The identification of two ztex2html_wrap_inline2963.8 QSOs
in a deep CCD survey

Ian Smail, Alastair C. Edge, Richard S. Ellis, PASA, 15 (3), 267
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The identification of two ztex2html_wrap_inline2963.8 QSOs
in a deep CCD survey

Ian Smailtex2html_wrap_inline298
Alastair C. Edgetex2html_wrap_inline300
Richard S. Ellistex2html_wrap_inline302

tex2html_wrap_inline304 School of Physics, University of New South Wales, Sydney 2052
tex2html_wrap_inline300 Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK
tex2html_wrap_inline302 Institute of Astronomy, Madingley Rd, Cambridge CB3 0HA, UK


We present the identifications of two tex2html_wrap_inline310 quasars from a deep tex2html_wrap_inline312 imaging survey with the Palomar 5.1-m. The survey covers an area of 0.25 sq. degrees around a sample of 10 z=0.2-0.3 luminous X-ray clusters. The QSOs were identified on the basis of their stellar morphologies, relatively blue optical and very red UV-optical colours. The two objects are Q1322+5034 with total magnitudes of B=20.8, I=18.3 and (U-B)>4.7; and Q1722+3211 which has total magnitudes of B=21.8, I=19.7 and (U-B)>3.2. Subsequent spectroscopic observations with the 4.2-m William Herschel Telescope have confirmed the identity of these two sources as QSO at z=3.82 and z=3.73 respectively. Our spectroscopic observations identify a damped Lyman-tex2html_wrap_inline332 absorber in the spectrum of Q1322+5034 at z=3.439, as well as a second absorption system at z=2.700 which may either be a single very high column-density damped Lyman-tex2html_wrap_inline332 system, or more likely a blend of a number of high column-density absorbers spread over a distance of tex2html_wrap_inline340 Mpc.

Keywords: cosmology: observations -- cosmology: early universe -- quasars: clusters - individual A1758; A2261

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