On the Nature of the variable gamma-ray sources in the Galaxy

Details On the Nature of the variable gamma-ray sources in the Galaxy On the Nature of the variable gamma-ray sources in the Galaxy

2004-09-09

arxiv.org/abs/astro-ph/0409228v2

Astrophys.Space Sci. 297 (2005) 119-129

Astronomy and Astrophysics

Astrophysics

(1)Universitat de Barcelona (2)Instituto Argentino de Radioastronomia (3)Universidad Nacional de La Plata 12 pages, 5 figures.

Scientific paper

10.1007/s10509-005-7588-8

Population studies of EGRET gamma-ray sources indicate that there is a distinctive population of bright sources at low galactic latitudes. The sources have a distribution consistent with that of young galactic objects, with a concentration toward the inner spiral arms. There is a subgroup that displays strong variability with timescales from days to months. Following an earlier suggestion by Kaufman Bernado et al. (2002), we explore the possibility that these sources could be high-mass microquasars. Detailed models for the gamma-ray emission that include inverse Compton interactions of electrons in the relativistic jets and photons from all local fields (stellar UV photons, synchrotron photons, soft X-ray photons from the accretion disk, and hard X-ray photons from a corona) are presented. We conclude that microquasars are excellent candidates for the parent population of the subgroup of variable low-latitude EGRET sources.

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