2002A&A...390...13D


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET12:30:08

2002A&A...390...13D - Astronomy and Astrophysics, volume 390, 13-25 (2002/7-4)

High matter density peaks from UVES observations of QSO pairs: Correlation properties and chemical abundances.

D'ODORICO V., PETITJEAN P. and CRISTIANI S.

Abstract (from CDS):

We study the transverse clustering properties of high matter density peaks as traced by high column density absorption systems (either Lyman limit systems characterized by N(HI)≥2x1017cm–2 or CIV systems with Wr>0.5Å) at redshifts between 2 and 3 with UVES spectra of two QSO pairs (UM680/UM681 at 56 arcsec angular separation and Q2344+1228/Q2343+1232 at 5 arcmin angular separation) and a QSO triplet (Q2139-4433/Q2139-4434/Q2138-4427 at 1, 7 and 8 arcmin angular separation). We find 3 damped Lyman-α systems (N(HI)≥2x1020cm–2): 2 coinciding with strong metal systems in the nearby line of sight and 1 matching the emission redshift of the paired QSO; plus 7 Lyman limit systems: 4 forming two matching couples and 3 without a corresponding metal system within ∼3000km/s in the coupled line of sight. In summary, we detect five out of ten matching systems within 1000km/s, indicating a highly significant overdensity of strong absorption systems over separation lengths from ∼1 to 8h–1Mpc. The observed coincidences could arise in gas due to starburst-driven superwinds associated with a quasar or a galaxy, or gas belonging to large scale structures like filaments or sheets. We also determine chemical abundance ratios for three damped Lyman-α systems. In particular, for the damped system at z∼2.53788 in the spectrum of Q2344+1228, new estimates of the ratios O/Fe, C/Fe are obtained: -0.02<[C/Fe]<0.06, -0.06<[O/Fe]<0.2. They indicate that O and C are not over-solar in this system.

Abstract Copyright:

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

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0307-195A QSO 03 10 06.1183340420 -19 21 24.227861593     18.6     ~ 47 0
2 QSO B0307-195B QSO 03 10 09.0835033007 -19 22 07.499047486   19.1 19.1     ~ 41 0
3 LBQS 2138-4427 QSO 21 41 59.5010115549 -44 13 25.925906956   19.17 18.20     ~ 61 1
4 QSO B2139-4433 QSO 21 42 22.1692806884 -44 19 29.743549966   21.21 20.18     ~ 17 0
5 LBQS 2139-4434 QSO 21 42 25.7847067944 -44 20 18.353629202   18.83 16.64     ~ 43 0
6 QSO B2343+125 QSO 23 46 28.200 +12 49 00.00     17.5     ~ 122 2
7 QSO B2344+125 QSO 23 46 32.80 +12 45 40.0     17.0     ~ 81 1

    Equat.    Gal    SGal    Ecl

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2020.12.03-12:30:08

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