On the origin of obscuring tori in the Galactic nucleus and active Galactic nuclei

Details On the origin of obscuring tori in the Galactic nucleus and active Galactic nuclei On the origin of obscuring tori in the Galactic nucleus and active Galactic nuclei

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l..31y&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 1, p. L31-L34

Astronomy and Astrophysics

Astronomy

14

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Galactic Evolution, Interstellar Magnetic Fields, Seyfert Galaxies, Stellar Mass Ejection, Angular Momentum, Background Radiation, Mass Distribution

Scientific paper

Differences between Seyfert 1 and Seyfert 2 galaxies can be explained by the existence of obscuring tori at distances a few parsecs from central black holes. In the Galaxy there exists a similar thick disk structure, the circumnuclear disk, at a distance approx. 1.7 pc from the Galactic center. We examine the possibility that both structures are the result of turbulence-supported viscous evolution and accumulation of accreted material in soft gravitational potentials of galactic nuclei. The accumulation occurs in a region where the gravitational potential provides reduced differential rotation compared with differential rotation in the neighboring regions. The existence of these structures requires that the ratio of the smooth background mass within approx. a few parsecs to the central black hole mass be of order 1. We also discuss how strong magnetic fields prevent such tori formation and suggest evolutionary possibilities consistent with our results.

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