X-Ray Variability of Galactic Black Holes and Simulated Magnetohydrodynamical Flow

Details X-Ray Variability of Galactic Black Holes and Simulated Magnetohydrodynamical Flow X-Ray Variability of Galactic Black Holes and Simulated Magnetohydrodynamical Flow

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf..119m&link_type=abstract

CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

X-ray time variations of Cyg X-1 in the hard state comprise two components with different timescales; one characterizing the light variation and the other rapid spectral hardening around the peak. These seemingly indicate two (or more) physical processes being involved; e.g., disturbance propagation and magnetic reconnection, leading to magnetic flares. Such features are consistent with the view of MHD accretion flow. The unique properties of the MHD accretion flow are also discussed. To explain the observed X-ray spectral shape and variability during the hard state, magnetic energy needs to be dissipated and be radiated away in short timescales. Finally, we will touch on the peculiar variations of GRS 1915+105, which could be the first evidence of relaxation oscillations between the standard and slim disks.

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