THE HIGH-EFFICIENCY JETS MAGNETICALLY ACCELERATED FROM A THIN DISK IN POWERFUL LOBE-DOMINATED FRII RADIO GALAXIES

	THE HIGH-EFFICIENCY JETS MAGNETICALLY ACCELERATED FROM A THIN DISK IN POWERFUL LOBE-DOMINATED FRII RADIO GALAXIES
	Li, Shuang-Liang 1,2,3
刊名	ASTROPHYSICAL JOURNAL
	2014-06-10
卷号	788 期号:1 页码:71-76
关键词	accretion galaxies : active galaxies : jets galaxies : magnetic fields accretion disks
通讯作者	李双良
英文摘要	A maximum jet efficiency line R similar to 25 (R = L-jet/L-bol), found in FRII radio galaxies by Fernandes et al., was extended to cover the full range of jet power by Punsly. Recent general relativistic magnetohydrodynamic simulations of jet formation have mainly focused on the enhancement of jet power. In this work, we suggest that the jet efficiency could be very high even for conventional jet power if the radiative efficiency of disks was much smaller. We adopt the model of a thin disk with magnetically driven winds to investigate the observational high-efficiency jets in FRII radio galaxies. It is found that the structure of a thin disk can be significantly altered by the feedback of winds. The temperature of a disk gradually decreases with increasing magnetic field; the disk density, surface density, and pressure also change enormously. The lower temperature and higher surface density in the inner disk result in the rapid decrease of radiative efficiency. Thus, the jet efficiency is greatly improved even if the jet power is conventional. Our results can explain the observations quite well. The theoretical maximum jet efficiency of R similar to 1000 suggested by our calculations is large enough to explain all of the high jet efficiency in observations, even considering the episodic activity of jets.
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 ; BLACK-HOLES ; ACCRETION DISKS ; MAGNETOHYDRODYNAMIC SIMULATIONS ; ELECTROMAGNETIC EXTRACTION ; DRIVEN ; FLOWS ; FIELD ; ENERGY ; CONSTRAINTS
收录类别	SCI
语种	英语
WOS记录号	WOS:000337095200071
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15778]
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, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA 3.NIST, Boulder, CO 80309 USA
推荐引用方式 GB/T 7714	Li, Shuang-Liang. THE HIGH-EFFICIENCY JETS MAGNETICALLY ACCELERATED FROM A THIN DISK IN POWERFUL LOBE-DOMINATED FRII RADIO GALAXIES[J]. ASTROPHYSICAL JOURNAL,2014,788(1):71-76.
APA	Li, Shuang-Liang.(2014).THE HIGH-EFFICIENCY JETS MAGNETICALLY ACCELERATED FROM A THIN DISK IN POWERFUL LOBE-DOMINATED FRII RADIO GALAXIES.ASTROPHYSICAL JOURNAL,788(1),71-76.
MLA	Li, Shuang-Liang."THE HIGH-EFFICIENCY JETS MAGNETICALLY ACCELERATED FROM A THIN DISK IN POWERFUL LOBE-DOMINATED FRII RADIO GALAXIES".ASTROPHYSICAL JOURNAL 788.1(2014):71-76.