Infrared spectroscopy of the gravitationally lensed quasar B1422+231:Mg II lambda 2798 and Fe II emission from the broad-line gas AT z=3.62

被引：38

作者：

Kawara, K

Murayama, T

Taniguchi, Y

Arimoto, N

机构：

[1] INST SPACE & ASTRONAUT SCI,YOSHINODAI,SAGAMIHARA,KANAGAWA 229,JAPAN

[2] TOHOKU UNIV,INST ASTRON,SENDAI,MIYAGI 98077,JAPAN

[3] ROYAL GREENWICH OBSERV,CAMBRIDGE CB3 0EZ,ENGLAND

[4] UNIV TOKYO,INST ASTRON,MITAKA,TOKYO 181,JAPAN

来源：

ASTROPHYSICAL JOURNAL | 1996年 / 470卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmology; observations; galaxies; evolution; formation; gravitational lensing; quasars; emission lines; individual; (B1422+231);

D O I：

10.1086/310315

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The rest-frame UV-optical (2000-5300 Angstrom) spectrum of the gravitationally lensed flat-spectrum radio-loud quasar B1422+231 system at z = 3.62 is presented. The spectrum is similar to the Large Bright Quasar Survey (LBQS) composite spectrum (Francis et al.), which indicates no significant UV-optical spectral evolution in some quasars at 0 < z < 3.6. The Fe II(UV + optical)/Mg II lambda 2798 flux ratio is 12.2 +/- 3.9, which is comparable to 8.9 for the LBQS composite spectrum of quasars at z = 1-2 analyzed in this work, and 7.8 +/- 2.6 for quasars at z = 0.15-0.63 analyzed by Wills, Netzer, & Wills. It is concluded that the majority of stars in the host galaxy of 1422+231 have formed much earlier (similar to 1.5 Gyr) than z = 3.6. The first detection of [O III] lambda 5007 in a quasar beyond z = 3 is also reported.

引用

页码：L85 / L88

页数：4

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