Abstract
We present narrow-band images of sixty-four 3CR radio sources observed in lines of [OII] 3727 Å, [OIII] 5007 Å, and H α using the WFPC2 camera on-board HST. The images reveal a wide variety of emission lime morphologies, from compact nuclear regions to large-scale emission knots, filaments, and spiral-like structures. Many objects give evidence of ionization cones. In general we find a close correspondence between the emission-line and radio axes; most are aligned within 40 degrees. There is also evidence for a positive correlation between radio luminosity and the spatial extent of the emission-line region. Properties of interesting individual objects are discussed.
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