Rotation measures for compact variable radio sources

We have derived rotation measures for 31 compact variable extragalactic sources using Very Large Array observations at lambda 18 cm and lambda 20.5 cm. Polarization and total intensity data are presented for these and 29 additional sources at lambda6 cm and lambda2 cm, as well. Maps are also presented for sources with confusing extended structure. The calculated rotation measures are distributed similarly to those of extended sources, and do not appear to change over approx.7 years (using data from Wardle 1977). The intrinsic polarization position angles of compact sources are shown to be similar over wide separations in wavelength. We briefly discuss the implications for the magnetic fields in and around compact sources