Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..583s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 583-592.
Astronomy and Astrophysics
Astrophysics
29
Absorption Spectra, Disk Galaxies, Galactic Evolution, Lyman Alpha Radiation, Quasars, Red Shift, Line Spectra, Space Density, Spectrum Analysis
Scientific paper
We present here observations at 3 Å resolution which confirm damped Lyα profiles for a number of candidate galaxy disk absorption systems in a sample of high-redshift QSOs. A combination of strong, self-damped Lyα absorption plus blended narrow absorption features adequately fits the data for 18 systems in 15 objects. This is at least a factor of five in excess of the number of galaxy disks expected to be intercepted by lines of sight to this sample of QSOs. These results imply that approximately 20% of the sky is covered by gaseous disks to a column density, NH I > 2 × 1020 cm-2 in the redshift interval z 2-3. We suggest that gaseous disks form relatively early in galaxies and that they may be considerably larger at early epochs.
Bradley Steven E.
Cohen Ross D.
Smith Harding E.
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