  Using the HST WFPC2 we perform deep I-band imaging of 9 radio-selected (limit
14 microJanskys at 8.5 GHz) faint galaxies from Roche, Lowenthal and Koo
(2002). Two are also observed in V. Six of the galaxies have known redshifs of
0.4<z<1.0. Radial intensity profiles indicate that 7 are disk galaxies and 2
are bulge-dominated. Four of the six with redshifts have a high optical surface
brightness compared to typical disk galaxies. Two of the 9 galaxies are in
close interacting pairs, another two are very asymmetric and three have large,
luminous rings resembling the collisional starburst rings in the Cartwheel
galaxy. In most of these galaxies the high radio luminosities are probably the
result of interaction-triggered starbursts. The mixture of observed
morphologies suggests that enhanced radio luminosities often persist for >0.2
Gyr, to a late stage of the interaction. One of these 9 galaxies may be an
exception in that it is a large red elliptical and its strong radio emission is
more likely to be from an obscured AGN.
