Blazar black hole masses.

Details Blazar black hole masses. Blazar black hole masses.

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pnaoc...4..113x&link_type=abstract

Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 4, No.

Mathematics

Probability

Active Galactive Nuclei, Fundamental Parameters, Black-Hole Mass

Scientific paper

Black hole mass, along with the ratio of the accretion rate to the Eddington accretion rate, is a fundamental parameter of active galactive nuclei (AGNs). Using Xie's method of the black hole mass estimate, the authors developed their sample and estimated the black hole masses represented by MH for 21 blazars. The authors compare 21 cases for each of which the relevant black hole mass has also been estimated by the MBH-σ correlation method, which is represented by Mσ. And the authors find that (1) MH are systematically lower than Mσ, but the differences between Mσ and MH are very small for most of the sources; (2) there is a significant correlation between Mσ and MH, the correlation coefficient r=0.823 with chance probability p~1.0×10-4. Based on these properties mentioned above and the standard model of AGNs, the authors prove that the nature of the systematical difference between Mσ and MH is that Mσ represents the mass in broad emission line region, while MH represents the mass in the continual emission region which is near the innermost stable orbit around the black hole. That is, Mσ would be overestimated. From Mσ, they calculate the central black hole mass again, which is almost equal to the correspondent MH.

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