Spectroscopy of the Double Quasars Q1343+266AB: The Relationship between Galaxies and QSO C IV Absorption Lines

We present spectra of QSOs 1343+266A, B, covering Ly to C IV emission at 2 A resolution, and nd further evidence that this system is not gravitationally lensed. We see, however, a large number of Ly and some C IV absorption features common to both spectra. The frequency of C IV lines in common indicates that these absorbers have a radius close to the sightline separation, 39 h 1 kpc (q o = 0:5), implying a spatial number density of these absorbers the same as current day L > 0:3L galaxies. Furthermore, the velocity mismatch for C IV systems indicates absorber masses in the range 10 11 M < M < 10 12 M . These results con rm that typical galaxies cause QSO C IV-line absorption.