Jet formation in BL Lacertae objects with different accretion modes

	Jet formation in BL Lacertae objects with different accretion modes
	Cao, XW
刊名	ASTROPHYSICAL JOURNAL
	2003-12-10
卷号	599 期号:1 页码:147-154
关键词	accretion black hole physics BL Lacertae objects : general galaxies : active galaxies : jets accretion disks
英文摘要	We estimate the masses of massive black holes in BL Lac objects from their host galaxy luminosity. The power of jets and central optical ionizing luminosity for a sample of BL Lac objects are derived from their extended radio emission and the narrow-line emission, respectively. The maximal jet power that can be extracted from a standard thin accretion disk/spinning black hole is calculated as a function of dimensionless accretion rate (m) over dot ((m) over dot = (M) over dot/(M) over dot (Edd)). Comparing with the derived jet power, we find that the accretion disks in most BL Lac objects should not be standard accretion disks. For a pure advection-dominated accretion flow (ADAF), there is an upper limit on its optical continuum luminosity because of the existence of an upper limit (m) over dot(crit) on the accretion rate. It is found that a pure ADAF is too faint to produce the optical ionizing luminosity of BL Lac objects derived from their narrow-line luminosity. We propose that an ADAF is present in the inner region of the disk, and it becomes a standard thin disk in the outer region in most BL Lac objects, i.e., ADAF+SD (standard disk) scenario. This ADAF+SD scenario can explain both the jet power and optical ionizing continuum emission of these BL Lac objects. The inferred transition radii between the inner ADAF and outer SD are in the range of 40-150 GM(bh)/c(2), if the disks are accreting at the rate (m) over dot = 0.01.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; ADVECTION-DOMINATED ACCRETION ; SPECTRAL ENERGY-DISTRIBUTIONS ; STELLAR VELOCITY DISPERSION ; EXTRAGALACTIC RADIO-SOURCES ; BLANDFORD-ZNAJEK MECHANISM ; BLACK-HOLE MASS ; COMPLETE SAMPLE ; ELECTROMAGNETIC EXTRACTION ; OPTICAL SPECTROSCOPY
收录类别	SCI
语种	英语
WOS记录号	WOS:000187149600013
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/12479]
专题	上海天文台_星系宇宙学重点实验室
作者单位	Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Cao, XW. Jet formation in BL Lacertae objects with different accretion modes[J]. ASTROPHYSICAL JOURNAL,2003,599(1):147-154.
APA	Cao, XW.(2003).Jet formation in BL Lacertae objects with different accretion modes.ASTROPHYSICAL JOURNAL,599(1),147-154.
MLA	Cao, XW."Jet formation in BL Lacertae objects with different accretion modes".ASTROPHYSICAL JOURNAL 599.1(2003):147-154.