The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk501 at 8.4-1.6 GHz

Details The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk501 at 8.4-1.6 GHz The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk501 at 8.4-1.6 GHz

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.402..259c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 1, pp. 259-270.

Astronomy and Astrophysics

Astronomy

9

Galaxies: Active, Galaxies: Jets, Galaxies: Magnetic Fields

Scientific paper

Previous very long baseline interferometry (VLBI) observations of the nearby (z = 0.0337) active galactic nucleus (AGN) Mrk501 have revealed a complex total-intensity structure with an approximately 90° misalignment between the jet orientations on parsec and kiloparsec scales. The jet displays a `spine' of magnetic field orthogonal to the jet surrounded by a `sheath' of magnetic field aligned with the jet. Mrk501 is also one of a handful of AGN that are regularly detected at TeV energies, indicating the presence of high-energy phenomena in the core. However, multi-epoch analyses of the VLBI total-intensity structure have yielded only very modest apparent speeds for features in the VLBI jet. We investigate the total-intensity and linear-polarization structures of the parsec- to decaparsec-scale jet of Mrk501 using VLBA observations at 8.4, 5, 2.2 and 1.6 GHz. The rotation-measure distribution displays the presence of a Faraday rotation gradient across an extended stretch of the jet, providing new evidence for a helical magnetic field associated with the jet of this AGN. The position of the radio core from the base of the jet follows the law rcore(ν) ~ ν-1.1+/-0.2, consistent with the compact inner jet region being in equipartition. Hence, we estimate a magnetic field strength of ~40 mG at a distance of 1 pc.

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