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Black Hole Masses and Unification of Seyferts

Published online by Cambridge University Press:  25 May 2016

R. Bachev ,
G. T. Petrov ,
L. Slavcheva  and
B. Mihov
R. Bachev
Affiliation:
Institute of Astronomy, Sofia, Bulgaria, e-mail: bachevr@astro.bas.bg
G. T. Petrov
Affiliation:
Institute of Astronomy, Sofia, Bulgaria, e-mail: bachevr@astro.bas.bg
L. Slavcheva
Affiliation:
Institute of Astronomy, Sofia, Bulgaria, e-mail: bachevr@astro.bas.bg
B. Mihov
Affiliation:
Institute of Astronomy, Sofia, Bulgaria, e-mail: bachevr@astro.bas.bg

Extract

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The most commonly invoked power source of Active Galactic Nuclei (AGN) is accretion of galactic gas (probably through a disk) onto a supermassive black hole in the center of the nucleus (Rees 1984). As is well known, a black hole is completely defined by its mass and angular momentum. The unification scheme of active galaxies assumes that two known Seyfert types (Sy1 and Sy2) are not intrinsically different, i. e. their black hole masses, accretion rates and the whole internal structures are identical (Antonucci 1993) and observed differences are due just to a different orientation to the observer of the axisymmetrical central structure (central engine, BLR and thick torus, shadowing broad lines from some directions).

Type
III. AGN Theory and Models
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 311 - 312
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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