Metals and dust in intermediate-redshift damped Lyα galaxies

Pushpa Khare, Varsha P. Kulkarni, James T. Lauroesch, Donald G. York, Arlin P S Crotts, Osamu Nakamura

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Abstract

We report on spectroscopic observations with the Multiple Mirror Telescope for 11 damped Lyα absorbers (DLAs) or strong DLA candidates at 0.1 < z < 1.5, including several absorbers discovered in the Sloan Digital Sky Survey. In particular, we have measured absorption lines of Zn II, Cr II, Ni II, Fe II, Mn II, Ti II, Ca II, and Si II. These measurements have doubled the sample of Zn and Cr measurements at z < 1. The average relative abundance patterns in these objects are very similar to those found for high-redshift DLAs reported in the literature. Our observations suggest that the dust content, as determined by [Cr/Zn], does not show much change with redshift. We also examine the sample for correlation of [Cr/Zn] with estimates of the quasar reddening. Our data suggest that the global mean metallicity of DLAs, as measured by the gas-phase abundance of Zn, at best shows a weak evolution with redshift over the range 0.4 < z < 3.9.

Original languageEnglish
Pages (from-to)86-109
Number of pages24
JournalAstrophysical Journal
Volume616
Issue number1 I
DOIs
Publication statusPublished - 2004 Nov 20
Externally publishedYes

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Keywords

  • Cosmology: observations
  • Galaxies: abundances
  • Galaxies: evolution
  • Quasars: absorption lines

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Khare, P., Kulkarni, V. P., Lauroesch, J. T., York, D. G., Crotts, A. P. S., & Nakamura, O. (2004). Metals and dust in intermediate-redshift damped Lyα galaxies. Astrophysical Journal, 616(1 I), 86-109. https://doi.org/10.1086/424893