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Estimates of AGN black hole mass and minimum variability timescale
Xie GZ(谢光中)1,2; Chen LE(陈洛恩)1,4,5; Li, HZ1,5; Mao LS(毛李胜)1,5; Dai H(戴宏)1,2,5; Xie, ZH3; Ma L(马力)1,3,5; Zhou SB(周曙白)1; Xie, GZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
2005
Volume5Issue:5Pages:463-470
DOI10.1088/1009-9271/5/5/004
Contribution Rank第1完成单位
Indexed BySCI
KeywordGalaxies : Active Galaxies : Nuclei Galaxies : Fundamental Parameters
AbstractBlack hole mass is one of the fundamental physical parameters of active galactic nuclei (AGNs), for which many methods of estimation have been proposed. One set of methods assumes that the broad-line region (BLR) is gravitationally bound by the central black hole potential, so the black hole mass can be estimated from the orbital radius and the Doppler velocity. Another set of methods assumes the observed variability timescale is determined by the orbital timescale near the innermost stable orbit around the Schwarzschild black hole or the Kerr black hole, or by the characteristic timescale of the accretion disk. We collect a sample of 21 AGNs, for which the minimum variability timescales have been obtained and their black hole masses (M,) have been well estimated from the stellar velocity dispersion or the BLR size-luminosity relation. Using the minimum variability timescales we estimated the black hole masses for 21 objects by the three different methods, the results are denoted by M-s, M-k and M-d, respectively. We compared each of them with M-sigma individually and found that: (1) using the minimum variability timescale with the Kerr black hole theory leads to small differences between M-sigma and M-k, none exceeding one order of magnitude, and the mean difference between them is about 0.53 dex; (2) using the minimum variability timescale with the Schwarzschild black hole theory leads to somewhat larger difference between M-sigma and M-s, larger than one order of magnitude for 6 of the 21 sources, and the mean difference is 0.74 dex; (3) using the minimum variability timescale with the accretion disk theory leads to much larger differences between M-sigma and M-d, for 13 of the 21 sources the differences are larger than two orders of magnitude; and the mean difference is as high as about 2.01 dex.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN1009-9271
URL查看原文
Archive Date2005-11-13
WOS IDWOS:000232872000004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBL-LACERTAE OBJECTS ; ACTIVE GALACTIC NUCLEI ; RAY-LOUD BLAZARS ; LAC OBJECTS ; EVOLUTIONARY SEQUENCE ; LUMINOSITY RELATIONS ; ACCRETION ; GALAXIES ; EMISSION ; QUASARS
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6995
Collection星系研究组
Corresponding AuthorXie, GZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Science, Kunming 650011
2.Yunnan Astrophysics Center, Yunnan University, Kunming 650091
3.Physics Department, Yunnan Normal University, Kunming 650091
4.Physics Department, Yuxi Normal College, Yuxi 653100
5.Graduate University of Chinese Academy of Sciences, Beijing 100049
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xie GZ,Chen LE,Li, HZ,et al. Estimates of AGN black hole mass and minimum variability timescale[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2005,5(5):463-470.
APA Xie GZ.,Chen LE.,Li, HZ.,Mao LS.,Dai H.,...&Xie, GZ .(2005).Estimates of AGN black hole mass and minimum variability timescale.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,5(5),463-470.
MLA Xie GZ,et al."Estimates of AGN black hole mass and minimum variability timescale".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 5.5(2005):463-470.
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