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Spectral models of convection-dominated accretion flows

Jul, 2000

Published in:

Astrophys.J. 552 (2001) 221

e-Print:

astro-ph/0007037 [astro-ph]

DOI:

10.1086/320465

View in:

ADS Abstract Service

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Abstract: (arXiv)

For small values of the dimensionless viscosity parameter, namely

\alpha\lesssim 0.1

, the dynamics of non-radiating accretion flows is dominated by convection: convection strongly suppresses the accretion of matter onto the central object and transports a luminosity

\sim 10^{-3}-10^{-2} \dot M c^2

from small to large radii in the flow. A fraction of this convective luminosity is likely to be radiated at large radii via thermal bremsstrahlung emission. We show that this leads to a correlation between the frequency of maximal bremsstrahlung emission and the luminosity of the source,

\nu_{\rm peak} \propto L^{2/3}

. Accreting black holes with X-ray luminosities

10^{-4} L_{Edd}\gtrsim L_X(0.5-10{\rm keV}) \gtrsim 10^{-7}L_{Edd}

are expected to have hard X-ray spectra, with photon indices

\Gamma\sim2

, and sources with

L_X\lesssim 10^{-9}L_{Edd}

are expected to have soft spectra, with

\Gamma\sim3.5

. This is testable with {\it Chandra} and {\it XMM}.

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Figures(0)

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