Quasar redshift distribution and selection effects

Details Quasar redshift distribution and selection effects Quasar redshift distribution and selection effects

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cha%26a...9...20z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 9, Issue 1, p. 20-26.

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

With the Hewitt-Burbidge catalogue of quasars as our sample, separately for 3 sets of respectively 7, 11, and 13 spectral lines as the ``key lines'' in the identification of quasar redshifts, we derive the redshift distribution arising from the identification of the lines. A comparison between the calculated and observed distributions shows that 1) the two are clearly correlated, with a correlation coefficient of 0.56. 2) Similar peaks are present in both in the z-intervals 0.2 - 0.4, 0.8 - 0.9, 1.4 - 1.5, and particularly around 1.95, as well similar valleys at 0.1 and 1.5 - 1.8. 3) Both rise or fall together at z = 0.2, 0.3, 0.4, 0.8, 1.9, 1.4, 1.5, 1.6 and 1.7. It thus appears that selection effects play an important role in the redshift distribution of the quasars.

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