Abstract
We present multi wavelength parsec-scale Faraday rotation measure properties of twenty active galactic nuclei, observed with the Very Long Baseline Array simultaneously at 1.4, 1.6, 2.2, 2.4, 4.6, 5.0, 8.1, 8.4 and 15.4 GHz in the full polarization mode. For the observed sources we construct Faraday rotation measure and Faraday-corrected linear polarization maps. Direction of electrical field in the optically thick core regions confirms bimodal distribution. No significant changes of a Faraday rotation measure transverse to the jet direction are found in any of the observed sources. We propose a new magnetic field spatial geometry reconstruction method based on core shift measurements. This technique is applied to the quasar 1004+141. Results indicate an existence of a large scale poloidal magnetic field in the jet of 1004+141.
Highlights
Predicted [1] and observed [2] high linearly polarized emission in the jets of active galactic nuclei (AGN) provides evidence of a presence of highly ordered magnetic fields
We present multi wavelength parsec-scale Faraday rotation measure properties of twenty active galactic nuclei, observed with the Very Long Baseline Array simultaneously at 1.4, 1.6, 2.2, 2.4, 4.6, 5.0, 8.1, 8.4 and 15.4 GHz in the full polarization mode
We propose a new magnetic field spatial geometry reconstruction method based on core shift measurements
Summary
Predicted [1] and observed [2] high linearly polarized emission in the jets of active galactic nuclei (AGN) provides evidence of a presence of highly ordered magnetic fields. Intervening magnetized plasma, surrounding the jet, rotates the plane of an electromagnetic wave and can decrease the degree of polarization, distorting the inner jet characteristics from the ones observed from the Earth. Multi frequency Very Long Baseline Interferometry polarimetric observations can probe these regions, making possible to reconstruct inner jet characteristics and study Faraday media. We use a sample of 20 AGNs [7], observed with the VLBA quasi simultaneously at 9 frequencies in the range from 1.4 to 15.3 GHz in the dual-polarization mode. All these sources (listed in Table 1) have bright jet components and large frequency dependent core shifts.
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