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- W2070297624 abstract "view Abstract Citations (38) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Influence of QSO Emission-Line Velocity Shifts on Estimates of the Intergalactic Background Intensity Espey, Brian R. Abstract Observations of the Inverse Effect indicate that the observed number of QSOs cannot provide sufficient radiation to reionize the intergalactic medium. We reanalyze the data set of one such study and show that bias in the measurement of QSO redshifts can account for at least a proportion of the discrepancy between the observed and predicted ionizing background when current QSO luminosity evolution models are used. The exact value of the shortfall depends on the assumed opacity due to intervening absorption systems, but for one optically thick model our reassessment indicates that the apparent discrepancy between the observed ionizing background strength and that predicted from QSO-only models is halved. This result places ionization models which solely involve QSO ionizing radiation within a factor of ~4 of supplying all the photons required by the observations and may be within a factor of 2 if the opacity of the universe has been overestimated in current models. When account is taken of the incompleteness of the QSO luminosity function at high redshift, it is quite possible that the bulk of the intergalactic ionizing radiation is provided by active galactic nuclei. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/186912 Bibcode: 1993ApJ...411L..59E Keywords: Emission Spectra; Intergalactic Media; Quasars; Red Shift; Velocity Distribution; Line Spectra; Photoionization; Astrophysics; COSMOLOGY: OBSERVATIONS; GALAXIES: QUASARS: ABSORPTION LINES; GALAXIES: QUASARS: EMISSION LINES; ULTRAVIOLET: GALAXIES full text sources ADS |" @default.
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- W2070297624 title "The influence of QSO emission-line velocity shifts on estimates of the intergalactic background intensity" @default.
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