Fe II/Mg II Emission-Line Ratios of QSOs within 0 < z < 5.3
Fe II/Mg II Emission-Line Ratios of QSOs within 0 < z < 5.3
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DOI：
10.1086/324540
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发表时间：
2002-01
期刊：
影响因子：
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通讯作者：
F. Iwamuro;K. Motohara;T. Maihara;M. Kimura;Y. Yoshii;M. Doi
中科院分区：
文献类型：
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作者：
F. Iwamuro;K. Motohara;T. Maihara;M. Kimura;Y. Yoshii;M. Doi
利用安装在斯巴鲁望远镜上的oh -气辉光抑制光谱仪获得了位于4.4 < z < 5.3之间的13个qso的近红外光谱。采用相同的拟合算法对现有数据以及已发表或存档的光谱进行拟合，研究了qso在不同红移处的Fe /Mg II发射在线比。我们发现，从z ~ 5到1.5，Fe /Mg比值呈下降趋势，几乎与它们的光度无关。我们还证实了mgii发射线上的Baldwin效应。
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 ~ 5 to 1.5, almost independent of their luminosities. We also confirmed the Baldwin effect on the Mg II emission line.