Accretion in Strong Gravity: from Galactic to Supermassive Black Holes |
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| Authors: | Chris Done Marek Gierliński |
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| Institution: | (1) Department of Physics, University of Durham, London, UK |
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| Abstract: | The galactic black hole binary systems give an observational template showing how the accretion flow changes as a function
of increasing mass accretion rate, or L/LEdd. These data can be synthesised with theoretical models of the accretion flow to give a coherent picture of accretion in strong
gravity, in which the major hard-soft spectral transition is triggered by a change in the nature and geometry of the inner
accretion flow from a hot, optically thin plasma to a cool, optically thick accretion disc. However, a straightforward application
of these models to AGN gives clear discrepancies in overall spectral shape. Either the underlying accretion model is wrong,
despite its success in describing the Galactic systems and/or there is additional physics which breaks the simple scaling
from stellar to supermassive black holes. |
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| Keywords: | black holes accretion flows |
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