AAS 204th Meeting, June 2004
Session 46 Plasma Astrophysics of Coronae: Solar, Stellar and Accretion Disk
Topical Session, Tuesday, June 1, 2004, 2:30-4:00pm, 4:15-6:00pm, 710/712

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[46.06] Coronae of black hole accretion disks: the X-ray view

C.S. Reynolds (University of Maryland, College Park)

Accreting black holes are prodigious sources of hard X-rays, supporting the notion that these objects support powerful coronae. I will discuss the constraints on the nature of these coronae that arise from modern spectral and timing X-ray observations. A particularly powerful probe are the relativistically broadened iron fluorescent lines observed in these systems; observations of these spectral features suggest the existence of extremely compact coronae very close to the black hole event horizon. Evidence for disk-corona coupling from observations of quasi-periodic oscillations will also be discussed.

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