Current QSO statistics - Implications for the intergalactic medium

Details Current QSO statistics - Implications for the intergalactic medium Current QSO statistics - Implications for the intergalactic medium

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..365s&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 365-368.

Astronomy and Astrophysics

Astrophysics

14

Cosmology, Galactic Evolution, Intergalactic Media, Quasars, Density (Number/Volume), Emission Spectra, Far Ultraviolet Radiation, Gas Ionization, Luminosity

Scientific paper

The results of numerous QSO surveys have been compiled and analyzed to form a single spatially averaged QSO ionizing function that is independent of evolution mode (number density or luminosity). An intergalactic medium (IGM) that satisfies the observational constraints may now have a density with respect to closure of approximately 0.1, which is substantially less than hitherto modeled. The aggregate of QSO data also indicate that if evolution is due to number density, then, when split into luminosity classes, an exponential in look-back time fits the data better than a power law, and the evolution rates increase roughly with absolute luminosity if analyzed by the exponential.

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