English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have combined new high resolution UVES-VLT observations of a sample offour damped Ly-alpha systems (DLAs) at redshifts between z_abs = 1.7-2.5 withthe existing HIRES-Keck spectra to undertake a comprehensive study of theirphysical conditions and their abundances of up to 15 elements. In this paper,we present abundance measurements for Mn, Ti and Mg which are among the firstpresented in the literature at these redshifts. We confirm the underabundanceof Mn with respect to Fe as observed in lower redshift DLAs and a trend withdecreasing metallicity very similar to the one observed in Galactic metal-poorstars. This agreement between the Mn/Fe ratios in DLAs and in Galactic starssuggests that the DLAs and the Milky Way share some similarities in their starformation histories. However, these similarities must be cautiously interpretedand investigated in light of all of the elements observed in the DLAs. We haveobtained a first measurement and a significant upper limit of the Ti abundanceat z_abs ~ 2 from the TiII lines at lambda_rest > 3000 A, and we discuss howthe relative abundance of this highly depleted element can be used to proveunambiguously any enhancement of the abundance of the alpha-elements relativeto Fe-peak elements. We present the abundances of Mg for two DLAs in additionto the single Mg measurement existing in the literature. Contrary to the trendexpected from differential depletion, the [Mg/Si,S] ratios tend to beover-solar. The effect is at the level of the measurement errors, but worthinvestigating in a larger sample because it could be suggestive of a peculiarnucleosynthesis effect.Comment: 8 pages, 6 figures, Accepted for publication in A&

New detections of Mn, Ti and Mg in damped Lyαsystems: Toward reconciling the dust/nucleosynthesis degeneracy