Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..482b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 482-507.
Astronomy and Astrophysics
Astronomy
72
Faint Objects, Quasars, Sky Surveys (Astronomy), Astronomical Spectroscopy, Horizontal Branch Stars, Subdwarf Stars, White Dwarf Stars
Scientific paper
This study presents the positions, magnitudes, and identifications of a complete sample of 236 faint (not more than about 22 mag) stellar objects based on spectroscopic observations of multicolor selected samples from deep photographic plates. A total of 93 percent of the complete samples was identified and unambiguous redshifts were obtained for 85 percent of the QSOs. The integral surface density of low-redshift QSOs is estimated at 67.6 + or - 8.8 deg, confirming the strong flattening previously observed in the QSO number-magnitude relation at not less than about 19.5 mag. Broad absorption line systems are observed in 5 to 10 percent of the QSOs in which such systems should be detectable. Emission line equivalent widths measured in the present survey are similar to those derived from optically brighter QSO samples.
Boyle Brian J.
Jones Robert L.
Shanks Tom
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