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UVES observations of a damped Lyɑ system at z_(abs) = 4.466 towards the quasar APM BR J0307-4945

Dessauges-Zavadsky, M. and D'Odorico, S. and McMahon, R. G. and Molaro, P. and Ledoux, C. and Péroux, C. and Storrie-Lombardi, L. J. (2001) UVES observations of a damped Lyɑ system at z_(abs) = 4.466 towards the quasar APM BR J0307-4945. Astronomy and Astrophysics, 370 (2). pp. 426-435. ISSN 0004-6361.

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We present the first high-resolution (6.2 to 7.7 km s^(-1) FWHM) spectra of the APM BR J0307-4945 quasar at z_(em) = 4.73 obtained with UVES on the 8.2 m VLT Kueyen telescope. We focus our analysis on a damped Lyɑ (DLA) system at z_(abs) = 4.466 with a neutral hydrogen column density N(HI) = (4.68 ± 0.97) 10^(20) cm^(-2). It is the most distant DLA system known to the present date, observed when the age of the universe was only 1.3 Gyr. It shows complex low- and high-ionization line profiles spanning ≈240 and 300 km s^(-1) in velocity space respectively. We derive accurate abundances for N, O, Al, Si and Fe, and place a lower limit on C and an upper limit on Ni: [N/H] =-3.07 ± 0.15, [O/H] =-1.63 ± 0.19, [Al/H] =-1.79 ± 0.11, [Si/H] =-1.54 ± 0.11, [Fe/H] =-1.97 ± 0.19, [C/H] > -1.63 and [Ni/H] < -2.35. The derived high metallicity, ~1/90 solar, shows that this very young absorber (≤ 1.3 Gyr) has already experienced a significant metal enrichment. The [O/Si] ratio is nearly solar suggesting a limited amount of dust, the relative [Si, O/Fe] abundance ratios show a similar enhancement as observed in the Milky Way stars with comparable metallicities, and the [N/O] ratio is very low. All these results point to an enrichment pattern dominated by type II supernovae which suggests a Milky Way type evolutionary model.

Item Type:Article
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Storrie-Lombardi, L. J.0000-0002-5987-5210
Additional Information:© 2001 ESO. Received 14 September 2000, Accepted 2 February 2001. We are indebted to all people involved in the conception, construction and commissioning of UVES for the high quality of the spectra obtained early in the operation of the instrument. We warmly thank J. X. Prochaska and J. Bergeron for useful comments on an earlier version of the paper and P. Bristow for carefully checking the english text. M.D.-Z. is supported by an ESO Studentship and the Swiss National Funds.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Southern Observatory (ESO)UNSPECIFIED
Swiss National Fund (SNF)UNSPECIFIED
Subject Keywords:cosmology: observations - galaxies: abundances - galaxies: evolution - quasars: absorption lines
Issue or Number:2
Record Number:CaltechAUTHORS:20170328-122127579
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Official Citation:UVES observations of a damped Lyα system at z_(abs) = 4.466 towards the quasar APM BR J0307-4945 M. Dessauges-Zavadsky, S. D'Odorico, R. G. McMahon, P. Molaro, C. Ledoux, C. Péroux and L. J. Storrie-Lombardi A&A, 370 2 (2001) 426-435 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75479
Deposited By: Ruth Sustaita
Deposited On:28 Mar 2017 19:54
Last Modified:03 Oct 2019 16:50

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