WFPC 2 Imaging of Two Galaxy Clusters at Z=1.2

Details WFPC 2 Imaging of Two Galaxy Clusters at Z=1.2 WFPC 2 Imaging of Two Galaxy Clusters at Z=1.2

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5465d&link_type=abstract

HST Proposal ID #5465

Mathematics

Logic

Hst Proposal Id #5465 Galaxies &Amp, Clusters Clusters/Lenses

Scientific paper

Using deep optical and infrared images taken at the KPNO 4m, we have identified two rich galaxy clusters around 3CR radio galaxies at z=1.2 These are perhaps the most distant clusters yet observed. The clusters appear to have a large population of extremely red members, contrary to naive expectations from an extrapolation of the Butcher-Oemler effect to large redshift. Both clusters apparently include galaxies as red as present day (z=0) ellipticals redshifted out to z=1.2. We propose to obtain deep HST images with WFPC 2 in order to examine the morphological types of these very red galaxies, and to study the properties of cluster galaxies in general at very large cosmic lookback times. We hope to investigate: whether the red galaxies are in fact relatively "unevolved" ellipticals; how their structural parameters compare to elliptical galaxies today; whether S0 galaxies exist at z=1.2; the frequency of interactions and mergers in very high redshift clusters; and the morphologies of cluster galaxies bluer than the "red envelope" galaxies. By imaging the radio galaxies themselves with the PC camera, we will obtain extremely deep images of these giant, morphologically peculiar objects. Finally, we will look for evidence of gravitational lensing of faint, extremely distant background sources by these high redshift clusters.

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