544 citations · 2.7k across the 53 of their papers we have counts for
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The Nitrogen and Oxygen abundances in the neutral gas at high redshift
Patrick Petitjean, Cedric Ledoux, R. Srianand
We study the Oxygen and Nitrogen abundances in the interstellar medium of high-redshift galaxies. We use high resolution and high signal-to-noise ratio spectra of Damped Lyman-alph…
Multiphase Plasma in Sub-Damped Lyman Alpha Systems: A Hidden Metal Reservoir
Andrew J Fox, Patrick Petitjean, Cédric Ledoux +1
We present a VLT/UVES spectrum of a proximate sub-damped Lyman-alpha (sub-DLA) system at z=2.65618 toward the quasar Q0331-4505 (z_qso=2.6785+/-0.0030). Absorption lines of O I, Si…
The host of GRB 060206: kinematics of a distant galaxy
Christina C. Thoene, Klaas Wiersema, Cedric Ledoux +13
We present early (starting 1.6h after the burst) WHT/ISIS optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 detecting a range of metal absorption lines and th…
Excitation mechanisms in newly discovered H2-bearing Damped Lyman-alpha clouds: systems with low molecular fractions
P. Noterdaeme, C. Ledoux, P. Petitjean +3
We probe the physical conditions in high-redshift damped Ly-alpha systems using the observed molecular fraction and the rotational excitation of molecular hydrogen. We report two n…
C IV absorption in damped and sub-damped Lyman-alpha systems: correlations with metallicity and implications for galactic winds at z~2-3
Andrew J. Fox, Cédric Ledoux, Patrick Petitjean +1
We present a study of C IV absorption in a sample of 63 damped Lyman-alpha (DLA) systems and 11 sub-DLAs in the redshift range 1.75<z_abs<3.61, using a dataset of high-resolution (…
Intervening Metal Systems in GRB and QSO sight-lines: The Mgii and Civ Question
Vladimir Sudilovsky, Sandra Savaglio, Paul Vreeswijk +3
Prochter et al. 2006 recently found that the number density of strong intervening 0.5<z<2 MgII absorbers detected in gamma-ray burst (GRB) afterglow spectra is nearly 4 times large…