Wide‐Field Imaging of Hubble Deep Field–South Region. I. Quasar Candidates

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Abstract
We present candidate quasars from a multicolor (uBVRI + narrowband) imaging survey of square degree around the Hubble Deep Field-South (HDF-S). We identify 154 candidate quasars with B < 23 using color selection, consistent with previously measured QSO number counts if we assume a 60% selection efficiency. The narrowband filter (NB) was centered at 3958 Å to detect Lyα at the redshift of J2233-6033, the HDF-S QSO. We confirm the presence of Lyα nebulosity extending ~12'' around the HDF-S QSO, reported by Bergeron and coworkers. We detect 10 pointlike objects in emission through the NB filter. Of these, seven satisfy our QSO color selection criteria. One of the emission-line objects is a B ~ 20 radio-quiet quasar at z = 1.56, 67 from the line of sight to the HDF-S QSO and ~12'' from the western edge of the WFPC2 deep field.
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