%0 Generic %1 berg2016chemical %A Berg, T. A. M. %A Ellison, S. L. %A Sanchez-Ramirez, R. %A Prochaska, J. X. %A Lopez, S. %A D'Odorico, V. %A Becker, G. %A Christensen, L. %A Cupani, G. %A Denney, K. %A Worsek, G. %D 2016 %K DLA abundance %T Chemical abundances of damped Lyman alpha systems in the XQ-100 survey %U http://arxiv.org/abs/1609.05968 %X 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.

@misc{berg2016chemical, 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.}, added-at = {2016-09-21T09:33:17.000+0200}, author = {Berg, T. A. M. and Ellison, S. L. and Sanchez-Ramirez, R. and Prochaska, J. X. and Lopez, S. and D'Odorico, V. and Becker, G. and Christensen, L. and Cupani, G. and Denney, K. and Worsek, G.}, biburl = {https://www.bibsonomy.org/bibtex/2fcf75cff6bd961873a194ce826d197f0/miki}, description = {[1609.05968] Chemical abundances of damped Lyman alpha systems in the XQ-100 survey}, interhash = {da79449ba3daadd42e761d2665019c34}, intrahash = {fcf75cff6bd961873a194ce826d197f0}, keywords = {DLA abundance}, note = {cite arxiv:1609.05968Comment: Accepted to MNRAS. 19 pages plus Appendix material (102 pages total)}, timestamp = {2016-09-21T09:33:17.000+0200}, title = {Chemical abundances of damped Lyman alpha systems in the XQ-100 survey}, url = {http://arxiv.org/abs/1609.05968}, year = 2016 }