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ULXs, Microblazars, and the Unidentified EGRET sources

Yousaf M. Butt·Gustavo E. Romero·Diego F. Torres
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Abstract

We suggest that ultraluminous X-ray sources (ULXs) and some of the variable low latitude EGRET gamma-ray sources may be two different manifestations of the same underlying phenomena: high-mass microquasars with relativistic jets forming a small angle with the line of sight (i.e. microblazars). Microblazars with jets formed by relatively cool plasma (Lorentz factors for the leptons up to a few hundreds) naturally lead to ULXs. If the jet contains very energetic particles (high-energy cutoff above Lorentz factors of several thousands) the result is a relatively strong gamma-ray source. As pointed out by Kaufman Bernado, Romero & Mirabel (2002), a gamma-ray microblazar will always have an X-ray counterpart (although it might be relatively weak), whereas X-ray microblazars might have no gamma-ray counterparts.

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Yousaf M. Butt, Gustavo E. Romero, Diego F. Torres. 2003-01-31. ULXs, Microblazars, and the Unidentified EGRET sources. https://arxiv.org/abs/astro-ph/0301650

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