Difference of $α$-disks between Seyfert 1 galaxies and Quasars

Details Difference of $α$-disks between Seyfert 1 galaxies and Quasars Difference of $α$-disks between Seyfert 1 galaxies and Quasars

2003-09-25

arxiv.org/abs/astro-ph/0309702v1

Chin.J.Astron.Astrophys. 4 (2004) 28-36

Astronomy and Astrophysics

Astrophysics

6 pages, 1 tables, accepted by Chin. J. Astron. Astrophys

Scientific paper

In a previous paper (Bian & Zhao 2002), it was suggested that contamination to the luminosity of galactic nucleus from the host galaxies play an important role in determining parameters of the standard $\alpha$ disk for AGNs. Using the nuclear absolute B band magnitude instead of the total absolute B band magnitude, the central black hole masses, the accretion rates and the disk inclinations to the line of sight for 20 Seyfert 1 galaxies and 17 Palomar-Green (PG) quasars were recalculated. It was found that small value of $\alpha$ is needed in the accretion disk for Seyfert 1 galaxies compared with PG quasars. The difference of $\alpha$ maybe lead to the different properties between Seyfert 1 galaxies and Quasars. Furthermore, we found most of the objects in this sample are not accreting at super-Eddington rates when we adopted the nuclear optical luminosity in our calculation.

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