SIMBAD references

2001ApJ...552...99P - Astrophys. J., 552, 99-105 (2001/May-1)

Galactic chemical abundances at z>3. I. First results from the echellette spectrograph and imager.

PROCHASKA J.X., GAWISER E. and WOLFE A.M.

Abstract (from CDS):

We present the first results from an ongoing survey to discover and measure the metallicity of z>3 damped Lyα systems with the Echellette Spectrograph and Imager (ESI) on the Keck II telescope. Our motivation arises from a recent study on damped Lyα systems suggesting only mild evolution in the cosmic metallicity from z∼2 to 4. The Echellette Spectrograph and Imager, which provides two complementary spectroscopic modes, is the ideal instrument for a z>3 damped Lyα survey. We describe our observing strategy and report on the discovery and analysis of five new z>3 damped Lyα systems acquired in a single night of observing. These observations further support the principal conclusions of the previous study: (1) the cosmic metallicity in neutral gas inferred from the damped Lyα systems does not evolve significantly from z∼2 to 4; (2) the unweighted metallicity exhibits a statistically significant decrease with increasing redshift; and (3) not a single damped Lyα system has a metallicity below [Fe/H]=-3. We discuss the implications of these results and comment on recent theoretical studies that attempt to explain the observations.

Abstract Copyright:

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

Nomenclature: Tables 1, 2: [PGW2001] QSO JHHMM+DDMM abs N.NNN N=3+36.

CDS comments: Table 1: Format of PSS QSOs is PSS JHHMM+DDMM.

Simbad objects: 68

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