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THE DIFFERENT NATURE OF SEYFERT 2 GALAXIES WITH AND WITHOUT HIDDEN BROAD-LINE REGIONS
Wu, Yu-Zhong1,2; Zhang, En-Peng1; Liang, Yan-Chun1; Zhang, Cheng-Min; Zhao, Yong-Heng1
2011-04-01
Source PublicationASTROPHYSICAL JOURNAL
Volume730Issue:2
AbstractWe compile a large sample of 120 Seyfert 2 galaxies (Sy2s) which contains 49 hidden broad-line region (HBLR) Sy2s and 71 non-HBLR Sy2s. From the difference in the power sources between two groups, we test whether HBLR Sy2s are dominated by active galactic nuclei (AGNs) and whether non-HBLR Sy2s are dominated by starbursts. We show that (1) HBLR Sy2s have larger accretion rates than non-HBLR Sy2s; (2) HBLR Sy2s have larger [ Ne v] lambda 14.32/[Ne II] lambda 12.81 and [O IV] lambda 25.89/[ Ne II] lambda 12.81 line ratios than non-HBLR Sy2s; and (3) HBLR Sy2s have smaller IRAS f(60)/f(25) flux ratios, which show the relative strength of the host galaxy and nuclear emission, than non-HBLR Sy2s. Consequently, we suggest that HBLR Sy2s and non-HBLR Sy2s are AGN dominated and starburst dominated, respectively. In addition, non-HBLR Sy2s can be classified into luminous (L-[O III] > 10(41) erg s(-1)) and less luminous (L-[O III] < 10(41) erg s(-1)) samples, when considering only their obscuration. We suggest that (1) the invisibility of polarized broad lines (PBLs) in the luminous non-HBLR Sy2s depends on the obscuration and (2) the invisibility of PBLs in the less luminous non-HBLR Sy2s depends on the very low Eddington ratio rather than the obscuration.
KeywordGalaxies: Active Galaxies: Seyfert Galaxies: Statistics
DOI10.1088/0004-637X/730/2/121
Indexed BySCI
Language英语
WOS IDWOS:000288441900061
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7869
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wu, Yu-Zhong,Zhang, En-Peng,Liang, Yan-Chun,et al. THE DIFFERENT NATURE OF SEYFERT 2 GALAXIES WITH AND WITHOUT HIDDEN BROAD-LINE REGIONS[J]. ASTROPHYSICAL JOURNAL,2011,730(2).
APA Wu, Yu-Zhong,Zhang, En-Peng,Liang, Yan-Chun,Zhang, Cheng-Min,&Zhao, Yong-Heng.(2011).THE DIFFERENT NATURE OF SEYFERT 2 GALAXIES WITH AND WITHOUT HIDDEN BROAD-LINE REGIONS.ASTROPHYSICAL JOURNAL,730(2).
MLA Wu, Yu-Zhong,et al."THE DIFFERENT NATURE OF SEYFERT 2 GALAXIES WITH AND WITHOUT HIDDEN BROAD-LINE REGIONS".ASTROPHYSICAL JOURNAL 730.2(2011).
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