EDP Sciences
Free access
Issue
A&A
Volume 366, Number 2, February I 2001
Page(s) 387 - 394
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20000108


A&A 366, 387-394 (2001)
DOI: 10.1051/0004-6361:20000108

Slit spectroscopy of nine new $\vec{z > 3}$ southern QSOs: Damped Ly$\alpha$ and Lyman-limit systems

S. Lopez1, J. Maza1, J. Masegosa2 and I. Marquez2

1  Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
2  Instituto de Astrofísica de Andalucía, C/Camino Bajo de Huetor 24, 18080 Granada, Spain

(Received 27 July 2000 / Accepted 14 November 2000)

Abstract
We present FWHM = 5 to 8 Å optical spectra of nine previously unknown quasars (QSOs) drawn from the Calan/Tololo Survey. We have chosen this sample based on QSO redshift, z> 3, and the presence of either candidate damped Ly$\alpha$ (DLA) or Lyman-limit (LL) systems in their spectra. The spectra show at least 9 DLA systems at redshifts 2.25< z< 3.26, which are identified by the shape and strength of the HI-Ly$\alpha$ absorption line, by the presence of Ly$\beta$ and low-ionization metal lines at the same redshift, and -in most cases -by the observed Lyman-break. We thus provide the astronomical community with new interesting targets for high resolution spectroscopy on large telescopes. We describe all the spectra with emphasis on the most outstanding DLA and LL systems found.


Key words: cosmology: observations -- quasars: individual: CTQ 247, CTQ 298, CTQ 314, CTQ 325, CTQ 408, CTQ 460, CTQ 476, CTQ 1005, CTQ 1061 -- quasars: general -- absorption lines

Offprint request: S. Lopez, slopez@das.uchile.cl

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