Infrared spectroscopy of the gravitationally lensed quasar B1422+231: Mg II λ2798 and Fe II emission from the broad-line gas at z = 3.62

Kimiaki Kawara, Takashi Murayama, Yoshiaki Taniguchi, Nobuo Arimoto

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30 Citations (Scopus)

Abstract

The rest-frame UV-optical (2000-5300 Å) 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 n(UV + optical)/Mg II λ2798 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 B1422+231 have formed much earlier (∼1.5 Gyr) than z = 3.6. The first detection of [O II] λ5007 in a quasar beyond z = 3 is also reported.

Original languageEnglish
Pages (from-to)L85-L88
JournalAstrophysical Journal
Volume470
Issue number2 PART II
DOIs
Publication statusPublished - 1996

Keywords

  • Cosmology: observations
  • Galaxies: evolution
  • Galaxies: formation
  • Gravitational lensing
  • Quasars: emission lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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