Volume 387, Number 3, June I 2002
|Page(s)||804 - 817|
|Section||Cosmology (including clusters of galaxies)|
|Published online||17 May 2002|
The role of the central stellar cluster in active galactic nuclei
I. Semi-analytical model
Fesenkov Astrophysical Institute, Observatory, 480020 Almaty, Kazakstan e-mail: email@example.com
2 Isaac Newton Institute of Chile, the Kazakhstan branch
3 Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
Corresponding author: B. Czerny, firstname.lastname@example.org
Accepted: 18 February 2002
The subject of the paper is the role of the massive stellar cluster in the activity phenomenon and in the structure of active galactic nuclei. We introduce a simple model of stellar dynamics in the internal part of the cluster, which allows us to include both the star-disk and the star-star interactions. It is shown that the properties of the distribution of stars in the vicinity of the black hole are determined both by the interaction of the stars with the accretion disk and by the pair gravitational and contact interaction between the stars. We calculate the distribution of stars in the central parts of the cluster and we discuss possible effects of stellar mass-loss due to the star-disk interaction. Finally, we study the implications of the central cluster for active galactic nuclei activity. We model the broad line region assuming that the gaseous wakes, following stars after each disk crossing, play the role of the broad line region clouds, and we calculate the corresponding line profiles. We also analyze the contribution of star-star and star-disk collisions to active galactic nuclei variability.
Key words: galaxies: active / galaxies: Seyfert / stellar dynamics / ultraviolet: galaxies / X-rays: galaxies
© ESO, 2002
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