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21 papers · 1 filter
The Serendipitous Discovery of a Group or Cluster of young Galaxies at z=2.40 in Deep Hubble Space Telescope WFPC2 Images
Sebastian M. Pascarelle, Rogier A. Windhorst, Simon P. Driver +2
We report the serendipitous discovery of a group or cluster of young galaxies at 2.40 in a 24-orbit HST/WFPC2 exposure of the field around the weak radio galaxy 53W002. Po…
Hubble Space Telescope Observations of the Lensing Cluster Abell 2218
J. -P. Kneib, R. S. Ellis, I. Smail +2
We present a striking new Hubble Space Telescope (HST) observation of the rich cluster Abell 2218 taken with the Wide-Field and Planetary Camera (WFPC2). HST's restored image quali…
Lensing by Distant Clusters: HST Observations of Weak Shear in the Field of 3C324
Ian Smail, Mark Dickinson
We present the detection of weak gravitational lensing in the field of the radio galaxy 3C324 (z=1.206) using deep HST imaging. ~From an analysis of the shapes of faint R=24.5-27.5…
Galaxy Harassment and the Evolution of Clusters of Galaxies
Ben Moore, Neal Katz, George Lake +2
Disturbed spiral galaxies with high rates of star formation pervaded clusters of galaxies just a few billion years ago, but nearby clusters exclude spirals in favor of ellipticals.…
The life-cycle of star formation in distant clusters
A. J. Barger, A. Aragon-Salamanca, R. S. Ellis +3
We analyse the detailed distribution of star-forming and post-starburst members in three distant (z = 0.31) galaxy clusters in terms of evolutionary sequences that incorporate seco…
The Great Circle Camera: A New Drift Scanning Instrument
Dennis Zaritsky, Stephen A. Shectman, Gregory Bredthauer
We discuss the design, construction, and use of a new class of scanning camera that eliminates a critical limitation of standard CCD drift-scan observations. A standard scan, which…