A new spectroscopic survey for damped Ly-alpha absorption lines from high-redshift galaxies

Details A new spectroscopic survey for damped Ly-alpha absorption lines from high-redshift galaxies A new spectroscopic survey for damped Ly-alpha absorption lines from high-redshift galaxies

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...77....1l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 77, Sept. 1991, p. 1-57.

Astronomy and Astrophysics

Astronomy

242

Astronomical Spectroscopy, Galaxies, Lyman Alpha Radiation, Red Shift, Absorption Spectra, Line Spectra, Sky Surveys (Astronomy)

Scientific paper

New low-resolution (FWHM is approximately equal to 4-6 A) spectroscopy of a sample of 57 background QSOs is presented. These data are combined with similar low-resolution spectroscopy of 53 recently acquired background QSOs. The spectra are analyzed to generate a complete sample of absorption features which, if the features are assumed to be Ly-alpha lines, have restframe equivalent widths not less than 5 A. The mean number densities of the damped Ly-alpha absorbers are determined. The distribution of the number of damped Ly-alpha absorbers observed per background QSO spectrum is found to be consistent with what is expected for randomly distributed intervening objects. The number of lines of sight that exhibit two damped Ly-alpha lines is consistent with what is expected on Poisson statistics. No significant evidence for clustering of the damped Ly-alpha absorbers on velocity scales greater than 5000 km/s is found.

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