Rotation measures for compact variable radio sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Extragalactic Radio Sources, Faraday Effect, Polarized Electromagnetic Radiation, Bl Lacertae Objects, Centimeter Waves, Histograms, Very Large Array (Vla)

Scientific paper

Rotation measures for 31 compact variable extragalactic sources using Very Large Array observations at 18 cm and 20.5 cm wavelengths have been derived. Polarization and total intensity data are presented for these and 29 additional sources at 6 cm and 2 cm wavelengths, 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 about 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. The implications for the magnetic fields in and around compact sources are briefly discussed.

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