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Spectroscopic CCD surveys for quasars at large redshift. II - A Pfuei transit surveyA CCD transit survey has been carried out with the 200 in. telescope of a strip of sky 5 arcmin wide and 9 hr long. Direct images and slitless spectra of over 43,000 objects were obtained on two successive nights. An automatic search for emission lines of given minimum equivalent width and signal-to-noise ratio yielded 52 candidate sources. Slit spectra revealed that 24 were emission-line galaxies with z less than 0.4 and eight were quasars with 2 between 1.00 and 2.76. The number of quasars detect agrees with that predicted from luminosity function models for z less than 2.9. The models also indicate that between 30 and 62 quasars with z less than 2.9 should have been found in this survey, but none were detected. This result reconfirms that there is a redshift cutoff near or below redshift three. The apparent conflict of this measurement with the known existence of dozens of quasars with redshifts larger than three is discussed.
Document ID
19870036579
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schmidt, Maarten
(Palomar Observatory Pasadena, CA, United States)
Schneider, Donald P.
(Palomar Observatory, Pasadena, CA; Institute for Advanced Study, Princeton NJ, United States)
Gunn, James E.
(Princeton University NJ, United States)
Date Acquired
August 13, 2013
Publication Date
November 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 310
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A23853
Funding Number(s)
CONTRACT_GRANT: NAS5-29225
CONTRACT_GRANT: NSF AST-83-14134
Distribution Limits
Public
Copyright
Other

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