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2003MNRAS.345..480P - Mon. Not. R. Astron. Soc., 345, 480-496 (2003/October-3)
A homogeneous sample of sub-damped Lyman α systems - II. Statistical, kinematic and chemical properties.
PEROUX C., DESSAUGES-ZAVADSKY M., D'ODORICO S., KIM T.-S. and McMAHON R.G.
Abstract (from CDS):
Then we analyse the chemical content of this sample in conjunction with a compilation of abundances from 72 DLAs taken from the literature. As previously reported, the individual metallicities traced by [Fe/H] of these systems evolve mildly with redshift. Moreover, we analyse the H i column-density-weighted mean abundance, which is believed to be an indicator of the metallicity of the Universe. Although the number statistics is limited in the current sample, the results suggest a slightly stronger evolution of this quantity in the sub-DLA range. The effect is predominant at z < 2 and most of the evolution observed lies in this redshift range. Observational arguments support the hypothesis that the evolution we probe in the sub-DLA range is not due to their lower dust content. Therefore, these systems might be associated with a different class of objects, which better trace the overall chemical evolution of the Universe. Finally, we present abundance ratios of [Si/Fe], [O/Fe], [C/Fe] and [Al/Fe] for sub-DLAs in conjunction with DLA measurements from the literature. The elemental ratios in sub-DLAs are comparable with those from DLAs. It is difficult to decipher whether the observed values are the effect of nucleosynthesis or are due to differential dust depletion. The metallicities are compared with two different sets of models of galaxy evolution in order to provide constraints on the morphology of quasar absorbers.
Abstract Copyright: 2003 RAS
Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: formation - galaxies: high-redshift - quasars: absorption lines - quasars: general
Simbad objects: 23
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