Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (413) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· NED Objects (1)
· Also-Read Articles (Reads History)
· Translate This Page
Molecular tori in Seyfert galaxies - Feeding the monster and hiding it
Krolik, Julian H.; Begelman, Mitchell C.
AA(Johns Hopkins University, Baltimore, MD; California, University, Santa Barbara), AB(Joint Institute for Laboratory Astrophysics; Colorado, University, Boulder)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 702-711. Research supported by the Ball Corp., Rockwell International Corp., and Exxon Education Foundation. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Black Holes (Astronomy), Galactic Nuclei, Interstellar Gas, Molecular Clouds, Seyfert Galaxies, Energy Dissipation, Gravitational Fields, Size Distribution, Stellar Winds
Bibliographic Code:


Much evidence exists that the majority of Seyfert nuclei are surrounded by a geometrically and optically thick torus of dusty, obscuring gas a few parsecs from the center. The authors discuss the principal properties of the gas in the torus. It is almost certainly not smoothly distributed; most of its mass is gathered into clouds. The balance between cloud merger and tidal shearing ensures that the covering factor of these clouds in the axial direction is of order unity and determines the shape of the cloud-size distribution function. It is shown that the same viscous heating responsible for the large geometrical thickness of the obscuring region removes the angular momentum from enough clouds to permit them to be captured by the central black hole, fueling its activity and stabilizing the balance between evaporation and dissipative inflow.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints