The unified model of active galactic nuclei. I. Non hidden broad-line region Seyfert 2 and narrow-line Seyfert 1 galaxies
Zhang EP(张恩鹏); Wang JM(王建民); Zhang, EP; Wang, JM
刊名ASTROPHYSICAL JOURNAL
2006
卷号653期号:1页码:#REF!
关键词galaxies : active galaxies : Seyfert polarization
学科分类Astronomy & Astrophysics
DOI10.1086/506515
通讯作者Wang, JM (reprint author), Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100039, Peoples R China.
文章类型Review
英文摘要The unified model of Seyfert galaxies suggests that there are hidden broad-line regions (HBLRs) in Seyfert 2 galaxies (S2s). However, there is increasing evidence for the appearance of a subclass of S2s lacking HBLRs (non-HBLR S2s). An interesting issue arises as to the relations of non-HBLR S2s with other types of Seyfert galaxies and whether or not they can be included in the unified model. We assemble two subsamples consisting of 42 non-HBLR S2s and 44 narrow-line Seyfert 1 galaxies (NLS1s) with redshift z <= 0.05 from published literatures to explore this issue. We compare black hole masses in the galactic centers, accretion rates, and infrared color ratio (f(60 mu m)/f(25 mu m)) as a potential indicator of the dusty torus orientation, [0 III] lambda 5007, radio, and far-infrared luminosities. We find that non-HBLR S2s and NLS1s have (1) similar distributions of black hole masses [(0.1-3) X 10(7) M circle dot] and Eddington ratios (L(Bol)/L(Edd) similar to 1); (2) significantly different distributions f(60 mu m)/f(25 mu m) ratios; and (3) similar distributions of bulge magnitudes and luminosities of [O III], radio, and far-infrared emission. The similarities and differences can be understood naturally if they are intrinsically the same, but non-HBLR S2s are viewed at larger angles of the observer's sight than NLS1s. We thus suggest that non-HBLR S2s only have "narrower" broad-line regions and that they are the counterparts of NLS1s viewed at high inclination angles. The absence of the polarized emission line in non-HBLR S2s is caused by the less massive black holes and high accretion rate similar to NLS1s. The implications of the unification scheme of non-HBLR S2s and NLS1s are discussed.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000242913800010
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被引频次:41[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/311005/226416
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
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Zhang EP,Wang JM,Zhang, EP,et al. The unified model of active galactic nuclei. I. Non hidden broad-line region Seyfert 2 and narrow-line Seyfert 1 galaxies[J]. ASTROPHYSICAL JOURNAL,2006,653(1):#REF!.
APA 张恩鹏,王建民,Zhang, EP,&Wang, JM.(2006).The unified model of active galactic nuclei. I. Non hidden broad-line region Seyfert 2 and narrow-line Seyfert 1 galaxies.ASTROPHYSICAL JOURNAL,653(1),#REF!.
MLA 张恩鹏,et al."The unified model of active galactic nuclei. I. Non hidden broad-line region Seyfert 2 and narrow-line Seyfert 1 galaxies".ASTROPHYSICAL JOURNAL 653.1(2006):#REF!.
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