250 citations · 1.3k across the 24 of their papers we have counts for
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QSO Absorption Line Systems
Patrick Petitjean
It is difficult to describe in a few pages the numerous specific techniques used to study absorption lines seen in QSO spectra and to review even rapidly the field of research base…
Adaptive optics imaging and integral field spectroscopy of APM 08279+5255: Evidence for gravitational lensing
C. Ledoux, B. Theodore, P. Petitjean +5
We report observations of the z = 3.87 broad absorption line quasar APM 08279+5255 (Irwin et al. 1998) with the Adaptive Optics Bonnette (AOB) of the Canada-France-Hawaii Telescope…
Molecules in QSOs and QSO Absorption Line Systems at High Redshift
Patrick Petitjean
Molecules dominate the cooling function of neutral metal-poor gas at high density. Observation of molecules at high redshift is thus an important tool toward understanding the phys…
HST Observations of the QSO pair Q1026-0045A,B
Patrick Petitjean, Jean Surdej, Alain Smette +3
The spatial distribution of the Ly forest is studied using new HST data for the quasar pair Q~1026--0045 A and B at = 1.438 and 1.520 respectively. The angular separati…
A kinematical analysis of NGC 2992
I. Marquez, C. Boisson, F. Durret +1
We present long slit spectroscopy for the [OIII] and H wavelength ranges along nine different position angles for the Sa Seyfert 1.9 galaxy NGC 2992. Double profiles are present…
Are Damped Lyman alpha Systems Rotating Disks ?
Cedric Ledoux, Patrick Petitjean, Jacqueline Bergeron
We report on high spectral resolution observations of five damped Lyman alpha systems whose line velocity profiles and abundances are analyzed. By combining these data with informa…