3C 317 : an amorphous radio source in the cooling flow cluster Abell 2052

We have observed the radio source 3C 317 in the X-ray cooling flow cluster A2052 using the VLA at wavelengths 90, 20, 6, and 3.6 cm. Unlike most moderate-power extragalactic radio sources, 3C 317 is characterized by a compact core and an amorphous halo with an angular size of 75″×45″. The spectrum of the halo emission is unusually steep (α 20/90cm ∼−1.5 and α 6/20cm ∼−1.9). Surrounding the compact radio core at the center of the galaxy, a bipolar structure has been observed indicating that an outflow may have been initially collimated to some degree. However, no well-collimated jets have been detected with a resolution of 0.″3