5 papers
An HI Survey of LSB galaxies selected from the APM Survey
Stephanie Cote, Tom Broadhurst, Jon Loveday +1
We present preliminary results of a neutral hydrogen (HI) redshift survey to find low surface brightness (LSB) galaxies in the very nearby universe. Our sample consists of all gala…
Keck Spectroscopy of Giant Arcs in Abell 2390
B. L. Frye, T. J. Broadhurst, H. Spinrad +1
We present new Keck observations of giant arcs in the cluster Abell 2390. High resolution two-dimensional spectra of two arcs show metal lines at z=4.040 +/- 0.005 with Lyman-alpha…
BIMA and Keck Imaging of the Radio Ring PKS 1830-211
B. L. Frye, F. Courbin, T. Broadhurst +5
We discuss BIMA (Berkeley Illinois Maryland Association) data and present new high quality optical and near-IR Keck images of the bright radio ring PKS 1830-211. Applying a powerfu…
Gravitational `Convergence' and Cluster Masses
Tom Broadhurst
Two colour photometry of the cluster A1689 reveals a `relative magnification-bias' between lensed blue and red background galaxies, arising from a dependence of the faint galaxy co…
Recent Developments in Weak Lensing
Nick Kaiser, Gordon Squires, Greg Fahlman +2
Measurement of the gravitational distortion of images of distant galaxies is rapidly becoming established as a powerful probe of the dark mass distribution in clusters of galaxies.…