338 citations · 749 across the 7 of their papers we have counts for
7 papers
Metal Absorption Systems in Spectra of Pairs of QSOs
David Tytler, Mark Gleed, Carl Melis +6
We present the first large sample of absorption systems in paired QSOs consisting of 691 absorption systems in the spectra of 310 QSOs including 170 pairings. All these absorption…
The UCSD HIRES/KECK I Damped Lya Abundance Database: IV. Probing Galactic Enrichment Histories with Nitrogen
Jason X. Prochaska, Richard B. C. Henry, John M. O'Meara +5
We present 14 N^0 measurements from our HIRES/Keck database of damped Lya abundances. These data are combined with measurements from the recent and past literature to build an homo…
The UCSD HIRES/KeckI Damped Lya Abundance Database III. An Empirical Study of Photoionization in the Damped Lya System Toward GB1759+7539
Jason X. Prochaska, J. Christopher Howk, John M. O'Meara +5
We investigate the ionization state of the damped Lya system at z=2.62 toward GB1759+7539 through an analysis of ionic ratios sensitive to photoionization: ArI/SII, FeIII/FeII, NII…
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…
The Deuterium to Hydrogen Abundance Ratio Towards a Fourth QSO: HS0105+1619
John M. O'Meara, David Tytler, David Kirkman +4
We report the measurement of the primordial D/H abundance ratio towards QSO \object. The column density of the hydrogen in the Lyman limit system is high, \lnhi $=…
Review of Big Bang Nucleosynthesis and Primordial Abundances
David Tytler, John M. O'Meara, Nao Suzuki +1
Big Bang Nucleosynthesis (BBN) is the synthesis of the light nuclei, Deuterium, He3, He4 and Li7, during the first few minutes of the universe. This review concentrates on recent i…
QSO 0130-4021: A third QSO showing a low Deuterium to Hydrogen Abundance Ratio
David Kirkman, David Tytler, Scott Burles +2
We have discovered a third quasar absorption system which is consistent with a low deuterium to hydrogen abundance ratio, D/H = 3.4 times 10^-5. The z ~ 2.8 partial Lyman limit sys…