Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-21
Astrophys.J. 117 (1999) 1645-1650
Astronomy and Astrophysics
Astrophysics
5 pages, 1 table, 4 figures. To appear in The Astronomical Journal
Scientific paper
10.1086/300799
We present new near-infrared (rest-frame UV-to-optical) spectra of the high redshift, gravitationally lensed quasar B 1422+231 (z=3.62). Diagnostic emission lines of FeII, [OIII]5007, and Hb, commonly used to determine the excitation, ionization, and chemical abundances of radio-quiet and radio-loud quasars, were detected. Our new data show that the ratio FeII(UV)/Hb=18.1+-4.6 and FeII(optical)/Hb=2.3+-0.6 are higher than those reported by Kawara et al. (1996) by factors of 1.6 and 3.3, respectively, although the ration [OIII]5007/Hb=0.19+-0.02 is nearly the same between the two measurements. The discrepancy of the line flux ratios between the measurements is likely due to improved data and fitting procedures rather that to intrinsic variability. While approximately half of the high-z quasars observed to date have much more extreme FeII(optical)/Hb ratios, the line ratio measured for B 422+231 are consistent with the observed range of FeII(optical) ratios of low-z quasars.
Arimoto Nobou
Evans Aaron S.
Hodapp Klaus W.
Kawara Kimiaka
Murayama Takashi
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