Universal spectral shape of high accretion rate AGN

Abstract The spectra of radio quiet and NLS1 galaxies show surprising similarity in their shape. They seem to scale only with the accretion rate and not with central black hole mass. We consider two mechanisms modifying the disk spectrum. First, the outer parts of the disk are irradiated by the flux emerging from the inner parts. This is due to the scattering of the flux by the extended hot medium (warm absorber). Second, the process is connected with the development of the disk warm Comptonizing skin above the disk and/or coronae. Our scenario applies only to objects with relatively high luminosity to the Eddington luminosity ratio for which disk evaporation is inefficient.