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Fe II/Mg II Emission-Line Ratios of QSOs within 0 <z < 5.3

被引：53
作者：
Iwamuro, F [1 ]
Motohara, K
Maihara, T
Kimura, M
Yoshii, Y
Doi, M
机构：
[1] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[2] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
[3] Kyoto Univ, Dept Astron, Kyoto 6068502, Japan
[4] Univ Tokyo, Sch Sci, Inst Astron, Tokyo 180015, Japan
[5] Univ Tokyo, Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan
来源：
ASTROPHYSICAL JOURNAL | 2002年 / 565卷 / 01期
关键词：
galaxies : active; infrared : general; quasars : emission lines; quasars : general;
D O I：
10.1086/324540
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Near-infrared spectra of 13 QSOs located between 4.4<z<5.3 were obtained by the OH-airglow suppression spectrograph mounted on the Subaru telescope. The Fe II /Mg II emission-line ratios of the QSOs at various redshifts were examined by applying the same fitting algorithm to the present data together with published or archived spectra. We found a trend of a decreasing Fe II /Mg II ratio from z similar to 5 to 1.5, almost independent of their luminosities. We also confirmed the Baldwin effect on the Mg II emission line.
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收藏
页码：63 / 77
页数：15
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