We present work in progress on an Hα emission-selected sample of galaxies in the rich z = 0.237 cluster A 3665 (AC 106; Couch and Newell 1984). The sample was derived by scanning the monochromatic field (δλ = 15A) of the Taurus Tunable Filter (TTF) in search of redshifted Hα. The TTF sample represents a strict volume-limited selection for Hα emission through 5300 km s−1 in the rest frame of the cluster, encompassing cluster redshift. From such a sample we can derive Hα line luminosities and infer star-formation rates. Our average star-formation rates for A 3665 show little or no excess to that of the field population at this redshift.

Distant Clusters of Galaxies

Citations

Tunable Filter-Selected Hα Emission in the Rich Cluster A 3665 (AC 106)

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