Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.326b&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The weakness of X-ray reflection in the hard state of accreting black holes is suggested to be due to bulk motion of the flaring plasma away from the disk. A mildly relativistic bulk motion causes a reduction of X-ray emission towards the disk which reflects/reprocesses the incident X-rays. The observed slope of the X-ray spectrum and the amount of reflection can both be explained if the flaring plasma has a bulk velocity ~c/3. If the energy is released in compact magnetic flares localized atop the accretion disk, then the resulting bulk motion implies that the flares are accompanied by plasma ejection from the active regions. We discuss one possible scenario: the flares are dominated by e^ +- pairs which are accelerated away from the reflector by the pressure of the reflected radiation.
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