Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-03-06
AIP Conference Proceedings, Volume 924, pp. 764-771 (2007)
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Invited review presented at the conference on "The Multicolored Landscape of Compact Objects and Their Explosive Origins" held
Scientific paper
10.1063/1.2774940
An accretion flow onto a supermassive black hole is the primary process powering quasars. However, a geometry of this flow is not well constrained. Both global MHD simulations and observations suggest that there are several emission components present in the nucleus: an accretion disk, hot plasma (corona or sphere) with electrons scattering the optical and UV photons, and an outflow (wind/jet). The relative location and size of these emission components, as well as their "interplay" affect the emerging quasar spectrum. I review briefly standard accretion disk models and the recent progress, point out discrepancies between the predicted and observed spectra and discuss some issues in fitting these models to the broad-band spectral energy distribution of quasars. I present examples of models fitted simultaneously to the optical-UV-X-ray data and possible constraints on the parameters.
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