Abstract
view Abstract Citations (15) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Current QSO statistics - Implications for the intergalactic medium Sherman, R. D. Abstract 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. Publication: The Astrophysical Journal Pub Date: June 1981 DOI: 10.1086/158933 Bibcode: 1981ApJ...246..365S Keywords: Cosmology; Galactic Evolution; Intergalactic Media; Quasars; Density (Number/Volume); Emission Spectra; Far Ultraviolet Radiation; Gas Ionization; Luminosity; Astrophysics full text sources ADS |
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