Abstract
We present results from a targeted survey undertaken with the 305m Arecibo radiotelescope to detect HI‐line emission from disk galaxies at redshift z>0.16. The targets for the observations, selected from the Sloan Digital Sky Survey database, are non‐interacting disk galaxies in relatively isolated fields. HI profiles of adequate quality for flux and velocity width measurement were obtained for ∼30 galaxies in the redshift range 0.17–0.26 (i.e. 2–3 Gyr lookback time). The HI masses of these objects are 3−8×1010 M⊙. Our results prove, for the first time, the feasibility of single‐dish HI observations above redshift z = 0.2. In particular, this sample includes the highest redshift detections of HI emission from individual galaxies to date.
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