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

M. Nikołajuk (Lead / Corresponding author), B. Czerny, J. Ziółkowski, M. Gierliński

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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 f2 = 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 f2 = 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 ∼1.7. This also shows that the broad-line region is rather flat, and hints for a dependence of the factor f2 on a source inclination seem to be present in the data.

Original languageEnglish
Pages (from-to)1534-1540
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume370
Issue number3
Early online date7 Jul 2006
DOIs
Publication statusPublished - 11 Aug 2006

Keywords

  • Galaxies: active
  • Galaxies: Seyfert
  • X-rays: galaxies

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