ChJAA Vol 4, No 1 (2004) / Bian

The Difference between the α-disks of Seyfert 1 Galaxies and Quasars

Wei-Hao Bian, Hong Dong, Yong-Heng Zhao


In a previous paper, it was suggested that contamination of the nuclear luminosity by the host galaxy plays an important role in determining the parameters of the standard α disk of AGNs. Using the nuclear absolute B band magnitude instead of the total absolute B band magnitude, we have recalculated the central black hole masses, accretion rates and disk inclinations for 20 Seyfert 1 galaxies and 17 Palomar-Green (PG) quasars. It is found that a small value of α is needed for the Seyfer 1 galaxies than for the PG quasars. This difference in α possibly leads to the different properties of Seyfert 1 galaxies and quasars. Furthermore, we find most of the objects in this sample are not accreting at super-Eddington rates if we adopt the nuclear optical luminosity in our calculation.


galaxies: active --- galaxies: nuclei --- quasars: Seyfert

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