2001A&A...380..117E


Query : 2001A&A...380..117E

2001A&A...380..117E - Astronomy and Astrophysics, volume 380, 117-122 (2001/12-2)

Unusual metal abundances in a pair of damped Lyman alpha systems at z∼2.

ELLISON S.L. and LOPEZ S.

Abstract (from CDS):

We present high resolution spectroscopic observations of two neighbouring damped Lyman α systems (DLAs) along the same line of sight towards B2314-409. Due to their separation (v∼2000km/s) and the high spectral resolution of the data, it is possible to fit not only the weak metal transitions, but also the separate H I absorption profiles. This has permitted, for the first time, a detailed study of metal abundances in two neighbouring galaxy-scale absorbers. The two DLAs have zabs=1.8573 and 1.8745 and have column densities log N(H I)=20.9±0.1 and 20.1±0.2 respectively. We have determined abundances for a range of chemical elements, and find that both absorbers towards B2314-409 have low α/Fe-peak abundances compared with other known DLAs. This indicates that not only has the recent star formation history of these absorbers been relatively passive, but that the group environment, or some other external factor, may have influenced this.

Abstract Copyright:

Journal keyword(s): quasars: general - quasars: absorption lines - quasars: individual: B2314-409 - galaxies: evolution - galaxies: clusters: general

Nomenclature: Text, Table 1: [EL2001] DLA A (Nos A-B) = [EL2001] QSO J2316-4041 abs N.NNNN N=2, [EL2001] DLA A N (No. 1) = [EL2001] QSO J2316-4041 abs N.NNNNNN N=1, [EL2001] DLA B N (Nos 1-4) = [EL2001] QSO J2316-4041 abs N.NNNNNN N=4.

Errata: Erratum vol. 392, p. 489 (2002)

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 QSO B0201+113 QSO 02 03 46.65705710 +11 34 45.4094619   19.5 19.5 19.41   ~ 204 1
2 QSO J0407-4410 QSO 04 07 18.0880236912 -44 10 13.983623724   17.6 17.6     ~ 99 0
3 QSO J1039-2719 QSO 10 39 21.8517992640 -27 19 16.435341732     17.4     ~ 91 0
4 LBQS 2138-4427 QSO 21 41 59.5007724552 -44 13 25.930211268   19.17 18.20     ~ 67 1
5 LBQS 2139-4434 QSO 21 42 25.7845895976 -44 20 18.352777308   18.83 16.64     ~ 47 0
6 QSO B2314-409 QSO 23 16 46.91990359 -40 41 21.0863175   17.9 17.9     ~ 71 1

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