Testing the evolutionary sequence between hidden broad-line region (HBLR) and non-Hblr Seyfert 2 galaxies with the 4000 � break strengths

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题名:	Testing the evolutionary sequence between hidden broad-line region (HBLR) and non-Hblr Seyfert 2 galaxies with the 4000 � break strengths
作者:	俞伯傑;Yu, Po-Chieh;Huang, Kui-Yun;Hwang, Chorng-Yuan;Ohyama, Youichi
贡献者:	理學院天文研究所
关键词:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Breaking;DENSITY;DISTRIBUTION;EVOLUTION;Evolutionary;Galactic evolution;Galaxies;GALAXY NUCLEI;HYDROGEN;MORPHOLOGY;Origins;SEYFERT GALAXIES;Stellar populations;Strength;TESTING
日期:	2013-05-01
上传时间:	2026-04-21 14:20:11 (UTC+8)
出版者:	IOP Publishing Ltd.;United States
摘要:	摘要： We compare the 4000 [Angstrom] break (Dn(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 Dn(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 Dn(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. 出版者： United States 出版日期： 2013-05-01 出處： The Astrophysical journal, 2013-05, Vol.768 (1), p.30-6 資源來源： Institute of Physics Journals 識別號： ISSN: 0004-637X 識別號： ISSN: 1538-4357 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/768/1/30
显示于类别:	[天文研究所] 期刊論文

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