Mathematics – Logic
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..785k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 785-800.
Mathematics
Logic
10
Absorption Spectra, Cosmology, Quasars, Red Shift, Astronomical Models, Histograms, Line Spectra, Size (Dimensions)
Scientific paper
The extent of cosmological information which can be obtained from the observational data on QSO absorption line redshifts is assessed, assuming that a significant fraction of the observed systems are in fact due to intervening matter. The data are used to study various selection effects likely to affect the distribution of absorption redshifts and to determine the probable number distribution of absorbers per redshift interval of 0.1, as a function of redshift. The distribution obtained is found to be statistically incompatible with the redshift distribution of galaxies with constant cross-section for any Friedman cosmology with zero cosmological constant and deceleration constant equal to or greater than zero. The distributions obtained by assuming that those systems with relative velocity greater than 0.02c, 0.02c but not 0.1c to 0.11c, and 0.06c, or those systems without O VI and N V lines, are produced by intervening galaxies, were analyzed and were found to provide acceptable fits with the predictions of Friedman models.
Khare-Joshi P.
Perry Jonathan
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