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The morphology of distant cluster galaxies. 1: HST observations of CL 0939+4713
Dressler, Alan; Oemler, Augustus, Jr.; Butcher, Harvey R.; Gunn, James E.
AA(Observatoires of the Carnegie Institution, Pasadena, CA, US), AB(Observatoires of the Carnegie Institution, Pasadena, CA, US), AC(Netherlands Foundation for Research in Astronomy, Dwingeloo, The Netherlan), AD(Netherlands Foundation for Research in Astronomy, Dwingeloo, The Netherlan)
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 107-120 (ApJ Homepage)
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NASA/STI Keywords:
Galactic Clusters, Galactic Evolution, Galactic Structure, Interacting Galaxies, Spaceborne Astronomy, Astronomical Photometry, Astronomical Spectroscopy, Hubble Space Telescope, Morphology, Starburst Galaxies
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We have obtained Hubble Space Telescope (HST) WFC observations of CL 0930+4713, a very rich cluster at z = 0.41 which exhibits an excess population of blue galaxies typical of clusters at that redshift. The images are of sufficient quality, despite the HST spherical aberration problems, to permit assignment of Hubble types to galaxies brighter than r approximtely equal to 24.0. Their colors, luminosity functions and structure suggest that most of the galaxies are normal examples of their Hubble type. However, there is a significant number of objects which appear to be undergoing tidal interactions and/or mergers. These data suggest that the excess blue galaxies seen in distant clusters are predominantly normal late-types spirals but also that dynamical interactions between galaxies may be an important process in such clusters and may be responsible for those galaxies which exhibit spectroscopic signs of starbursts.

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