LogN-LogS Studies of EGRET Sources

Details LogN-LogS Studies of EGRET Sources LogN-LogS Studies of EGRET Sources

2001-08-22

arxiv.org/abs/astro-ph/0108348v1

Proc. 27th ICRC (Hamburg), 2001, pp.2566-2569

Astronomy and Astrophysics

Astrophysics

4 pages, 8 eps-figures, Proc. of 27th Int. Cosmic Ray Conf. (Hamburg, 2001)

Scientific paper

A comprehensive investigation of logN-logS distributions of gamma-ray sources discovered by EGRET has been performed for subsequent use in population studies. Existing models explaining the spatial arrangement of unidentified sources do not compare against an observed logN-logS distribution. However, viable population models not only have to reproduce the logN-logS distribution for different source classes globally, they have to correspond to apparent differences among their spatial, spectral and variability characteristics. Furthermore, it needs to be understood in which way results from selections among the unidentified sources like "persistent" (Grenier 2000) or "steady" sources (Gehrels et al. 2000) are related to the overall picture regarding their logN-logS characteristics.

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