Consistency of the black hole mass determination in AGN from the reverberation and the X-ray excess variance method

Details Consistency of the black hole mass determination in AGN from the reverberation and the X-ray excess variance method Consistency of the black hole mass determination in AGN from the reverberation and the X-ray excess variance method

2006-06-26

arxiv.org/abs/astro-ph/0606621v1

Mon.Not.Roy.Astron.Soc.370:1534-1540,2006

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, 1 table; accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10576.x

Values of black hole masses are frequently determined with the help of the reverberation method. This method requires a specific geometrical factor related to the distribution of the orbits of the Broad Line Region clouds. Onken et al. determined the value f^2= 1.37+/-0.45 from the black hole mass - dispersion relation. In this paper we determine this factor using an independent mass determination from the X-ray variance method for a number of Seyfert 1 galaxies and comparing them with the reverberation results by Peterson et al. We obtain mean value f^2 = 1.12 +/- 0.54, consistent with Onken et al. Both values are larger than the value 0.75 corresponding to a spherical geometry. It indicates that most probably all values of the black hole masses obtained with the use of the Kaspi et al. formulae should be multiplied by a factor of \sim 1.7. This also shows that the Broad Line Region is rather flat, and hints for a dependence of the factor f^2 on a source inclination seem to be present in the data.

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