Optical polarization and imaging of hot spots in radio galaxies

We present subarcsecond optical imaging and polarization observations of fi ve optical hot spot candidates in the classical double radio sources 3C 111 , 3C 303, 3C 351, 3C 390.3, and PKS 2135-147. On the basis of positional co incidence, optical appearance, and polarization, all four 3C sources appear to have genuine optical counterparts to radio hot spots, whereas in PKS 21 35-147 the hot spot candidate turns out to be an unrelated field galaxy. We also confirm the first ever optical double hot spot in the source 3C 351.