Microquasars in the low/hard state: strong coronae, compact jets, and the high frequency variability

Details Microquasars in the low/hard state: strong coronae, compact jets, and the high frequency variability Microquasars in the low/hard state: strong coronae, compact jets, and the high frequency variability

2002-08-05

arxiv.org/abs/astro-ph/0208091v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. Proceedings of the 4th Microquasar Workshop, 2002, eds. Durouchoux, Fuchs, Rodriguez, published by the Cent

Scientific paper

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.

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