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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We analyse a sample of 24 damped Lyman-alpha (DLA)/moderate DLA systems at0.3<z<2.2, all with measurement of the weak MnII absorption lines, toinvestigate which elemental ratios could possibly be used as tracers of eitherdust depletion or nucleosynthesis effects. We applied a component-by-componentanalysis and show that the standard method which uses column densitiesintegrated over the whole absorption profiles could substantially underestimatethe abundance of rare elements relative to Fe. The apparent correlation wefound between [Mn/Fe] and [Zn/Fe] cannot be accounted for by any dust depletionsequence: it implies either variations of the intrinsic Mn abundance relativeto Fe from -0.3 to +0.1 dex and/or a relation between depletion level andmetallicity. The correlation between [Mn/Fe] and metallicity strengthens theassumption of intrinsic variations of [Mn/Fe] although some marginalcorrelation between [Zn or Si/Fe] and [Zn/H] is present as well. The variationsof [Ti/Fe] vs. [Zn/Fe] cannot be fitted by a single dust depletion sequenceeither. At high metallicity, [Fe/H]dc>~-0.5, the intrinsic (dust-corrected)abundance pattern of Si, Ti, Cr and Mn in DLA absorbers closely follows thetrends observed in Galactic stars and these absorbers should thus have achemical evolution similar to that of our Galaxy. At lower metallicity, someabsorbers do follow the trends present in Galactic stars but a substantialfraction of them have elemental ratios (in particular [Si/Fe]dc and [Mn/Fe]dc)closer to the solar values than Galactic stars. This could be explained by alarger contribution of type Ia supernovae to the chemical enrichment of theseDLA absorbers than in Galactic stars of similar metallicity. This metal-poorDLA absorber population could trace HI-rich dwarf galaxies. (Abridged)Comment: 17 pages, 5 figures, accepted for publication in A&

Dust depletion and abundance pattern in damped Lyα systems: A sample of Mn and Ti abundances at $z\, < $ 2.2