An HST emission-line imaging survey of 3CR radio galaxies
Sparks, W. B.; Macchetto, F.; McCarthy, P. J.; Baum, S. A.; Biretta, J. A.; Martel, A. R.; McMaster, M.
United States
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.