Abstract
The optical spectrum of the radio source 1309 – 216 is shown to consist of a non-thermal continuum with no emission features but with strong C IV absorption at redshifts 1.361, 1.489 and 1.491. In the strongest absorption system (za = 1.489) Si II and Si IV are also detected. There is some evidence for optical variability and the most plausible classification is as a BL Lac object. The absorption lines have intrinsic FWHM ranging from 150 to 325 km s–1. This absorption could arise either in material ejected from a central source or in highly ionized gas in the haloes of intervening galaxies, but not in material typical of interstellar H I clouds.
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