Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..109m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 109-121.
Astronomy and Astrophysics
Astronomy
84
Luminosity, Quasars, Red Shift, Cosmology, Evolution (Development), Ultraviolet Astronomy
Scientific paper
Several complete samples of optically selected quasars are combined to give details of the quasar luminosity function and its evolution for redshifts less than 2.2. Sufficient coverage of the Hubble diagram is obtained that luminosity-dependent evolution models can be tested and compared against pure luminosity evolution models. Although luminosity-dependent evolution is indicated if the evolution function has an exponential form, the data are consistent with a power-law evolution model that is independent of luminosity. When the sample is split into halves by redshift, a better fit is obtained with a power-law evolution model than with an exponential model. Furthermore, the luminosity function is consistent with a power-law shape whose slope is independent of redshift. The results suggest that the same mass supply and energy generation mechanisms apply over several decades of optical luminosity and for z less than 2.2.
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