the role that INTEGRAL could play in their physical identification.
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