IR 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

Details IR 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 IR 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

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470l..85k&link_type=abstract

Astrophysical Journal Letters v.470, p.L85

Astronomy and Astrophysics

Astronomy

32

Cosmology: Observations, Galaxies: Formation, Galaxies: Evolution, Galaxies: Quasars: Individual Alphanumeric: B1422+231, Cosmology: Gravitational Lensing, Galaxies: Quasars: Emission Lines

Scientific paper

The rest-frame UV-optical (2000--5300 A) 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 B1422+231 have formed much earlier (~1.5 Gyr) than z = 3.6. The first detection of [O III] lambda 5007 in a quasar beyond z = 3 is also reported.

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