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http://hdl.handle.net/20.500.12386/24980
Titolo: | Chemical abundances of the damped Lyman α systems in the XQ-100 survey | Autori: | Berg, T. A. M. Ellison, S. L. Sánchez-Ramírez, R. Prochaska, J. X. Lopez, S. D'ODORICO, Valentina Becker, G. Christensen, L. CUPANI, Guido Denney, K. Worseck, G. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 463 | Fascicolo: | 3 | Da pagina:: | 3021 | 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 Ly α 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<SUP>-1</SUP> of their host quasar (proximate DLAs; PDLAs) as well as three sightlines which contain two DLAs within 10 000 km s<SUP>-1</SUP> of each other along the same line of sight (multiple DLAs; MDLAs). Combined with previous observations in the literature, we demonstrate that PDLAs with log N(H I) < 21.0 show lower [S/H] and [Fe/H] [relative to intervening systems with similar redshift and N(H I)], whilst higher [S/H] and [Si/H] are seen in PDLAs with log N(H I) > 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 (v<SUB>90</SUB>). Contrary to previous studies, MDLAs show no difference in [α/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<SUB>abs</SUB> = 4.25. Lastly we study the dust-corrected [Zn/Fe], emphasizing that near-IR coverage of X-Shooter provides unprecedented access to Mg II, Ca II and Ti II lines (at redshifts 3-4) to provide additional evidence for subsolar [Zn/Fe] ratio in DLAs. | URI: | http://hdl.handle.net/20.500.12386/24980 | URL: | https://academic.oup.com/mnras/article/463/3/3021/2646633 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2232 | Bibcode ADS: | 2016MNRAS.463.3021B | Fulltext: | open |
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