DAMPED LYα SYSTEMS

Wolfe, Arthur M.; Gawiser, Eric; Prochaska, J. X.

doi:10.1146/annurev.astro.42.053102.133950

Cited by 762 publications

(891 citation statements)

References 208 publications

(176 reference statements)

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“…Broadly speaking, this result is in line with the fact that DLA systems are metal poor. However, the mean value [Ar/H] is lower than the mean metallicity of DLA systems, [M/H] ≃ −1.1 dex (Wolfe et al 2005), indicating that argon is underabundant with respect to other metals. To evidentiate this underabundance, we use relative abundances, i.e., the abundances of argon relative to other products of stellar nucleosynthesis.…”

Section: Argon Deficiency In Dla Systemsmentioning

confidence: 95%

The ESO UVES Advanced Data Products Quasar Sample – IV. On the deficiency of argon in DLA systems

Zafar¹,

Vladilo²,

Péroux³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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In this work, we study argon abundances in the interstellar medium of high-redshift galaxies (2.0 z abs 4.2) detected as Damped Lyα absorbers (DLA) in the spectra of background quasars. We use high-resolution quasar spectra obtained from the ESO-UVES advanced data products (EUADP) database. We present 3 new measurements and 5 upper limits of Ar i. We further compiled DLAs/sub-DLA data from the literature with measurements available of argon and α-capture elements (S or Si), making up a total of 37 systems, i.e. the largest DLA argon sample investigated so far. We confirm that argon is generally deficient in DLAs, with a mean value [Ar/α] ≃ −0.4 ± 0.06 dex (standard error of the mean). The [Ar/α] ratios show a weak, positive trend with increasing H i column density and increasing absorption redshift, and a weak, negative trend with dust-free metallicity, [S/H]. Detailed analysis of the abundance ratios indicates that Ar i ionisation, rather than dust depletion or nucleosynthetic evolution, is responsible for the argon deficiency. Altogether, the observational evidence is consistent with a scenario of argon ionisation dominated by quasar metagalactic radiation modulated by local H i self-shielding inside the DLA host galaxies. Our measurements and limits of argon abundances suggest that the cosmic reionisation of He ii is completed above z ∼ 3, but more measurements at z abs > 3.5 are required to probe the final stages of this process of cosmic reionisation.

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Section: Argon Deficiency In Dla Systemsmentioning

confidence: 95%

The ESO UVES Advanced Data Products Quasar Sample – IV. On the deficiency of argon in DLA systems

Zafar¹,

Vladilo²,

Péroux³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…These inflows and outflows controlling galaxy evolution show up as intervening absorption systems along the lines-of-sight to background sources, typically QSOs. They include DLAs around galaxies (N HI > 10 20 cm −2 ) as well as LLS (N HI > 10 17 cm −2 ) and the rest of the Lyα forest (N HI < 10 17 cm −2 ) (e.g., Wolfe et al 2005;Rafelski et al 2011;Kim et al 2013). Numerical simulations predict Lyα column densities spanning the range from the Lyα forest to DLAs, inflow velocities ∼ 100 km s −1 , and metallicities between 10 −2.5 and 10 −1 Z (Sect.…”

Section: The Role Of Mergersmentioning

confidence: 99%

Star formation sustained by gas accretion

Alméida

Elmegreen

Muñoz–Tuñón

et al. 2014

Astron Astrophys Rev

183

130

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Numerical simulations predict that metal-poor gas accretion from the cosmic web fuels the formation of disk galaxies. This paper discusses how cosmic gas accretion controls star formation, and summarizes the physical properties expected for the cosmic gas accreted by galaxies. The paper also collects observational evidence for gas accretion sustaining star formation. It reviews evidence inferred from neutral and ionized hydrogen, as well as from stars. A number of properties characterizing large samples of star-forming galaxies can be explained by metal-poor gas accretion, in particular, the relationship among stellar mass, metallicity, and star-formation rate (the so-called fundamental metallicity relationship). They are put forward and analyzed. Theory predicts gas accretion to be particularly important at high redshift, so indications based on distant objects are reviewed, including the global star-formation history of the universe, and the gas around galaxies as inferred from absorption features in the spectra of background sources.

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“…The H I column densities of DLAs are so high that they, contrary to other classes of QSO absorbers, are mostly neutral. DLAs are thought to be the dominant reservoirs of neutral gas in the Universe in the interval z = 0-5; and this neutral gas is where a significant fraction of the stellar mass in present-day galaxies finds its origin (Storrie-Lombardi & Wolfe 2000;Wolfe et al 2005). Thanks to the Sloan Digital Sky Survey (SDSS), over 10 000 z > 2 DLAs are identified in the spectra of QSOs (Prochaska, Herbert-Fort & Wolfe 2005;Noterdaeme et al 2009Noterdaeme et al , 2012bProchaska & Wolfe 2009).…”

Section: Based On Observations Obtained With Eso Telescopes At the Pamentioning

confidence: 99%

“…Wolfe, Gawiser & Prochaska 2005, for a review). Furthermore, in gamma-ray burst (GRB) afterglow spectra, the host galaxy is often seen as a DLA.…”

Section: Introductionmentioning

confidence: 99%

Galaxy counterparts of metal-rich damped Lyα absorbers: the case of J205922.4−052842★

Hartoog

Fynbo

Kaper

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ABSTRACTWe present observations of three new sources in the European Southern Observatory VLT/Xshooter survey dedicated to the detection of the emitting counterparts of damped Lyα (DLA) systems towards bright quasars (QSOs). The aim is to bridge the observational gap between absorption (i.e. DLAs) and emission-selected galaxies at z ∼ 2.2-2.5, in order to get a more complete picture of (proto)galaxies around this epoch. The hypothesis is that because DLA galaxies fulfil metallicity-velocity width and luminosity-metallicity relations, highmetallicity DLAs are more likely to be detected in emission. The region around each QSO is covered with slits (1. We conclude that focusing on metal-rich DLAs is a good way to find counterparts, but the non-detections at high metallicity (e.g. that of the DLA in J105744.5+062914) show that there is not a one-to-one relationship, and cautions us to not naively apply the properties of the DLA counterparts to all metal-rich DLAs.

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DAMPED LYα SYSTEMS

Cited by 762 publications

References 208 publications

The ESO UVES Advanced Data Products Quasar Sample – IV. On the deficiency of argon in DLA systems

The ESO UVES Advanced Data Products Quasar Sample – IV. On the deficiency of argon in DLA systems

Star formation sustained by gas accretion

Galaxy counterparts of metal-rich damped Lyα absorbers: the case of J205922.4−052842★

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