Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15..267s&link_type=abstract
Publications Astronomical Society of Australia, vol. 15, no. 3, p. 267-272
Astronomy and Astrophysics
Astronomy
1
Cosmology, Early Universe, Quasars
Scientific paper
We present the identifications of two z ~ 3.8 quasars from a deep UBI imaging survey with the Palomar 5.1-m. The survey covers an area of 0.25 sq. degrees around a sample of ten 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-alpha 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-alpha system, or more likely a blend of a number of high column-density absorbers spread over a distance of approximately 10 Mpc.
Edge Alastair C.
Ellis Richard S.
Smail Ian
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