SIMBAD references

2014MNRAS.444..172G - Mon. Not. R. Astron. Soc., 444, 172-184 (2014/October-2)

Are spine-sheath polarization structures in the jets of active galactic nuclei associated with helical magnetic fields?


Abstract (from CDS):

One possible origin for polarization structures across jets of active galactic nuclei (AGNs) with a central `spine' of orthogonal magnetic field and a `sheath' of longitudinal magnetic field along one or both edges of the jet is the presence of a helical jet magnetic field. Simultaneous Very Long Baseline Array (VLBA) polarization observations of AGN displaying partial or full spine-sheath polarization structures were obtained at 4.6, 5.0, 7.9, 8.9, 12.9 and 15.4 GHz, in order to search for additional evidence for helical jet magnetic fields, such as transverse Faraday rotation gradients (due to the systematic change in the line-of-sight magnetic-field component across the jet).
Result. for eight sources displaying monotonic transverse Faraday rotation gradients with significances ≥ 3σ are presented here. Reversals in the directions of the transverse RM gradients with distance from the core or with time are detected in three of these AGNs. These can be interpreted as evidence for a nested helical magnetic field structure, with different directions for the azimuthal field component in the inner and outer regions of helical field. The results presented here support the idea that many spine-sheath polarization structures reflect the presence of helical magnetic fields being carried by these jets.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): magnetic fields - polarization - galaxies: active - galaxies: jets

CDS comments: In references, the right bibcode for Simard-Normandin et al. 1981 is 1981ApJS...45...97S.

Simbad objects: 12

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