Microquasars in the low/hard state: strong coronae, compact jets, and the high frequency variability
Abstract
We apply a model of magnetically dominated coronae above standard accretion discs to the low/hard state of galactic black holes. When the disc-corona coupling is accounted for self-consistently assuming that magneto-rotational instability is at work in the disc, and that the corona is generated by buoyant escape of disc magnetic structures, then the model predicts powerful, X-ray emitting coronae at low accretion rates. A main consequence is discussed: the possibility that the corona itself is the launching site of powerful, MHD driven jets/outflows. This depends crucially of the coronal scaleheight. Finally, we present the first radial profiles of a corona a different accretion rates, and discuss their implications for high frequency variability.
Cite
@article{arxiv.astro-ph/0208091,
title = {Microquasars in the low/hard state: strong coronae, compact jets, and the high frequency variability},
author = {A. Merloni},
journal= {arXiv preprint arXiv:astro-ph/0208091},
year = {2007}
}
Comments
4 pages, 1 figure. Proceedings of the 4th Microquasar Workshop, 2002, eds. Durouchoux, Fuchs, Rodriguez, published by the Center for Space Physics: Kolkata