Multicolor, Two-Dimensional Photometric Study of Galaxies in Rich Abell Clusters. I. Observations and Reductions.

Details Multicolor, Two-Dimensional Photometric Study of Galaxies in Rich Abell Clusters. I. Observations and Reductions. Multicolor, Two-Dimensional Photometric Study of Galaxies in Rich Abell Clusters. I. Observations and Reductions.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1297h&link_type=abstract

The Astronomical Journal, v. 114, p. 1297.

Astronomy and Astrophysics

Astronomy

Galaxies: Photometry, Galaxies: Clusters: General

Scientific paper

We have embarked on a long term project to obtain high precision photometry on individual galaxies in 45 rich clusters of galaxies. Data from the first set of six clusters have yielded BVRI photometric information on 961 galaxies and 384 stars. These objects come from the central one Mpc of Abell 576, 957, 1185, 1377, 2063, and 2657, each of which is of richness class R≥1. Each object was examined with two radial surface brightness fitting functions, and an asymptotic magnitude was determined. One fitting function produced a shape parameter β which, when taken in combination with the color index (B - I), shows a breakdown of the three basic morphological types (E, SO, and S) into four β types and a set of peculiar galaxies. Our results match previous studies well, and also provide some new insights into the clusters. In addition, we have examined the effects of plate scale on the determination of these photometric parameters. All parameters were found to repeat across plate scale differences. We also examined the effects of co-adding frames in an attempt to understand the degradation or improvement of the photometric parameters with increasing signal-to-noise.

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