Accretion in Active Galactic Nuclei. (arXiv:1811.04326v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Czerny_B/0/1/0/all/0/1">Bozena Czerny</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moghaddam_M/0/1/0/all/0/1">Mohammad Hassan Naddaf Moghaddam</a>
We review the current status of the understanding how the accretion onto the
central black hole proceeds in Active Galaxies. Standard accretion disk is a
key element in all relatively bright active galaxies like Seyferts and quasars,
although it is not present in very low luminosity sources, like Sgr A*.
However, the standard disk does not explain the broad band spectrum, so the
disk has to be supplemented with a number of additional components, and our
deeper understanding of these components is still far from being complete.
These additional elements are: compact hard X-ray corona, inner hot flow, warm
corona, disk wind and the Broad Line Region, and finally dusty/molecular torus.
All these elements seem to be needed in various proportions, depending
predominantly on the Eddington ratio of a given source. These elements also
interact with each other which is not yet fully taken into account.
We review the current status of the understanding how the accretion onto the
central black hole proceeds in Active Galaxies. Standard accretion disk is a
key element in all relatively bright active galaxies like Seyferts and quasars,
although it is not present in very low luminosity sources, like Sgr A*.
However, the standard disk does not explain the broad band spectrum, so the
disk has to be supplemented with a number of additional components, and our
deeper understanding of these components is still far from being complete.
These additional elements are: compact hard X-ray corona, inner hot flow, warm
corona, disk wind and the Broad Line Region, and finally dusty/molecular torus.
All these elements seem to be needed in various proportions, depending
predominantly on the Eddington ratio of a given source. These elements also
interact with each other which is not yet fully taken into account.
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