Uncertainties and apparent trends in the evolution of quasars

Details Uncertainties and apparent trends in the evolution of quasars Uncertainties and apparent trends in the evolution of quasars

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..336c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 336-343. Research supported by MPI and CNR.

Astronomy and Astrophysics

Astronomy

13

Emission Spectra, Galactic Evolution, Quasars, Astronomical Photometry, Continuous Radiation, Luminosity, Red Shift, Spectral Line Width

Scientific paper

The biases and uncertainties introduced in statistical samples of QSOs by photometric variances from the emission lines and from the fluctuations of the sky background are considered. Error effects considered include spurious trends, random residuals, and enhanced statistical variances. Correcting for the present effects, the evidence for strong evolution of the QSO population is preserved, but the average timescale is somewhat lengthened.

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