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CIV Absorbers in z>4 Quasars: Tracing Early Galactic Halos Evolution
Celine Peroux, Patrick Petitjean, Bastien Aracil +2
We use 29 z>4 quasar spectra to build a homogeneous sample of high-redshift CIV absorbers. We use these data to calculate the number density, n(z), of W_rest(CIV)>0.30 A CIV double…
Investigating lensing by absorbers in the 2dF-Quasar survey
Brice Ménard, Céline Péroux
We use the first data release of the 2-degree Field Quasar survey to investigate the effect of gravitational magnification by foreground absorbing systems on background quasars. We…
Nitrogen Abundances in High-z DLAs
P. Molaro, M. Centurion, V. D'Odorico +1
Determination of chemical abundances for elements produced mainly by Type I SNae and intermediate mass stars in high redshift DLAs probes the early chemical build-up on time-scales…
A Homogeneous Sample of Sub-DLAs II: Statistical, Kinematic and Chemical Properties
Celine Peroux, Miroslava Dessauges-Zavadsky, Sandro D'Odorico +2
Damped Ly-alpha Systems (DLAs), with N(HI)>2*10^20 cm^{-2}, observed in quasars have allowed us to quantify the chemical content of the Universe over cosmological scales. Such stud…
A Homogeneous Sample of Sub-DLAs I: Construction of the Sample and Chemical Abundance Measurements
M. Dessauges-Zavadsky, C. Peroux, T. -S. Kim +2
In this first paper of a series, we report on the use of quasar spectra obtained with the UVES high resolution spectrograph and available through the ESO VLT archive to build the f…
Ar I as a tracer of ionization evolution
Giovanni Vladilo, Miriam Centurion, Valentina D'Odorico +1
We present a study of Ar abundances in 15 damped Ly alpha systems (DLAs) in the redshift interval from 2.3 to 3.4. The sample includes 4 new UVES/VLT measurements of Ar I column de…