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• W3105631567 startingPage "964" @default.
• W3105631567 abstract "On the basis of data from an energy-conserving three-dimensional general relativistic MHD simulation, we predict the statistical character of variability in the coronal luminosity from accreting black holes. When the inner boundary of the corona is defined to be the electron scattering photosphere, its location depends only on the mass accretion rate in Eddington units . Nearly independent of viewing angle and , the power spectrum over the range of frequencies from approximately the orbital frequency at the ISCO to ∼100 times lower is well approximated by a power law with index −2, crudely consistent with the observed power spectra of hard X-ray fluctuations in active galactic nuclei and the hard states of Galactic black hole binaries. The underlying physical driver for variability in the light curve is variations in the accretion rate caused by the chaotic character of MHD turbulence, but the power spectrum of the coronal light output is significantly steeper. Part of this contrast is due to the fact that the mass accretion rate can be significantly modulated by radial epicyclic motions that do not result in dissipation, and therefore do not drive luminosity fluctuations. The other part of this contrast is due to the inward decrease of the characteristic inflow time, which leads to decreasing radial coherence length with increasing fluctuation frequency." @default.
• W3105631567 created "2020-11-23" @default.
• W3105631567 creator A5002407766 @default.
• W3105631567 creator A5028152548 @default.
• W3105631567 date "2009-09-03" @default.
• W3105631567 modified "2023-09-27" @default.
• W3105631567 title "GRMHD PREDICTION OF CORONAL VARIABILITY IN ACCRETING BLACK HOLES" @default.
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• W3105631567 doi "https://doi.org/10.1088/0004-637x/703/1/964" @default.
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