201 citations · 755 across the 7 of their papers we have counts for
6 papers
HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418
P. Noterdaeme, P. Petitjean, C. Ledoux +2
We present the detection of deuterated molecular hydrogen (HD) in the remote Universe in a damped Lyman-alpha cloud at zabs=2.418 toward the quasar SDSS J143912.04+111740.5. This i…
Detection of the 2175Å~ extinction feature and 21-cm absorption in two MgII systems at z~1.3
R. Srianand, N. Gupta, P. Petitjean +2
We have discovered two dusty intervening MgII absorption systems at z~1.3 in the Sloan Digital Sky Survey (SDSS) database. The overall spectra of both QSOs are red (u-K>4.5 mag) an…
Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
P. Noterdaeme, C. Ledoux, P. Petitjean +1
We present the current status of ongoing searches for molecular hydrogen in high-redshift (1.8 < zabs <= 4.2) Damped Lyman-alpha systems (DLAs) capitalising on observations perform…
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…
Physical conditions in the neutral interstellar medium at z=2.43 toward Q2348-011
P. Noterdaeme, P. Petitjean, R. Srianand +2
We obtained a high-resolution VLT-UVES spectrum of the quasar Q2348-011 over a wavelength range that covers most of the prominent metal and molecular absorption lines from the log…
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…