47 citations · 47 across the 1 of their papers we have counts for
4 papers · 1 filter
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…
Isolating the Foreground of the X-Ray Background
A. Refregier, D. J. Helfand, R. G. McMahon
The foreground component of the X-ray Background (XRB) can be studied by cross-correlating its intensity with galaxy catalogs. We computed the two-point cross-correlation function…
The Deficit of Distant Galaxy Clusters in the RIXOS X-ray Survey
F. J. Castander, R. G. Bower, R. S. Ellis +8
Clusters of galaxies are the largest gravitationally bound systems and therefore provide an important way of studying the formation and evolution of the large scale structure of th…
High Redshift Lyman Limit and Damped Lyman-Alpha Absorbers
L. J. Storrie-Lombardi, R. G. McMahon, M. J. Irwin +1
We have obtained high signal:to:noise optical spectroscopy at 5Å resolution of 27 quasars from the APM z4 quasar survey. The spectra have been analyzed to create new samples of…