Surveys for z > 3 Damped Lyα Absorption Systems: The Evolution of Neutral Gas

@article{StorrieLombardi2000SurveysFZ,
  title={Surveys for z > 3 Damped Ly$\alpha$ Absorption Systems: The Evolution of Neutral Gas},
  author={L. J. Storrie-Lombardi and Arthur M. Wolfe},
  journal={The Astrophysical Journal},
  year={2000},
  volume={543},
  pages={552 - 576}
}
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 ≥ 2… 

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References

SHOWING 1-10 OF 54 REFERENCES

APM z ≳ 4 survey: distribution and evolution of high column density H i absorbers

Eleven candidate damped Lyα absorption systems were identified in 27 spectra of the quasars from the APM z ≳ 4 survey covering the redshift range 2.8 ≤ z_(absorption) ≤ 4.4 (eight with z_(absorption)

Evolution of neutral gas at high redshift: implications for the epoch of galaxy formation

Although observationally rare, damped Lyα absorption systems dominate the mass density of neutral gas in the Universe. 11 high-redshift damped Lyα systems covering 2.8 ≤z ≤ 4.4 were discovered in 26

New High-Redshift Damped Lyman-Alpha Absorption Systems and the Redshift Evolution of Damped Absorbers

We have discovered two high-redshift (z abs =3.388 and 2.908) damped Lyα absorption systems and a third possible damped system (z abs =3.080) while obtaining spectra of optical counterparts from a

Evolution of Lyman-limit absorption systems over the redshift range 0.40 < Z < 4.69

We present the results of a study of 15 z > 4.2 QSOs that extend statistical studies of Lyman-limit absorption line systems [N(H I) ≥ 1.6 x 10^(17) cm^(- 2)] to the highest redshifts currently

APM z>4 QSO Survey: Spectra and Intervening Absorption Systems

The APM multicolor survey for bright z > 4 objects, covering 2500 deg^2 of sky to m(R)~19, resulted in the discovery of thirty-one quasars with z > 4. High signal-to-noise optical spectrophotometry

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

The results of a new survey for distant galaxies identified on the basis of the damped Lyα absorption lines they produce in the spectra of high-redshift background QSOs are presented. These results

Metal Abundances at z < 1.5: Fresh Clues to the Chemical Enrichment History of Damped Lyα Systems

We explore the redshift evolution of the metal content of damped Lyα systems (DLAs) with new observations of four absorbers at z<1.5; together with other recently published data, there is now a

QSO Lyman limit absorption

The redshift distribution of QSO absorption systems which are optically thick in the Lyman continuum matches that of a non-evolving population of absorbers in a standard Friedmann cosmological model

Redshift Evolution of Lyman Limit Absorption in the Spectra of a Large Sample of Quasars

Using a sample of 119 QSOs, containing objects we have selected having previously available high quality ground-based and IUE spectral observations, together with Hubble Space Telescope (HST)

Damped Lyman-Alpha Absorption by Disk Galaxies with Large Redshifts. IV. More Intermediate-Resolution Spectroscopy

New intermediate-resolution spectroscopy for six members of a sample of 68 moderate- to high-redshift QSOs is presented. Evidence is reported which indicates that seven strong absorption features in
...