SIMBAD references

2000ApJ...543..552S - Astrophys. J., 543, 552-576 (2000/November-2)

Surveys for z>3 damped Lyα absorption systems: the evolution of neutral gas.


Abstract (from CDS):

We have completed spectroscopic observations using LRIS on the Keck 1 telescope of 30 very high redshift quasars, 11 selected for the presence of damped Lyα absorption systems and 19 with redshifts z>3.5 not previously surveyed for absorption systems. We have surveyed an additional 10 QSOs with the Lick 120" and the Anglo-Australian Telescope. We have combined these with previous data, resulting in a statistical sample of 646 QSOs and 85 damped Lyα absorbers with column densities N_HI_≥2x1020–2 covering the redshift range 0.008≤z≤4.694. Four main features of how the neutral gas in the universe evolves with redshift are evident from these data. To make the data in our statistical sample more readily available for comparison with scenarios from various cosmological models, we provide tables that include all 646 QSOs from our new survey and previously published surveys. They list the minimum and maximum redshift defining the redshift path along each line of sight, the QSO emission redshift, and when an absorber is detected, the absorption redshift and measured H I column density.

Abstract Copyright:

Journal keyword(s): Galaxies: Evolution - Galaxies: Intergalactic Medium - Galaxies: Quasars: Absorption Lines

VizieR on-line data: <Available at CDS (J/ApJ/543/552): tables 1-6, refs>

Nomenclature: Tables 2-5: [SW2000b] QSO JHHMM+DDMM abs N.NN, [SW2000b] QSO JHHMM+DDMM abs N.NNN, [SW2000b] QSO JHHMM+DDMM abs N.NNNN, N=116.

Errata: erratum vol. 592, p. 1263 (2003)

Simbad objects: 636

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