Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aprs.conf..121g&link_type=abstract
Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium, held at the Institute of Space and astronauti
Astronomy and Astrophysics
Astrophysics
8
Scientific paper
Very Long Baseline Interferometry (VLBI) polarization observations provide information about the magnetic-field structures of the parsec-scale jets in active galactic nuclei. Comparison of polarization observations obtained nearly simultaneously at different frequencies can reveal the presence of Faraday rotation due to thermal plasma along the line of sight from the source to the observer or mixed in with the non-thermal emitting plasma. VLBI polarization observations at 5 and 1.6 GHz were obtained of the compact BL Lacertae object 1803+784 on successive days in July 1998 with global ground arrays plus the orbiting HALCA antenna. The 5 GHz image revealed a smoothly bent jet structure, with the magnetic field transverse all along the jet. This may indicate the presence of a series of relativistic shocks, but more likely reflects the toroidal component of a helical magnetic field associated with the VLBI jet. Comparison of the 1.6 GHz VSOP image and 5 GHz ground-only image suggests that the rotation-measure distribution of 1803+784 is non-uniform on milliarcsecond scales.
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