19 citations · 36 across the 4 of their papers we have counts for
4 papers
New HST spectra indicate the QSO PG1718+4807 will not give the primordial deuterium abundance
David Kirkman, David Tytler, John M. O'Meara +6
The z ~ 0.701 absorption system towards the QSO PG1718+4807 is the only example of a QSO absorption system which might have a deuterium/hydrogen ratio approximately ten times the v…
On the kinematics of damped Lyman-alpha systems
C. Ledoux, P. Petitjean, J. Bergeron +2
We report on high spectral resolution observations of five damped Ly-alpha absorbers. Line velocity profiles and heavy element abundances are discussed. Nitrogen is found to have a…
Do Quasars Lens Quasars?
E. J. Wampler
If the unexpectedly high frequency of quasar pairs with very different component redshifts is due to the lensing of a population of background quasars by the foreground quasar, typ…
High Resolution Observations of the QSO BR1202-0725: Deuterium and Ionic Abundances at Redshifts Above z=4
E. J. Wampler, G. M. Williger, J. A. Baldwin +3
We present results from 12 km/s resolution echelle spectroscopy of the bright QSO BR1202-0725. A preliminary analysis shows that high metallicity narrow line absorption c…