Mathematics – Probability
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985chjss...5....1l&link_type=abstract
Chinese Journal of Space Sciences, vol. 5, Jan. 1985, p. 1-10. In Chinese, with abstract in English.
Mathematics
Probability
Cosmology, Probability Density Functions, Quasars, Space Density, Statistical Analysis, Evolution (Development), Iteration, Luminosity, Probability Distribution Functions, Red Shift, Regression Analysis, Samples, X Ray Sources
Scientific paper
The density distribution of quasars in the samples 3CR and 4C is investigated analytically, applying a modified V/Vmax method with an incompleteness factor which is obtained statistically from the deviation of individual quasars from the overall L-z curve. The results are presented in tables, graphs, and histograms and discussed. The density distribution is found to be correlated to q0 at the 90-percent confidence level, with a nearly homogeneous distribution for q0 = 0, a slight decrease in number of quasars as redshift increases for q0 = 0.5, and strong evidence for cosmological evolution at q0 = 1. The density-law exponent gamma is calculated for the q0 = 1 case and found to vary from 2 to 6, in good agreement with theoretical models of quasar morphology and evolution based on a low-density intergalactic medium.
Liu Zhan-Wei
Zhang Qing-Hong
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