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Date and Time of the Query: 2019-06-20 T08:52:56 PDT
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For refcode 2013ApJ...768...30Y:
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2013ApJ...768...30Y Testing the Evolutionary Sequence between Hidden Broad-line Region (HBLR) and Non-HBLR Seyfert 2 Galaxies with the 4000 A Break Strengths Yu, Po-Chieh; Huang, Kui-Yun; Hwang, Chorng-Yuan; Ohyama, Youichi Abstract. We compare the 4000 A break (D_n_ (4000)) strength in the central kpc of hidden broad-line region (HBLR) and non-HBLR Seyfert 2 galaxies to investigate the origin of these galaxies. Our results show that the D_n_ (4000) strengths in the nuclear regions of the non-HBLR Seyfert 2 galaxies are larger than those in the HBLR galaxies. We also show that the D_n_ (4000) strength is not related to the morphology of host galaxies. These results imply that the non-HBLR Seyfert 2 galaxies have an older stellar population in nuclear regions than the HBLR galaxies. This suggests that an evolutionary connection might exist between non-HBLR and HBLR Seyfert 2 galaxies. We propose a potential evolutionary scenario and a modified unification model for Seyfert galaxies. In this scheme, Seyfert 1 and HBLR Seyfert 2 galaxies evolve into unabsorbed and absorbed non-HBLR Seyfert 2 galaxies. We also discuss the implications of our results in the hydrogen column density distribution of the non-HBLR Seyfert 2 galaxies. Key words: galaxies: active, galaxies: evolution, galaxies: nuclei, galaxies: Seyfert, Galaxy: stellar content
Retrieve 26 NED objects in this reference.
Please click here for ADS abstract

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