WF/PC Imaging of the Distant Cluster 0016+16

Details WF/PC Imaging of the Distant Cluster 0016+16 WF/PC Imaging of the Distant Cluster 0016+16

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3013w&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #30.13; Bulletin of the American Astronomical Society, Vol. 25, p.838

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Several previous studies of distant clusters have suggested that significant evolution of cluster galaxies, either photometric or spectroscopic, occurs over lookback times of only a few Gyr (e.g., Butcher & Oemler 1984, Dressler & Gunn 1992). One cluster has proven particularly interesting by appearing to be simultaneously old and young: Cl0016+16 at z=0.54 is photometrically unevolved, with galaxies similar in colors to present-day ellipticals (Koo 1981) despite a lookback time of half the age of universe. On the other hand, galaxy spectra indicate 0016+16 has a significant population of ``E+A'' galaxies, leading Dressler to state that ``the population of this extremely rich cluster...is the most unusual we have found.'' We have recently obtained 3 hours of WF/PC 785LP (I) band imaging in the core of Cl0016+16, making this the most distant bona fide cluster studied with HST. The images contain nearly 100 galaxies down to I~24, reaching M(*+3) (for h=0.5, q_0=0.05). This poster describes the preliminary results from these images, which will allow us to probe the size and surface brightness of early-type galaxies at moderate redshift, determine the morphology of the ``E+A'' population, and search for evidence of arclets produced by gravitationally-lensed background galaxies.

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