Obscuration of Active Galactic Nuclei by Circumnuclear Starburst-Origin Clouds

Details Obscuration of Active Galactic Nuclei by Circumnuclear Starburst-Origin Clouds Obscuration of Active Galactic Nuclei by Circumnuclear Starburst-Origin Clouds

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..245w&link_type=abstract

THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 245-250 (2

Physics

Galactic Nuclei, Seyfert Galaxies, Interstellar Molecular Clouds, Galactic Nuclei, Circumnuclear Matter, And Bulges, Starburst Galaxies And Infrared Excess Galaxies, Active And Peculiar Galaxies And Related Systems, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds

Scientific paper

The frequent association of circumnuclear starbursts with type 2 Seyfert galaxies suggests that the obscuration of active galactic nuclei (AGNs) could be physically related to the starburst events. So we pursue the dynamics of dusty gas clouds that spurt out from circumnuclear starburst regions, with including radiation forces by an AGN and a starburst. Here, we solve radiation transfer for clouds, with taking into consideration the growth of clouds by inelastic cloud-cloud collisions and the resultant change of optical depth.
As a result, it is shown that if the starburst is more luminous than the AGN, gas clouds originating in the circumnuclear starburst can contribute to the obscuration to produce type 2 Seyfert galaxies. In contrast, if the AGN luminosity overwhelms the starburst one, almost all clouds are ejected from the galaxy owing to the radiation pressure by the AGN, resulting in the formation of a quasar-like object.

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