Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984acasn..25..241z&link_type=abstract
(Acta Astronomica Sinica, vol. 25, no. 3, 1984, p. 241-249) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 9, March 1
Astronomy and Astrophysics
Astrophysics
Astronomical Spectroscopy, Quasars, Red Shift, Correlation Coefficients, Emission Spectra, Line Spectra
Scientific paper
Selection effects on the frequency distribution of quasar redshifts are investigated statistically, with a focus on the correlation between the identification of emission lines and redshift. The distribution predicted by the frequency with which certain key emission lines are used to determine the redshift is compared with the actual redshift distribution of the 1491 quasars with emission lines listed in the catalog of Hewitt and Burbidge (1980). Linear-regression analysis shows that the two distributions have a correlation coefficient of 0.56, or 0.418 at the 1-percent significance level. The two distributions have similar peaks at z = 0.2-0.4,0.8-0.9, 1.4-1.5, and near 1.95 and similar values at z = 0.1 and 1.5-1.8. The need to take this very important selection effect into account before attempting to evaluate the intrinsic or cosmological nature redshift distribution is stressed.
Deng Zu-Gang
Zhou Yanhua
Zou Zhen-Long
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