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
学科分类Astronomy & Astrophysics
DOI10.1086/513685
通讯作者Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China
文章类型Review
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.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
原文出处查看原文
语种英语
WOS记录号WOS:000246571300015
引用统计
被引频次:56[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238998
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
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.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
6089.pdf(445KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[王建民]的文章
[张恩鹏]的文章
[Wang, JM]的文章
百度学术
百度学术中相似的文章
[王建民]的文章
[张恩鹏]的文章
[Wang, JM]的文章
必应学术
必应学术中相似的文章
[王建民]的文章
[张恩鹏]的文章
[Wang, JM]的文章
相关权益政策
暂无数据
收藏/分享
文件名: 6089.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。