Spectroscopic CCD surveys for quasars at large redshift. I - A deep PFUEI survey

Details Spectroscopic CCD surveys for quasars at large redshift. I - A deep PFUEI survey Spectroscopic CCD surveys for quasars at large redshift. I - A deep PFUEI survey

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..411s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 411-427.

Astronomy and Astrophysics

Astrophysics

78

Astronomical Spectroscopy, Quasars, Red Shift, Astronomical Photometry, Charge Coupled Devices, Luminosity, Magnitude, Spectral Line Width

Scientific paper

A survey for faint quasars has been conducted using slitless spectroscopy with the PFUEI at the 200 inch (5 m) telescope. The survey covers a total of 0.91 sq deg in 113 fields at galactic latitudes above 30 deg. Calibrated spectra in the range 4500-7200 A were obtained for more than 9000 objects. Emission-line candidates were selected on the basis of two criteria: the equivalent width must exceed 50 A, and the signal-to-noise ratio of the detection of the line versus the sky background should be larger than 7. Among 45 candidates so selected, subsequent slit spectroscopy confirmed 27 emission-line objects. Among these, 17 are emission-line galaxies with redshifts in the range 0.04-0.31, and 10 are quasars with redshifts between 0.91 and 2.66. The well-defined selection criteria for these objects, together with the distribution of rest frame equivalent widths of the emission lines, allow derivation of the area of sky covered as a function of the continuum limiting magnitude. The observed number of quasars in the redshift range 0.7-2.7 agrees well with that predicted by the luminosity function models published by Schmidt and Green in 1983. It is concluded that quasars with an absolute magnitude of M(B) = -25 suffer a redshift cutoff near or below a redshift of 3.

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