A photometric and spectroscopic survey of quasars to B = 22.5

Details A photometric and spectroscopic survey of quasars to B = 22.5 A photometric and spectroscopic survey of quasars to B = 22.5

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..240k&link_type=abstract

IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr

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16

Astronomical Photometry, Astronomical Spectroscopy, Quasars, Luminosity, Lyman Spectra, Red Shift

Scientific paper

The present counts of 72 quasar candidates to B = 22.5 in an area of 1000 square arc minutes at the North Galactic Pole (SA57) confirm previous numbers in another field (SA68). The low counts alone exclude a pure density evolution model, but are consistent with a pure luminosity evolution picture. Spectra are now available for 29 candidates with B less than 21.5 and for 29 with B between 21.5 and 22.5. The lack of high redshifts in the latter sample is inconsistent with the extrapolations of either the pure luminosity evolution model or the luminosity-dependent density evolution model of Schmidt and Green (1982). If a low-density Friedmann universe is assumed, the resultant luminosity functions suggest, instead, a more complex scenario in which the universe at earlier times possessed fewer but brighter quasars.

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