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A. R. Martel, J. A. Biretta, M. McMaster, W. B. Sparks, S. A. Baum (STScI), P. J. McCarthy (Carnegie Obs.)
We present narrow-band images of ~4 3CR radio galaxies obtained with HST's WFPC2 camera in the [O~II]\lambda3727,[O~III]\lambda5007, and H\alpha+[N~II] bands as part of the 3CR Snapshot Survey. A preliminary analysis of the images reveals a wide variety of emission-line morphologies, from compact nuclear regions to large-scale emission knots and filaments. We find a close correspondence between the emission-line and radio axes (offset < 40\circ) and a positive correlation between the radio luminosity and spatial extent of the emission-line regions. We detect resolved line emission in the centres of the giant nuclear dust disks of 3C~264 and 3C~449, and possibly in two others, 3C~31 and 3C~465. We do not detect line emission along the optical synchrotron jets of 3C~78 and 3C~264 although there is a hint of disk-like emission orthogonal to the jet of 3C~78. Among the QSO subsample, we positively identify resolved emission-line regions in the two QSOs 3C~249.1 and 3C~277.1, tentatively in 3C~263, 3C~454.3, and 3C~380, and none in 3C~93, 3C~175, and 3C~207.