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A UNIQUE X-RAY UNABSORBED SEYFERT 2 GALAXY: IRAS F01475-0740
Huang, Xing-Xing1; Wang, Jun-Xian1; Tan, Ying1; Yang, Huan1; Huang, Ya-Fang2
2011-06-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume734Issue:1
AbstractX-ray unabsorbed Seyfert 2 galaxies appear to have X-ray absorption column densities that are too low (N-H < 10(22) cm(-2)) to explain the absence of broad emission lines in their optical spectra, challenging the standard active galactic nucleus (AGN) unification model. In this Letter, we report Suzaku exposure on the X-ray unabsorbed Seyfert 2 galaxy IRAS F01475-0740, in which a hidden broad-line region was detected through spectropolarimetric observation. The X-ray data show rapid and significant variations on timescales down to 5 ks, indicating that we are viewing its central engine directly. A newly obtained optical spectrum and previous optical/X-ray data suggest that state transition is unlikely in this source. These make IRAS F01475-0740 a very peculiar X-ray unabsorbed Seyfert 2 galaxy which can only be explained by absorption from materials with abnormally high dust-to-gas ratio (by a factor of >4 larger than Galactic). This is in contrast to most AGNs, which typically show dust-to-gas ratios 3-100 times lower than the Galactic.
KeywordGalaxies: Active Galaxies: Seyfert X-rays: Individual (Iras F01475-0740)
DOI10.1088/2041-8205/734/1/L16
Indexed BySCI
Language英语
WOS IDWOS:000293135500016
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7986
Collection应用天文研究部
Affiliation1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Huang, Xing-Xing,Wang, Jun-Xian,Tan, Ying,et al. A UNIQUE X-RAY UNABSORBED SEYFERT 2 GALAXY: IRAS F01475-0740[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,734(1).
APA Huang, Xing-Xing,Wang, Jun-Xian,Tan, Ying,Yang, Huan,&Huang, Ya-Fang.(2011).A UNIQUE X-RAY UNABSORBED SEYFERT 2 GALAXY: IRAS F01475-0740.ASTROPHYSICAL JOURNAL LETTERS,734(1).
MLA Huang, Xing-Xing,et al."A UNIQUE X-RAY UNABSORBED SEYFERT 2 GALAXY: IRAS F01475-0740".ASTROPHYSICAL JOURNAL LETTERS 734.1(2011).
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