HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Early metal enrichment of gas-rich galaxies at z ∼ 5

Abstract : We present abundance measurements of elements O, C, Si and Fe for three gas-rich galaxies at z ∼ 5 using observations from the Very Large Telescope (VLT) and the Keck telescope in order to better constrain the early chemical enrichment of gas-rich galaxies. These galaxies show strong Lyman α absorption in the spectra of background quasars, with neutral hydrogen column densities log N_{H I} (cm-2) = 20.10 ± 0.15, 20.10 ± 0.15 and 20.80 ± 0.15. Using the undepleted element O, we find the metallicities [O/H] to be in the range of -2.51 to -2.05 dex. Our study has doubled the existing sample of measurements of undepleted elements at z > 4.5. Combining our measurements with those from the literature, we find that the N_{H I}-weighted mean metallicity of z ∼ 5 absorbers is consistent with the prediction based on z < 4.5 damped Lyman α absorbers. Thus, we find no significant evidence of a sudden drop in metallicity at z > 4.7 as reported by some prior studies. We also determine the extent of dust depletion using a combination of both the volatile element O and the refractory elements Si and/or Fe. Some of the absorbers show evidence of depletion of elements on dust grains, e.g. low [Si/O] or [Fe/O]. The relative abundances of these absorbers along with other z ∼ 5 absorbers from the literature show some peculiarities, e.g. low [C/O] in several absorbers and high [Si/O] in one absorber. Finally, we find that the metallicity versus velocity dispersion relation of z ∼ 5 absorbers may be different from that of lower redshift absorbers.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03666283
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Thursday, May 12, 2022 - 2:10:39 PM
Last modification on : Saturday, May 14, 2022 - 3:03:54 AM

File

stx2607.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Suraj Poudel, Varsha P. Kulkarni, Sean Morrison, Céline Péroux, Debopam Som, et al.. Early metal enrichment of gas-rich galaxies at z ∼ 5. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2018, 473, pp.3559-3572. ⟨10.1093/mnras/stx2607⟩. ⟨insu-03666283⟩

Share

Metrics

Record views

0

Files downloads

0