Star-disk collisions in active galactic nuclei and the origin of the broad line region

Details Star-disk collisions in active galactic nuclei and the origin of the broad line region Star-disk collisions in active galactic nuclei and the origin of the broad line region

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..564z&link_type=abstract

Testing the AGN paradigm. AIP Conference Proceedings, Volume 254, pp. 564-567 (1992).

Physics

1

Black Holes, Radiation Mechanisms, Polarization

Scientific paper

Stars of a cluster surrounding the central black hole in an AGN will collide with the accretion disk. For a central black hole of 108 Msolar and a cluster with 107-108 stars within a parsec, one estimates that ~104 such collisions will occur per year. Collisions are hypersonic (Mach number M>>1). Some of the wake of the star-the disk material shocked by its passage-will follow it out of the disk. Such ``star tails'' with the estimated masses δm~1027-1027 g subsequently expand, cool and begin to recombine. We propose that-when illuminated by the ionizing flux from the central source-they are likely to be the origin of the observed broad emission lines.

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