Estimates of AGN black hole mass and minimum variability timescale

	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, ZH 3; Ma L(马力)1,3,5 ; Zhou SB(周曙白)1
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2005
卷号	5 期号:5 页码:463-470
关键词	galaxies : active galaxies : nuclei galaxies : fundamental parameters
ISSN号	1009-9271
通讯作者	Xie, GZ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Black 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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	BL-LACERTAE OBJECTS ; ACTIVE GALACTIC NUCLEI ; RAY-LOUD BLAZARS ; LAC OBJECTS ; EVOLUTIONARY SEQUENCE ; LUMINOSITY RELATIONS ; ACCRETION ; GALAXIES ; EMISSION ; QUASARS
收录类别	SCI
原文出处	http://iopscience.iop.org/1009-9271/5/5/004/
语种	英语
WOS记录号	WOS:000232872000004
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6995]
专题	云南天文台_星系研究组
作者单位	1.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
推荐引用方式 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.,...&Zhou SB.(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.