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X-Ray Fluctuations fromLocally Unstable Advection-Dominated Disks

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X-Ray Fluctuations fromLocally Unstable Advection-Dominated Disks

Material type
文書・図像類
Author
松元, 亮治
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-
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Material Format
Digital
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NDC
440
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type:textThe response of advection-dominated accretion disks to local disturbancesis examined by one-dimensional numerical simulations. It is generall...

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Material Type
文書・図像類
Author/Editor
松元, 亮治
Author Heading
Text Language Code
eng
NDC
Target Audience
一般
Note (General)
type:text
The response of advection-dominated accretion disks to local disturbancesis examined by one-dimensional numerical simulations. It is generally believedthat advection-dominated disks are thermally stable. We, however, nd that anydisurbance added onto accretion ow at large radii does not decay so rapidly thatit can move inward with roughly the free-fall velocity. Although disturbancescontinue to be present, the global disk structure will not be modied largely.This can account for persistent hard X-ray emission with substantial variationsobserved in active galactic nuclei and stellar black hole candidates during thehard state. Moreover, when the disturbance reaches the innermost parts, anacoustic wave emerges, propagating outward as a shock wave. The resultant lightvariation is roughly (time) symmetric and is quite reminiscent of the observed X-ray shots of Cygnus X-1.
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