On the Nature of the Variable Gamma-Ray Sources at Low Galactic Latitudes |
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| Authors: | Valentí Bosch-Ramon Gustavo E Romero Josep M Paredes |
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| Institution: | (1) Universitat de Barcelona, Spain;(2) Instituto Argentino de Radioastronomía, FCAGLP, Universidad Nacional de La Plata, Spain |
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| Abstract: | 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 Bernadó 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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| Keywords: | microquasars X-ray binaries jets gamma-rays |
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