Observations of clusters containing radio tail galaxies

Spectroscopic observations are reported for galaxies in A347, A779, and Zw 1809+50. These clusters contain at least six radio sources, two of which are well observed radio-tail sources. For A347, the mean cluster redshift implies physical association with A426, in accord with Zwicky's (1968) suggestion that both clusters are members of a single large group. The observed cluster velocity dispersion of A347 and the peculiar radial velocity of 3C66 suggest that this galaxy's radio source may be an intermediate angle tail rather than a projected narrow angle tail. The data for Zw 1809+50 and its radio-tail galaxy demonstrate that in situ particle acceleration plays a major role in determining the radio tail's length. Finally, the clusters' observed velocity dispersions and a velocity dispersion-X-ray luminosity relation are used to estimate X-ray fluxes from the clusters. These fluxes are in keeping with nondetection of the clusters by the Ariel V survey.