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Compact Nuclei of Galaxies and Sources of Their Energy

Published online by Cambridge University Press:  25 May 2016

L.Sh. Grigoryan  and
G.S. Sahakian
L.Sh. Grigoryan
Affiliation:
Institute of Applied Problems in Physics, Yerevan, 375014, Armenia
G.S. Sahakian
Affiliation:
Yerevan State University, Yerevan, 375049, Armenia

Extract

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A model of compact nuclei of galaxies as spherically-symmetric star clusters is proposed. A concept of the equation of state for star clusters in statistical equilibrium is introduced (galactic nuclei are systems in statistical equilibrium if their age is of the order of the age of the Universe). It is shown that a statistically equilibrium star cluster is described by the equation of state of a polytrope P = aρ3, and with its help the main parameters of compact nuclei of galaxies are calculated. The formula M = 2.524GR5/a for mass M and radius R of the cluster is derived.

Type
III. AGN Theory and Models
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 323
Copyright
Copyright © Astronomical Society of the Pacific 1999