Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..411g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 411-433. Research supported by the Pennsylvania Sta
Astronomy and Astrophysics
Astrophysics
15
Galactic Evolution, Luminosity, Quasars, Red Shift, Active Galaxies, Emission Spectra, Line Spectra, Magnitude, Stellar Spectrophotometry
Scientific paper
Ten different emission line surveys are presently used as the basis for a study of the luminosity function of quasars with redshifts in the 1.8-2.5 range. The luminosity function exhibits a steep increase with magnitude at high luminosities, and a flattening at intermediate ones. Total volume densities of quasars in the redshift interval in question are calculated for each of three extrapolations of the trend of the present data to low luminosities, and the densities are then compared with those of active galaxies and field galaxies at the present epoch. Since the observed turndown in the luminosity function at the faint end of the distribution implies that there were similar or fewer numbers of quasars at redshifts of about 2.2 than active galaxies now, and far fewer quasars at that epoch than normal galaxies now, quasars were not the predecessors of all galaxies.
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