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AN UNOBSCURED TYPE II QUASAR CANDIDATE: SDSS J012032.19-005501.9
Li, Y.1,2; Yuan, W.1; Zhou, H. Y.3,4,5; Komossa, S.1,6,7; Ai, Y. L.8; Liu, W. J.3,4,5; Boisvert, J. H.2
2015-02-01
发表期刊ASTRONOMICAL JOURNAL
卷号149期号:2
摘要We report the finding of an unobscured type II active galactic nucleus (AGN) candidate, SDSS J012032.19-005501.9, at a relatively high redshift of 0.601, which shows a number of unusual properties. It varies significantly on timescales of years, typical of type I AGNs, and marginally on timescales of weeks. The color-magnitude relation and the structure function are also consistent with that of type I AGNs, which implies that its variability likely originates from the black hole accretion system. However, no broad emission line (BEL) is detected in the Sloan Digital Sky Survey spectrum, and the upper limit of the equivalent width of the H beta BEL is much less than that of type I AGNs. These properties suggest that SDSS J012032.19-005501.9 may be an unobscured quasar without intrinsically broad emission lines, namely, an unobscured type II AGN or "true" type II AGN. Furthermore, its continuum luminosity is at least one order of magnitude fainter than the average value over the past century from the [O III] emission line. This indicates that SDSS J012032.19-005501.9 may be switching off. Additional possible scenarios to explain this intriguing source are also discussed. Future deep observations at multiwavelengths are needed to reveal the nature of this peculiar and intriguing AGN.
关键词Black Hole Physics Galaxies: Active Galaxies: Nuclei Galaxies: Seyfert
DOI10.1088/0004-6256/149/2/75
收录类别SCI
语种英语
WOS记录号WOS:000349360200040
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/6637
专题应用天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
3.Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
4.Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China
5.Polar Res Inst China, Shanghai 200136, Peoples R China
6.Tech Univ Munich, Excellence Cluster Universe, D-85748 Garching, Germany
7.Max Planck Inst Radioastron, D-53121 Bonn, Germany
8.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
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Li, Y.,Yuan, W.,Zhou, H. Y.,et al. AN UNOBSCURED TYPE II QUASAR CANDIDATE: SDSS J012032.19-005501.9[J]. ASTRONOMICAL JOURNAL,2015,149(2).
APA Li, Y..,Yuan, W..,Zhou, H. Y..,Komossa, S..,Ai, Y. L..,...&Boisvert, J. H..(2015).AN UNOBSCURED TYPE II QUASAR CANDIDATE: SDSS J012032.19-005501.9.ASTRONOMICAL JOURNAL,149(2).
MLA Li, Y.,et al."AN UNOBSCURED TYPE II QUASAR CANDIDATE: SDSS J012032.19-005501.9".ASTRONOMICAL JOURNAL 149.2(2015).
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