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21 papers · 2 filters
New Limits on the Possible Variation of Physical Constants
M. J. Drinkwater, J. K. Webb, J. D. Barrow +1
Recent detections of high-redshift absorption by both atomic hydrogen and molecular gas in the radio spectra of quasars have provided a powerful tool to measure possible temporal a…
A Search for Gamma-Ray Burst Optical Emission with the Automated Patrol Telescope
Bruce Grossan, Saul Perlmutter, Michael Ashley
The Automated Patrol Telescope (APT) is a wide-field (5 X 5 deg.s), modified Schmidt capable of covering large gamma-ray burst (GRB) localization regions to produce a high rate of…
The Gaseous Extent of Galaxies and the Origin of \lya Absorption Systems. III. Hubble Space Telescope Imaging of \lya-Absorbing Galaxies at z < 1
H. -W. Chen, K. M. Lanzetta, J. K. Webb +1
We present initial results of a program to obtain and analyze HST WFPC2 images of galaxies identified in an imaging and spectroscopic survey of faint galaxies in fields of HST spec…
Morphological studies of the galaxy populations in distant "Butcher-Oemler" clusters with HST. II. AC103, AC118 and AC114 at z=0.31
W. J. Couch, A. J. Barger, I. Smail +2
We present new results of a program to study the detailed morphologies of galaxies in intermediate redshift clusters and hence understand the physical origin of the enhanced star f…
Observations of ground-state OH in the Large Magellanic Cloud
K. J. Brooks, J. B. Whiteoak
We have carried out a series of observations of the 1665- and 1667-MHz transitions of the 2Pi_3/2, J=3/2 OH ground state towards six selected HII regions in the Large Magellanic Cl…
A High Deuterium Abundance at z=0.7; Evidence for Cosmic Inhomogeneity?
J. K. Webb, R. F. Carswell, K. M. Lanzetta +3
Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO 1718+4807 (selected because of apparently ideal characteristics for measuring D/H) yield a D/H significantly…