Optical-infrared studies of the rich cluster of galaxies Abell 370 at Z = 0.37

Details Optical-infrared studies of the rich cluster of galaxies Abell 370 at Z = 0.37 Optical-infrared studies of the rich cluster of galaxies Abell 370 at Z = 0.37

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..128a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 1, 1991, p. 128-138. Research supported by Un

Astronomy and Astrophysics

Astronomy

33

Galactic Clusters, Infrared Astronomy, Visible Spectrum, Astronomical Spectroscopy, Charge Coupled Devices, Color-Magnitude Diagram, Infrared Telescopes, Red Shift

Scientific paper

Using the infrared camera IRCAM on the 3.8-m UK Infrared Telescope, new K photometry has been added to existing optical CCD measurements for a complete sample of 53 galaxies with K below 17.5 mag in the intermediate-redshift rich cluster Abell 370 (z = 0.37). Techniques for processing 2-micron images that achieve flatness to 0.04 percent and a 1-sigma surface-brightness detection limit of 21.5 mag/sq arcsec. The mean optical-infrared color-magnitude relation for early-type galaxies expected to be members on the basis of both spectroscopy and optical colors, is in excellent agreement with that deduced locally when redshift corrections are applied. In contrast to earlier results, no evidence for significant galactic reddening is found in this direction. However, a large proportion (60 percent) of red members appear to be about 0.1 mag redder in R-K than present-day ellipticals, and a high proportion of these have spectroscopic features indicative of the post-starburst phase. Following earlier suggestions, a model whereby a significant fraction of early-type members suffer short-term bursts of star formation is examined.

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