A Model of Polarisation Rotations in Blazars from Kink Instabilities in Relativistic Jets

Abstract

This paper presents a simple model of polarisation rotation in optically thin relativistic jets of blazars. The model is based on the development of helical (kink) mode of current-driven instability. A possible explanation is suggested for the observational connection between polarisation rotations and optical/gamma-ray flares in blazars, if the current-driven modes are triggered by secular increases of the total jet power. The importance of intrinsic depolarisation in limiting the amplitude of coherent polarisation rotations is demonstrated. The polarisation rotation amplitude is thus very sensitive to the viewing angle, which appears to be inconsistent with the observational estimates of viewing angles in blazars showing polarisation rotations. Overall, there are serious obstacles to explaining large-amplitude polarisation rotations in blazars in terms of current-driven kink modes.

6 pages, 3 figures; Proceedings of the conference "Polarised Emission from Astrophysical Jets", 12-16 June 2017, Ierapetra, Greece; Eds. M. Boettcher, E. Angelakis and J. L. Gómez

References in corpus (9)

• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• Constraining the Location of Gamma-Ray Flares in Luminous Blazars
• Polarization Swings Reveal Magnetic Energy Dissipation in Blazars
• RoboPol: Do optical polarization rotations occur in all blazars?
• Optical EVPA rotations in blazars: testing a stochastic variability model with RoboPol data
• Polarization swings in blazars
• Polarization Signatures of Kink Instabilities in the Blazar Emission Region from Relativistic Magnetohydrodynamic Simulations
• Polarization swings from curved trajectories of the emitting regions
• Polarization of synchrotron emission from relativistic reconfinement shocks

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• The RoboPol Program: Optical Polarimetric Monitoring of Blazars
• Discovering the Mass-Scaled Damping Timescale from Microquasars to Blazars
• Variability and evolution of the optical polarization of a sample of gamma-ray blazars
• Association of the IceCube neutrinos with blazars in the CGRaBS sample
• Progress in Multiwavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges