Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009arep...53...51g&link_type=abstract
Astronomy Reports, Volume 53, Issue 1, pp.51-58
Astronomy and Astrophysics
Astronomy
98.54.Cm
Scientific paper
The results of simultaneous high-resolution radio observations of the BL Lac object 1749+701 at 5, 8.4, 15, and 22 GHz are presented. The source has a rich, extended structure displaying a number of interesting features: a strongly bent jet, the presence of transverse and longitudinal magnetic field in different regions of the extended structure, and a very non-uniform rotation-measure distribution on parsec scales, in spite of the fact that the integrated rotation measure is modest. Gradients of the rotation measure across the jet are detected, suggesting the presence of a toroidal magnetic-field component. The rotation measure is higher in the core region, apparently due to an enhanced thermal-electron density and magnetic-field strength. A narrow feature is detected in the rotation-measure distribution, whose sign is opposite to that in the surrounding regions of the radio jet, possibly testifying to the presence of a sharp bend in the jet. Images were constructed using weighting in the uv plane, in order to reveal weak polarization in the extended jet structure.
Gabuzda Denise C.
Lisakov M. M.
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