Spectroscopic survey of QSOs to B = 22.5 - The luminosity function

Details Spectroscopic survey of QSOs to B = 22.5 - The luminosity function Spectroscopic survey of QSOs to B = 22.5 - The luminosity function

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325...92k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 92-102.

Astronomy and Astrophysics

Astrophysics

156

Astronomical Spectroscopy, Intergalactic Media, Luminosity, Quasars

Scientific paper

The faint end of the luminosity function for QSOs is estimated from a spectroscopic sample complete to B = 21.1 and unbiased to B = 22.6, the faintest survey so far. The fainter part of the luminosity function can be described as a power law that does not change with redshift. The turnover to a steeper slope occurs at high luminosity at higher redshift. The dependence on redshift of this feature in the luminosity-surface density diagram is continuous; no evidence is seen for a cutoff in redshift at any luminosity. A new model for the evolution is proposed that adequately describes the data for z greater than one. The emissivity due to QSOs is determined as a function of redshift, and it is shown that, under conventional assumptions, the observed QSOs cannot explain the level of ionization of the intergalactic medium implied by the Gunn-Peterson test.

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