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Detection of a Lyman-alpha Emission-Line Companion to the z=4.69 QSO BR1202-0725
Esther M. Hu, Richard G. McMahon, Eiichi Egami
We report the detection of a nearby emission-line companion to the z=4.695 quasar BR1202-0725. Deep narrow-band exposures on this field from the UH 2.2 m show a Ly alpha flux of 1.…
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…
A Supernova at z = 0.458 and Implications for Measuring the Cosmological Deceleration
S. Perlmutter, C. R. Pennypacker, G. Goldhaber +20
We have begun a program to discover high-redshift supernovae ( 0.25--0.5), and study them with follow-up photometry and spectroscopy. We report here our first discovery,…
The Cambridge-Cambridge ROSAT Serendipity Survey - II. Classification of X-ray Luminous Galaxies
B. J. Boyle, R. G. McMahon, B. J. Wiles +1
We present the results of an intermediate-resolution (1.5Å) spectroscopic study of 17 X-ray luminous narrow emission-line galaxies previously identified in the Cambridge-Cambridge…