A Study of Nine High-Redshift Clusters of Galaxies. III. [ITAL]Hubble[/ITAL] [ITAL]Space[/ITAL] [ITAL]T[/ITAL][ITAL]elescope[/ITAL] Morphology of Clusters 0023+0423 and 1604+4304

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Abstract

We present a detailed morphological analysis of the galaxy populations in the rst two clusters to be completed in an extensive observational study of nine high-redshift clusters of galaxies. These two clusters, Cl 0023]0423 and Cl 1604]4304, are at redshifts of z \ 0.84 and z \ 0.90, respectively. The morphological studies are based on high angular resolution imagery taken with Wide Field Planetary Camera 2 aboard the Hubble Space T elescope. These data are combined with deep, ground-based BV RI photometry and spectra taken with the Keck 10 m telescopes. The morphological classications presented in this paper consist of two parts. First, we provide a quantitative description of the structural properties of D600 galaxies per cluster eld using the Medium Deep Survey automated data reduction and object classication software. This analysis includes the galaxy position, photometry, and best-t bulge]disk model. Second, for the brightest subsample of D200 galaxies per cluster eld, we provide a more detailed morphological description through a visual classication based on the revised Hubble classication scheme.

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