Feii/MgiiEmission‐Line Ratios of QSOs within 0 <z< 5.3

Open Access

20 January 2002

journal article
research article
Published by American Astronomical Society in The Astrophysical Journal

Vol. 565 (1) , 63-77
https://doi.org/10.1086/324540

Abstract

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.

Keywords

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