Chemical abundances of damped Lyman alpha systems in the XQ-100 survey

Abstract

The XQ-100 survey has provided high signal-noise spectra of 100 redshift 3-4.5 quasars with the X-Shooter spectrograph. The metal abundances for 13 elements in the 41 damped Lyman alpha systems (DLAs) identified in the XQ-100 sample are presented, and an investigation into abundances of a variety of DLA classes is conducted. The XQ-100 DLA sample contains five DLAs within 5000 km/s of their host quasar (proximate DLAs; PDLAs) as well as three sightlines which contain two DLAs within 10,000 km/s of each other along the same line-of-sight (multiple DLAs; MDLAs). Combined with previous observations in the literature, we demonstrate that PDLAs with logN(HI)<21.0 show lower [S/H] and [Fe/H] (relative to intervening systems with similar redshift and N(HI)), whilst higher [S/H] and [Si/H] are seen in PDLAs with logN(HI)>21.0. These abundance discrepancies are independent of their line-of-sight velocity separation from the host quasar, and the velocity width of the metal lines (v90). Contrary to previous studies, MDLAs show no difference in [alpha/Fe] relative to single DLAs matched in metallicity and redshift. In addition, we present follow-up UVES data of J0034+1639, a sightline containing three DLAs, including a metal-poor DLA with [Fe/H]=-2.82 (the third lowest [Fe/H] in DLAs identified to date) at z=4.25. Lastly we study the dust-corrected [Zn/Fe], emphasizing that near-IR coverage of X-Shooter provides unprecedented access to MgII, CaII and TiII lines (at redshifts 3-4) to provide additional evidence for subsolar [Zn/Fe] ratio in DLAs.

Accepted to MNRAS. 19 pages plus Appendix material (102 pages total)

References in corpus (17)

• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• 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
• Sulphur and zinc abundances in Galactic halo stars revisited
• High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey
• On the Nature of Velocity Fields in High z Galaxies
• The Ucsd/Keck Damped Lya Abundance Database: A Decade of High Resolution Spectroscopy
• Carbon-Enhanced Metal-Poor Stars: Relics from the Dark Ages
• The first carbon-enhanced metal-poor star found in the Sculptor dwarf spheroidal
• The SDSS-DR5 Survey for Proximate Damped Lya Systems
• The Nitrogen and Oxygen abundances in the neutral gas at high redshift
• The ESO UVES Advanced Data Products Quasar Sample - III. Evidence of Bimodality in the [N/alpha] Distribution
• The Chemical Evolution Of High Z Galaxies From The Relative Abundances Of N, Si, S, And Fe In Damped Lyman Alpha Systems
• The Sightline to Q2343-BX415: Clues to Galaxy Formation in a Quasar Environment
• The most metal-rich damped Lyman alpha systems at z>1.5 I: The Data
• The ESO UVES Advanced Data Products Quasar Sample - IV. On the deficiency of Argon in DLA systems
• A cold metal-poor cloud traced by a weak MgII absorption at z~0.45. First detection of SiI, CaI and FeI in a QSO absorber

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