Chemical diversity of gas in distant galaxies: The metal and dust enrichment and variations within absorbing galaxies

Abstract

The chemical composition of gas in galaxies can be measured in detail from absorption spectroscopy. By studying gas in galaxies in this way, it is possible to investigate the small and faint galaxies, which are the most numerous in the universe. In particular, the chemical distribution of gas in absorbing systems gives us insight into cycles of gas in and around galaxies. Here we study chemical enrichment within 64 Damped Lyman-alpha Absorption (DLA) systems between $1.7<z<4.2$. We use high-resolution spectra from VLT/UVES to infer dust depletion from relative abundances of several metals. We perform a component-by-component analysis within DLAs, and characterise variations in their chemical enrichment. Unlike hydrogen, the metal columns can be characterised for individual components. We use them to derive the dust depletion ([Zn/Fe]fit), as an indicator for chemical enrichment. We find that some DLAs are chemically diverse within themselves, with [Zn/Fe]fit ranging up to 0.62 dex within a single system. This suggests that absorbing gas within these galaxies is chemically diverse. Although we do not find a clear trend of decreasing dust depletion with redshift, we do see that the most chemically enriched systems are at lower redshifts. We also observe evidence for dust-poor components at all redshifts, which may be due to the accretion of pristine gas onto galaxies. We combine the chemical and kinematic properties of the individual gas components and observe potential signatures of infalling gas, with low depletion at velocities below $\sim$100km/s, and outflows, with high depletion and velocities of $\sim$600km/s. We find over-abundances of alpha-elements (an enhancement of $\sim$0.3dex) and under-abundances of Mn in several components, which is likely a signature of core-collapse SNe nucleosythesis in the ISM. We observe these effects mostly at lower levels of chemical enrichment.

56 pages, 99 figures, Accepted for publication in A&A, Abstract abridged for arXiv

References in corpus (28)

• The Circumgalactic Medium
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• The chemical make-up of the Sun: A 2020 vision
• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• The Cosmic Baryon and Metal Cycles
• The galaxy stellar mass function at 3.5<z<7.5 in the CANDELS/UDS, GOODS-South, and HUDF fields
• Velocity-Metallicity Correlation for high-z DLA Galaxies: Evidence for a Mass-Metallicity Relation?
• Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
• Mapping metallicity variations across nearby galaxy disks
• Predictions for the Angular Dependence of Gas Mass Flow Rate and Metallicity in the Circumgalactic Medium
• The Galactic radial abundance gradients of C, N, O, Ne, S, Cl and Ar from deep spectra of H II regions
• The NIRVANDELS Survey: a robust detection of $\alpha$-enhancement in star-forming galaxies at $z\simeq 3.4$
• Discovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048
• On the stellar masses of giant clumps in distant star-forming galaxies
• The Dynamics, Destruction, and Survival of Supernova-Formed Dust Grains
• The origin of dust in galaxies across cosmic time
• Large Metallicity Variations in the Galactic Interstellar Medium
• The Alpha-element knee of the Sagittarius Stream
• Zinc in the Sculptor dwarf spheroidal galaxy
• METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble program. II. Variations of interstellar depletions and dust-to-gas ratio within the LMC
• The mass-metallicity relation at cosmic noon in overdense environments: first results from the MAMMOTH-Grism HST slitless spectroscopic survey
• Dust depletion of metals from local to distant galaxies I: Peculiar nucleosynthesis effects and grain growth in the ISM
• MusE GAs FLOw and Wind (MEGAFLOW) V. The dust/metallicity-anisotropy of the Circum-Galactic Medium
• Relative abundance pattern along the profile of high redshift Damped Lyman-alpha systems
• HD 62542: Probing the Bare, Dense Core of a Translucent Interstellar Cloud
• Nature of the DLA towards Q0528-250: High pressure and strong UV field revealed by excitation of CI, H2 and SiII
• Multiple origins for the DLA at $z_{\mathrm{abs}}=0.313$ toward PKS 1127$-$145 indicated by a complex dust depletion pattern of Ca, Ti, and Mn
• Remarkably high mass and high velocity dispersion of molecular gas associated with a regular, absorption-selected type-I quasar

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