ULXs, Microblazars, and the Unidentified EGRET sources
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.
Cite
@article{arxiv.astro-ph/0301650,
title = {ULXs, Microblazars, and the Unidentified EGRET sources},
author = {Yousaf M. Butt and Gustavo E. Romero and Diego F. Torres},
journal= {arXiv preprint arXiv:astro-ph/0301650},
year = {2007}
}
Comments
4 pages; to be submitted to the proceedings of the international workshop on pulsars, AXPs and SGRs observed with Beppo-SAX and other observatories