Space density evolution of quasars

Details Space density evolution of quasars Space density evolution of quasars

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..163s&link_type=abstract

Nature, vol. 276, Nov. 9, 1978, p. 163-165.

Mathematics

Logic

9

Cosmology, Quasars, Space Density, Astronomical Models, Data Sampling, Luminous Intensity, Red Shift

Scientific paper

The apparent large spread in quasar luminosities has thwarted attempts to obtain interesting cosmological information from the study of quasars. Little work has apparently been done on using the (M, log z) plot as a cosmological indicator, in place of the Hubble diagram. It is shown that although evolution may be zero, the uncertainty in the quasar luminosity function allows an upper limit on the quasar space density. It has been suggested by Schmidt (1976) that steep and flat radio-spectrum quasars differ in evolutionary properties, and the considered approach should be able to discriminate between the two species on those grounds, provided a good enough sample of data can be acquired. It is found that previous determinations of quasar space density are subject to a statistical sampling effect depending on space volume.

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