The evolution of the quasar luminosity function

Details The evolution of the quasar luminosity function The evolution of the quasar luminosity function

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275.1102h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 4, pp. 1102-1116.

Astronomy and Astrophysics

Astronomy

46

Galaxies: Luminosity Function, Mass Function, Quasars: General

Scientific paper

In an earlier paper we presented quasar luminosity functions in three redshift bins, derived from a variability selected sample. Here we provide a major extension to this survey, with a view to improving statistics and completeness, and extending the red-shift range. The luminosity functions for redshifts of less than 2.2 show a featureless power law of the form phi=10^beta(M-M0), with no sign of a `break'. The quasar luminosity function is also derived for the redshift range 2.2<z<3.2, which again shows a featureless power law, but with a steeper slope. When the data are combined with a new sample of bright quasars, the quasar luminosity functions in all four redshift ranges are consistent with a single power law of index beta=0.63. Plots of quasar space density as a function of redshift in three luminosity bins are also presented and show strong evolution at low redshift, but nearly constant space density beyond a redshift of 2.

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