Near-Infrared Spectroscopy of the High Redshift Quasar S4 0636+68 at z=3.2

Details Near-Infrared Spectroscopy of the High Redshift Quasar S4 0636+68 at z=3.2 Near-Infrared Spectroscopy of the High Redshift Quasar S4 0636+68 at z=3.2

1998-03-10

arxiv.org/abs/astro-ph/9803102v1

Astron.J. 115 (1998) 2237-2243

Astronomy and Astrophysics

Astrophysics

11 pages (aaspp4.sty), 3 tables (aj_pt4.sty), and 6 postscript figures. To appear in the Astronomical Journal

Scientific paper

10.1086/300352

We present near-infrared (observed frame) spectra of the high-redshift quasar S4 0636+68 at z=3.2 which was previously thought to be one of a group of ``strong'' Fe II emitters [i.e., F(Fe II 4434-4684)/F(Hbeta) > 1]. Our K-band spectrum clearly shows emission lines of Hbeta and [O III]4959, 5007 as well as optical Fe II emission. Our computed value of F(Fe II 4434-4684)/F(Hbeta) ~ 0.8 for S4 0636+68 is less than previously thought, and in fact is comparable to values found for radio-loud, flat-spectrum, low-z quasars. Therefore S4 0636+68 appears not to be a strong optical Fe II emitter. Although more than half (5/8) of the high-z quasars observed to date are still classified as strong optical Fe II emitters, their Fe II/Hbeta ratios, for the most part, follow the same trend as that of low-$z$ quasars, i.e., an anticorrelation in EW(Fe II)/EW(Hbeta) versus EW([O III])/EW(Hbeta), with radio-loud quasars having a mean value of EW(Fe II)/EW(Hbeta) approximately half that of radio-quiet quasars at comparable values of EW([O III])/EW(Hbeta).

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