ISO far-infrared observations of rich galaxy clusters I. Abell 2670

As part of an investigation of far-infrared emission from rich galaxy clust ers the central part of Abell 2670 has been mapped with ISO at 60 mu m, 100 mu m, 135 mu m, and 200 mu m using the PHT-C camera. Point sources detecte d in the field have infrared fluxes comparable to normal spirals at the clu ster distance. Probable optical counterparts are cluster galaxies with vari ous characteristics such as blue colour, Ha emission, or double nuclei. One source is extended which could possibly be emission from intracluster dust in debris from spiral galaxies.