Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-03
Publ.Astron.Soc.Jap.51:571-577,1999
Astronomy and Astrophysics
Astrophysics
17 pages, 4 figures, 2 tables; LaTeX2.09 (aas2pp4.sty); submitted to the Astrophysical Journal; also available at http://ast
Scientific paper
We propose a simple and unambiguous way to deduce the parameters of black holes which may reside in AGNs and some types of X-ray binaries. The black-hole mass and angular momentum are determined in physical units. The method is applicable to the sources with periodic components of variability, provided one can assume the following: (i) Variability is due to a star or a stellar-mass compact object orbiting the central black hole and passing periodically through an equatorial accretion disk (variability time-scale is given by the orbital period). (ii) The star orbits almost freely, deviation of its trajectory due to passages through the disk being very weak (secular); the effect of the star on the disk, on the other hand, is strong enough to yield observable photometric and spectroscopic features. (iii) The gravitational field within the nucleus is that of the (Kerr) black hole, the star and the disk contribute negligibly.
de Felice Fernando
Karas Vladimir
Semerak Oldřich
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