A Study of Nine High-Redshift Clusters of Galaxies. III. Hubble Space Telescope Morphology of Clusters 0023+0423 and 1604+4304

We present a detailed morphological analysis of the galaxy populations in the first 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....

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Veröffentlicht in:The Astronomical journal 1998-08, Vol.116 (2), p.584-622
Hauptverfasser: Lubin, Lori M, Postman, Marc, Oke, J. B, Ratnatunga, Kavan U, Gunn, James E, Hoessel, John G, Schneider, Donald P
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Sprache:eng
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Zusammenfassung:We present a detailed morphological analysis of the galaxy populations in the first 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 Telescope. These data are combined with deep ground-based BVRI photometry and spectra taken with the Keck 10-m telescopes. The morphological classifications presented in this paper consist of two parts. First, we provide a quantitative description of the structural properties of 600 galaxies per cluster field using the Medium Deep Survey automated data reduction and object classification software. This analysis includes the galaxy position, photometry, and best-fit bulge+disk model. Second, for the brightest subsample of 200 galaxies per cluster field, we provide a more detailed morphological description through a visual classification based on the revised Hubble classification scheme. Based on these classifications, we have examined the general relation between galaxy morphology and other photometric and spectral properties. We find that, as expected, the elliptical and S0 galaxies are redder, on average, than are the spiral and irregular galaxies. (Author)
ISSN:1538-3881
0004-6256
1538-3881
DOI:10.1086/300464