Polarization in Blazars

Details Polarization in Blazars Polarization in Blazars

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54l..55f&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.5, pp.L55-L58

Astronomy and Astrophysics

Astronomy

10

Galaxies: Active, Galaxies: Bl Lacertae Objects, Galaxies: Jets, Galaxies: Quasars

Scientific paper

Both in the Faraday Rotation Measure and the intrinsic polarization angle, new features are revealed to indicate a helical magnetic field operating along the jet of the bright active galactic nucleus 3C 273. The helical field has been suggested to be related to the formation and collimation of jets by magnetohydrodynamic models. The distribution of the rotation measure shows a systematic gradient with respect to the jet axis, which is expected by a helical magnetic field. In addition, the helical field can consistently explain two types in the direction of the projected magnetic field: parallel and perpendicular to the jet axis. Further, if the helical magnetic field is generated by winding up of an initial field by rotation of the accretion disk, we can uniquely determine the direction of the disk rotation, since the jet is approaching us.

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