Evidence of the link between broad emission line regions and accretion disks in active Galactic nuclei

	Evidence of the link between broad emission line regions and accretion disks in active Galactic nuclei
	Xu, Yun; Cao, Xin-Wu
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2007
卷号	7 期号:1 页码:63-70
关键词	accretion galaxies : active galaxies : theory radiation mechanisms : emission lines black hole physics accretion disks
英文摘要	There is observational evidence that broad-line regions (BLRs) exist in most active galactic nuclei (AGNs), but their origin is still unclear. One scenario is that the BLRs originate from winds accelerated from the hot coronae of the disks, and the winds are suppressed when the black hole is accreting at low rates. This model predicts a relation between rh (m = M/M-Edd) and the FWHM of broad emission lines. We estimate the central black hole masses for a sample of bright AGNs by using their broad H-beta line-widths and optical luminosities. The dimensionless accretion rates m = M/M-Edd are derived from the optical continuum luminosities by using two different models: using an empirical relation between the bolometric luminosity L-bol and the optical luminosity (m = L-bol/L-Edd, a fixed radiative efficiency is adopted); and calculating the optical spectra of accretion disks as a function of m. We find a significant correlation between the derived m and the observed line width of H-beta, FWHM alpha m(-0.37), which almost overlaps the disk-corona model calculations, if the viscosity alpha approximate to 0.1-0.2 is adopted. Our results provide strong evidence for the physical link between the BLRs and accretion disks in AGNs.
学科主题	星系与宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ULTRALUMINOUS INFRARED GALAXIES ; OPTICAL FLUX RATIO ; SEYFERT-2 GALAXIES ; BLACK-HOLES ; BINARY-SYSTEMS ; QUASARS ; INSTABILITY ; SEARCH ; SAMPLE ; MODELS
收录类别	SCI
语种	英语
WOS记录号	WOS:000244675200003
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/12457]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xu, Yun,Cao, Xin-Wu. Evidence of the link between broad emission line regions and accretion disks in active Galactic nuclei[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2007,7(1):63-70.
APA	Xu, Yun,&Cao, Xin-Wu.(2007).Evidence of the link between broad emission line regions and accretion disks in active Galactic nuclei.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,7(1),63-70.
MLA	Xu, Yun,et al."Evidence of the link between broad emission line regions and accretion disks in active Galactic nuclei".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 7.1(2007):63-70.