Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0716k&link_type=abstract
American Astronomical Society, HEAD meeting #12, #7.16
Astronomy and Astrophysics
Astronomy
Scientific paper
We present evidence that the magnetic fields of the jets of AGN are chiral, i.e. their toroidal component has a preferred handedness which is assessed by the direction of the Faraday Rotation Measure (FRM) gradient with respect to the AGN center. Such chirality is direct consequence of the magnetic field generation process, proposed to be the Poynting-Robertson battery (i.e. the Poynting - Robertson drag of the AGN photon field on the disk electrons) which results in a toroidal current in the direction of the accretion disk motion. This current generates poloidal magnetic loops parallel to the disk Omega at small radii and antiparallel at large. The twist of the footpoints of these loops produces the chirality of the jet magnetic fields with the FRM gradient being in the clockwise direction at small (VLBI) scales, while turning in the opposite (counter-clockwise) direction at larger (VLA) scales. We present the data we have collected in support of this proposal for the origin of AGN jet magnetic fields.
Christodoulou Demetrios
Contopoulos Ioannis
Gabuzda Denise
Kazanas Demosthenes
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