NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T10:30:59 PDT
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For refcode 2011ApJ...730..121W:
Retrieve 120 NED objects in this reference.
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2011ApJ...730..121W The Different Nature of Seyfert 2 Galaxies With and Without Hidden Broad-line Regions Wu, Yu-Zhong; Zhang, En-Peng; Liang, Yan-Chun; Zhang, Cheng-Min; Zhao, Yong-Heng Abstract. We 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. Key words: galaxies: active, galaxies: Seyfert, galaxies: statistics
Retrieve 120 NED objects in this reference.
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