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

September 2000 • 2000ApJ...541...61P

Authors • Palunas, Povilas • Collins, Nicholas R. • Gardner, Jonathan P. • Hill, Robert S. • Malumuth, Eliot M. • Smette, Alain • Teplitz, Harry I. • Williger, Gerard M. • Woodgate, Bruce E.

Abstract • We present candidate quasars from a multicolor (uBVRI+narrowband) imaging survey of 1/2 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, 6.7‧ from the line of sight to the HDF-S QSO and ~12" from the western edge of the WFPC2 deep field. Based on observations obtained at Cerro Tololo Inter-American Observatory, a division of the National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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Harry Teplitz

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