Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...91....1p&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 91, no. 1, Nov. 1991, p. 1-52.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Clusters, Infrared Photometry, Red Shift, Star Distribution, Spatial Distribution, Star Formation, Visible Spectrum, Visual Observation
Scientific paper
Optical and infrared photometry and spectra of galaxies in six medium-redshift clusters covering the redshift range 0.19-0.4 are presented. The array photometry is used to note the radial distribution of the cluster galaxies with optical and infrared colors. By bisecting the galaxy population into red and blue halves, the tendency of the bluer galaxies to define rims or shells around the cores of the more distant clusters is noted, and its implications for delayed star formation is discussed. The optical photometry is also used to confirm flux calibrations of the long slit and multiple object spectra which were taken for a sample of central elliptical galaxies in each cluster. The infrared photometry is employed to extend the broadband flux levels for these spectra.
Pickles Andrew J.
van der Kruit Pieter Corijnus
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