The high surface density of bright ultraviolet-excess quasars

Details The high surface density of bright ultraviolet-excess quasars The high surface density of bright ultraviolet-excess quasars

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256p..65g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 4, June 15, 1992, p. 65P-68P. Research support

Mathematics

Logic

86

Quasars, Radiant Flux Density, Stellar Luminosity, Surface Properties, Ultraviolet Radiation, Cosmology, Red Shift

Scientific paper

The surface density of bright (B less than 16.5) UVX quasars in the recently completed Edinburgh quasar survey, and have found a higher density, by a factor of 3.4, than has previously been measured. The surface density of quasars brighter than B = 16.50 is 0.024 sq deg in this survey, and the gradient of the differential log (number)-magnitude relation for quasars brighter than B = 17.7 has decreased from 0.98 to 0.78. Future work is expected to show that new models of the optical luminosity function for luminous quasars will need a smaller amount of cosmological evolution, more comparable to that seen at radio wavelengths.

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