The unified model of active galactic nuclei. II. Evolutionary connection

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	The unified model of active galactic nuclei. II. Evolutionary connection
	Wang JM(王建民); Zhang EP(张恩鹏); Wang, JM; Zhang, EP
刊名	ASTROPHYSICAL JOURNAL
	2007
卷号	660 期号:2 页码:1072-1092
关键词	accretion, accretion disks black hole physics galaxies : active galaxies : Seyfert polarization stars : formation
通讯作者	Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China
英文摘要	We assemble a sample composed of 243 nearby Seyfert galaxies with redshifts z <= 0.05 to test the unification scheme. The sample contains 94 broad emission line Seyfert 1 galaxies (BLS1s), 44 narrow emission line Seyfert 1s (NLS1s), 36 X-ray-absorbed hidden broad line region Seyfert 2s (HBLR S2s), 42 X-ray-absorbed non-HBLR S2s, and 27 X-ray-unabsorbed Seyfert 2s (unabsorbed non-HBLR S2s and HBLR S2s). We find that (1) NLS1s have less massive black hole masses than BLS1s, (2) HBLR S2s have the same mass distribution of black holes as BLS1s, (3) absorbed non-HBLR S2s have less massive black holes than HBLR S2s, and (4) unabsorbed non-HBLR S2s have the most massive black holes. We thus have a queue of black hole masses from small to large: narrow- to broad-line Seyfert galaxies, providing new evidence for the evolutionary sequence. We find that the opening angles of the torus in NLS1s and absorbed non-HBLR S2s are significantly smaller than those in BLS1s and HBLR S2s. We also find that the unabsorbed Seyfert 2 galaxies could be caused by low gas-to-dust ratios in the present sample. This indicates that the star formation histories could be different in the unabsorbed and absorbed Seyfert 2 galaxies, showing evidence for suppressed star formation by black hole activities. We outline a new unification scheme based on the orientation hypothesis: Seyfert galaxies can be unified by including the growth of black holes, Eddington ratios, changing opening angles of tori, and gas- to- dust ratios in tori. Seyfert galaxies tend to finally evolve to unabsorbed non-HBLR Seyfert 2 galaxies, in which the black holes accrete with low accretion rates and both the broad- line region and dusty torus disappear.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000246571300015
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238998]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wang JM,Zhang EP,Wang, JM,et al. The unified model of active galactic nuclei. II. Evolutionary connection[J]. ASTROPHYSICAL JOURNAL,2007,660(2):1072-1092.
APA	王建民,张恩鹏,Wang, JM,&Zhang, EP.(2007).The unified model of active galactic nuclei. II. Evolutionary connection.ASTROPHYSICAL JOURNAL,660(2),1072-1092.
MLA	王建民,et al."The unified model of active galactic nuclei. II. Evolutionary connection".ASTROPHYSICAL JOURNAL 660.2(2007):1072-1092.