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Three intervening galaxy absorbers towards GRB060418: faint and dusty?
Sara L. Ellison, Paul Vreeswijk, Cedric Ledoux +8
We present an analysis of three strong, intervening Mg II absorption systems (z_abs = 0.603, 0.656, 1.107) towards the optical afterglow of gamma-ray burst (GRB) 060418. From high…
Metallicity as a criterion to select H2 bearing Damped Lyman-alpha systems
Patrick Petitjean, C. Ledoux, P. Noterdaeme +1
We characterize the importance of metallicity on the presence of molecular hydrogen in damped Lyman-alpha (DLA) systems. We construct a representative sample of 18 DLA/sub-DLA syst…
Velocity-Metallicity Correlation for high-z DLA Galaxies: Evidence for a Mass-Metallicity Relation?
C. Ledoux, P. Petitjean, J. P. U. Fynbo +2
We used our database of VLT-UVES quasar spectra to build up a sample of 70 Damped Lyman-alpha (DLA) or strong sub-DLA systems with total neutral hydrogen column densities of log N(…
Abundance analysis of 5 early-type stars in the young open cluster IC2391
Ch. Stuetz, S. Bagnulo, E. Jehin +4
It is unclear whether chemically peculiar stars of the upper main sequence represent a class completely distinct from normal A-type stars, or whether there exists a continuous tran…
An optical supernova associated with the X-ray flash XRF 060218
E. Pian, P. A. Mazzali, N. Masetti +42
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supe…
Molecular Hydrogen in a Damped Lyman-alpha System at z_abs=4.224
C. Ledoux, P. Petitjean, R. Srianand
We present the direct detection of molecular hydrogen at the highest redshift known today (z_abs=4.224) in a Damped Lyman-alpha (DLA) system toward the quasar PSS J1443+2724. This…
The most metal-poor damped Ly alpha system at z<3: constraints on early nucleosynthesis
P. Erni, P. Richter, C. Ledoux +1
To constrain the conditions for very early nucleosynthesis in the Universe we compare the chemical enrichment pattern of an extremely metal-poor damped Lyman alpha (DLA) absorber w…
Relative abundance pattern along the profile of high redshift Damped Lyman-alpha systems
E. Rodriguez, P. Petitjean, B. Aracil +2
We investigated abundance ratios along the profiles of six high-redshift Damped Lyman-alpha systems, three of them associated with H2 absorption, and derived optical depths in each…
Early-type stars observed in the ESO UVES Paranal Observatory Project: I -- Interstellar Na I UV, Ti II and Ca II K observations
I. Hunter, J. V. Smoker, F. P. Keenan +5
We present an analysis of interstellar Na I (lambda=3302.37Å, 3302.98Å), Ti II (lambda=3383.76Å) and Ca II K (lambda=3933.66Å) absorption features for 74 sightlines towards O- and…