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Spectroscopic properties of QSOs selected from ultraluminous infrared galaxy samples
Zheng, XZ; Xia, XY; Mao, S; Wu, H; Deng, ZG
2002-07-01
发表期刊ASTRONOMICAL JOURNAL
卷号124期号:1页码:18-32
摘要We performed spectroscopic observations for a large infrared quasi-stellar object (QSO) sample with a total of 25 objects. The sample was compiled from the QDOT redshift survey, the 1 Jy ultraluminous IRAS galaxy survey, and a sample obtained by a cross-correlation study of the IRAS Point-Source Catalogue with the ROSAT All-Sky Survey Catalogue. Statistical analyses of the optical spectra show that the vast majority of infrared QSOs have narrow permitted emission lines ( with FWHM of Hbeta less than 4000 km s(-1)) and more than 60% of them are luminous narrow-line Seyfert 1 galaxies. Two of the infrared QSOs are also classified as low-ionization broad absorption line ( lo-BAL) QSOs. More than 70% of infrared QSOs are moderately or extremely strong Fe II emitters. This is the highest percentage of strong Fe II emitters in all subclasses of QSO Seyfert 1 samples. We found that the Fe II to H line ratio is significantly correlated with the [O III lambda5007 peak and Hbeta blueshift. Soft X-ray weak infrared QSOs tend to have large blueshifts in permitted emission lines and significant Fe II 48, 49 (5100-5400 Angstrom) residuals relative to the Boroson & Green Fe II template. If the blueshifts in permitted lines are caused by outflows, then they appear to be common in infrared QSOs. As the infrared-selected QSO sample includes both luminous narrow-line Seyfert 1 galaxies and lo-BAL QSOs, it could be a useful laboratory to investigate the evolutionary connection among these objects.
关键词Galaxies : Seyfert Quasars : Emission Lines Quasars : General
收录类别SCI
语种英语
WOS记录号WOS:000176272900002
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8540
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Tianjin Normal Univ, Dept Phys, Tianjin 300074, Peoples R China
3.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
4.Chinese Acad Sci, Grad Sch, Dept Phys, Beijing 100080, Peoples R China
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GB/T 7714
Zheng, XZ,Xia, XY,Mao, S,et al. Spectroscopic properties of QSOs selected from ultraluminous infrared galaxy samples[J]. ASTRONOMICAL JOURNAL,2002,124(1):18-32.
APA Zheng, XZ,Xia, XY,Mao, S,Wu, H,&Deng, ZG.(2002).Spectroscopic properties of QSOs selected from ultraluminous infrared galaxy samples.ASTRONOMICAL JOURNAL,124(1),18-32.
MLA Zheng, XZ,et al."Spectroscopic properties of QSOs selected from ultraluminous infrared galaxy samples".ASTRONOMICAL JOURNAL 124.1(2002):18-32.
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