Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-05-17
Astrophys.J. 469 (1996) 78
Astronomy and Astrophysics
Astrophysics
21 LaTeX pages with 5 encapsulated Postscript figures included, uses AASTeX (v. 4.0) available at ftp://ftp.aas.org/pubs/ , to
Scientific paper
10.1086/177760
We have compiled a new and extensive catalog of heavy-element QSO absorption line systems and analyzed the distribution of absorbers in bright and faint QSOs, to search for gravitational lensing of background QSOs by the matter associated with the absorbers. There is a highly significant excess of C {\sc iv} absorbers in bright QSOs in the redshift range $z=1.2-3.2$, and this excess increases strongly as a function of QSO absolute magnitude. No significant excess is found for Mg {\sc ii} absorbers in the redshift range $z=0.30-1.55$. We rule out several possible reasons for this effect and argue that the C {\sc iv} excess could be due to gravitational lensing. If so, then the lensing masses must be at $z \gtrsim 1.5$ and within several hundred comoving Mpc of the QSOs, where the C {\sc iv} absorbers are mainly found. The absence of an excess in the available Mg {\sc ii} sample would then arise because the Mg {\sc ii} data does not sample this region of space.
Quashnock Jean M.
Vanden Berk Daniel E.
Yanny Brian
York Donald G.
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