The space density of quasars at z>4

Details The space density of quasars at z>4 The space density of quasars at z>4

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..348h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 348-356.

Astronomy and Astrophysics

Astronomy

25

Surveys, Quasars: General, Cosmology: Observations

Scientific paper

This paper describes the first results from a survey for faint quasars based on a digital stack of 170 1.2-m Schmidt telescope plates. The limiting magnitude of R=23 with variability measures to R=21 over 19 deg^2 allows the measurement of space density to a redshift of z=4.5. After an initial steep rise to z=1.5, the space density relation flattens, and then declines gradually beyond z=3. The quasar luminosity function for 3.0

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