Query : 2001A&A...370..426D

2001A&A...370..426D - Astronomy and Astrophysics, volume 370, 426-435 (2001/5-1)

UVES observations of a damped Lyα system at zabs = 4.466 towards the quasar APM BR J0307-4945.


Abstract (from CDS):

We present the first high-resolution (6.2 to 7.7km/s FWHM) spectra of the APM BR J0307-4945 quasar at zem=4.73 obtained with UVES on the 8.2m VLT Kueyen telescope. We focus our analysis on a damped Lyα (DLA) system at zabs=4.466 with a neutral hydrogen column density N(HI)=(4.68±0.97)x1020cm–2. It is the most distant DLA system known to the present date, observed when the age of the universe was only 1.3Gyr. It shows complex low- and high-ionization line profiles spanning ≃240 and 300km/s 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 (≤1.3Gyr) 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.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: abundances - galaxies: evolution - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/A+A/370/426): table5.dat>

Nomenclature: Tables 2, 3: [DDM2001] QSO J0307-4945 abs N.NNNNNN N=26. Table 5: [DDM2001] QSO J0307-4945 abs N.NNN N=14.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 QSO J0003-2603 QSO 00 03 22.9531962024 -26 03 18.304471908   18 17.53     ~ 286 0
2 QSO J0307-4945 QSO 03 07 22.8949808808 -49 45 48.274545240     18.76     ~ 60 0
3 QSO B0913+0715 QSO 09 16 13.9618240848 +07 02 24.497778588     17.1     ~ 103 0
4 QSO B0951-0450 QSO 09 53 55.7485789920 -05 04 18.968856168     19.0     ~ 57 0
5 LBQS 2206-1958A QSO 22 08 52.0729138920 -19 43 59.866776948   17.49 17.33     ~ 214 0

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