Universal spectral shape of high accretion rate AGN

Details Universal spectral shape of high accretion rate AGN Universal spectral shape of high accretion rate AGN

2003-09-08

arxiv.org/abs/astro-ph/0309242v1

Astron.Astrophys.412:317-329,2003

Astronomy and Astrophysics

Astrophysics

14 pages, 14 figures, 1 table, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20031441

The spectra of quasars and NLS1 galaxies show surprising similarity in their spectral shape. They seem to scale only with the accretion rate. This is in contradiction with the simple expectations from the standard disk model which predicts lower disk temperature for higher black hole mass. Here we consider two mechanisms modifying the disk spectrum: the irradiation of the outer disk due to the scattering of the flux by the extended ionized medium (warm absorber and the development of the warm Comptonizing disk skin under the effect of the radiation pressure instability. Those two mechanisms seem to lead to a spectrum which indeed roughly scales, as observed, only with the accretion rate. The scenario applies only to objects with relatively high luminosity to the Eddington luminosity ratio for which disk evaporation is inefficient.

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