A strong dependence of the narrow CIV absorption line density on the quasar emission redshift

Details A strong dependence of the narrow CIV absorption line density on the quasar emission redshift A strong dependence of the narrow CIV absorption line density on the quasar emission redshift

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275l..21b&link_type=abstract

Astronomy and Astrophysics, Vol. 275, p. L21 (1993)

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

The motivation for our work was to search for indications of gravitational lensing in samples of narrow metal absorption line systems observed in quasar spectra. We here discuss statistical properties of highly displaced CIV systems, taken from the line lists of five surveys found in the literature. In the combined sample, the number of systems per unit redshift range is strongly dependent on the quasar emission redshift z_e_ most significant is a "break" at z_e_ ~ 2.8. The only plausible explanation is a strong selection effect varying with z_e_; for z_e_ >~ 2.8, most quasars are selected with respect to the detection of Ly α emission in objective prism surveys. The negative redshift evolution of the absorbers, being present for absorption redshifts zalpha_ >~ 1.8, is possibly nothing but a reflection of this selection effect. We conclude that our result makes the association hypothesis for at least a large fraction of the absorbers more probable. Due to the non-uniformity of the yet observed quasar samples, it is not possible to test as to whether an amplification bias by gravitational lensing contributes to the z_e_-dependence of the absorption line density.

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