Estimating Black Hole Masses of Blazars

Journal of astrophysics and astronomy

F. K. Liu³  M. Z. Kong⁴  Xue-Bing Wu1³  J. L. Han¹  R. Wang² 

[1] National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China.$$;Steward Observatory, University of Arizona, Tucson, AZ 85721, USA.$$;Department of Astronomy, Peking University, Beijing 100871, China.$$;Department of Physics, Hebei Normal University, Shijiazhang 050016, China.$$

关键词: Black holes;    galaxies: active;    blazars;    jets.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Estimating black hole masses of blazars is still a big challenge. Because of the contamination of jets, using the previously suggested size–continuum luminosity relation can overestimate the broad line region (BLR) size and black hole mass for radio-loud AGNs, including blazars. We propose a new relation between the BLR size and 𝐻𝛽 emission line luminosity and present evidences for using it to get more accurate black hole masses of radio-loud AGNs. For extremely radio-loud AGNs such as blazars with weak/absent emission lines, we suggest the use of fundamental plane relation of their elliptical host galaxies to estimate the central velocity dispersions and black hole masses, if their velocity dispersions are not known but the host galaxies can be mapped. The black hole masses of some well-known blazars, such as OJ 287, AO 0235+164 and 3C 66B are obtained using these two methods and the 𝑀–𝜎 relation. The implications of their black hole masses on other related studies are also discussed.

【 授权许可】

Unknown