Parsec Scale Faraday-Rotation Structure Across the Jets of 9 Active Galactic Nuclei

Abstract

A number of groups have recently been active in searching for gradients in the ob- served Faraday rotation measure (RM) across jets of Active Galactic Nuclei (AGNs) on various scales and estimating their reliability. Such RM structures provide direct evidence for the presence of an azimuthal magnetic field component, which may be associated with a helical jet magnetic field, as is expected based on the results of many theoretical studies. We present new parsec-scale RM maps of 4 AGNs here, and analyze their transverse RM structures together with those for 5 previously published RM maps. All these jets display transverse RM gradients with significances of at least 3σ. This is part of an ongoing effort to establish how common transverse RM gradients that may be associated with helical or toroidal magnetic fields are in AGNs on parsec scales.

arXiv comment11 pages, 4 figures, 3 tables

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Cited by in corpus (19)

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• Polarimetric properties of Event Horizon Telescope targets from ALMA
• Reading M87's DNA: A Double Helix revealing a large scale Helical Magnetic Field
• Total and linearly polarized synchrotron emission from overpressured magnetized relativistic jets
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• Synchrotron intensity plots from a relativistic stratified jet
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