Spine-sheath polarization structures in four active galactic nuclei jets

Details Spine-sheath polarization structures in four active galactic nuclei jets Spine-sheath polarization structures in four active galactic nuclei jets

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.356..859p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 356, Issue 3, pp. 859-871.

Astronomy and Astrophysics

Astronomy

40

Magnetic Fields, Polarization, Bl Lacertae Objects: General

Scientific paper

We present the results of multifrequency (15 + 8 + 5GHz) polarization Very Long Baseline Array (VLBA) observations of the three BL Lacertae objects 0745+241, 1418+546 and 1652+398 together with 5-GHz VLBI Space Observatory Programme (VSOP) observations of 1418+546 and 1.6- and 5-GHz VSOP observations of the blazar 1055+018. The jets of all these sources have polarization structure transverse to the jet axis, with the polarization E vectors aligned with the jet along the jet spine and `sheaths' of orthogonal E vectors at one or both edges of the jet. The presence of polarization aligned with the jet near the `spine' may indicate that the jets are associated with helical B fields that propogate outward with the jet flow; the presence of orthogonal polarization near the edges of the jet may likewise be a consequence of a helical jet B field, or may be owing to an interaction with the ambient medium on parsec scales. We have tentatively detected interknot polarization in 1055+018 with E aligned with the local jet direction, consistent with the possibility that the jet of this source is associated with a helical B field.

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