SIMBAD references

2004PASP..116..622P - Publ. Astron. Soc. Pac., 116, 622-633 (2004/July-0)

The Sloan Digital Sky Survey damped Lyα survey: data release 1.


Abstract (from CDS):

We present the results from an automated search for damped Lyα (DLA) systems in the quasar spectra of Data Release 1 from the Sloan Digital Sky Survey (SDSS-DR1). At z~2.5, this homogeneous data set has greater statistical significance than the previous two decades of research. We derive a statistical sample of 71 DLA systems (>50 previously unpublished) at z>2.1 and measure H I column densities directly from the SDSS spectra. The number of DLA systems per unit redshift is consistent with previous measurements, and we expect our survey has more than 95% completeness. We examine the cosmological baryonic mass density of neutral gas, Ωg, inferred from the DLA systems from the SDSS-DR1 survey and a combined sample drawn from the literature. Contrary to previous results, the Ωgvalues do not require a significant correction from Lyman limit systems at any redshift. We also find that the Ωgvalues for the SDSS-DR1 sample do not decline at high redshift, and the combined sample shows a (statistically insignificant) decrease only at z>4. Future data releases from SDSS will provide the definitive survey of DLA systems at z~2.5 and will significantly reduce the uncertainty in Ωgat higher redshift.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/PASP/116/622): table1.dat>

Nomenclature: Table 2: [PH2004] QSO JHHMM+DDMM abs N.NNN N=71.

Simbad objects: 75

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