Infrared spectroscopy of high-redshift quasars

Abstract
We present H and K spectra (showing redshifted Hα, Hβ and [O III] emission lines) of three radio-loud and three radio-quiet quasars with redshifts z ≳ 2, which were obtained using CGS4 on UKIRT. The [O III] λλ4959 + 5007 lines are too weak to allow accurate determination of the redshift of the forbidden lines. The observed Balmer decrements are consistent with enhancement of Hα due to collisional excitation.

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