Reading M87's DNA: A Double Helix revealing a large scale Helical Magnetic Field

Abstract

We present unprecedented high fidelity radio images of the M87 jet. We analyzed Jansky Very Large Array (VLA) broadband, full polarization, radio data from 4 to 18 GHz. The observations were taken with the most extended configuration (A configuration), which allow the study of the emission of the jet up to kpc scales with a linear resolution $\sim$10 pc. The high sensitivity and resolution of our data allow to resolve the jet width. We confirm a double-helix morphology of the jet material between $\sim$300 pc and $\sim$1 kpc. We found a gradient of the polarization degree with a minimum at the projected axis and maxima at the jet edges, and a gradient in the Faraday depth with opposite signs at the jet edges. We also found that the behavior of the polarization properties along the wide range of frequencies is consistent with internal Faraday depolarization. All these characteristics strongly support the presence of a helical magnetic field in the M87 jet up to 1 kpc from the central black hole although the jet is most likely particle dominated at these large scales. Therefore, we propose a plausible scenario in which the helical configuration of the magnetic field has been maintained to large scales thanks to the presence of Kelvin-Helmholtz instabilities.

Published on ApJL

References in corpus (17)

• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VIII. Faraday rotation in parsec-scale AGN jets
• Numerical modelling of the lobes of radio galaxies in cluster environments II: Magnetic field configuration and observability
• Faraday rotation and polarization gradients in the jet of 3C~120: Interaction with the external medium and a helical magnetic field?
• Faraday rotation in the jet of M87 inside the Bondi radius: indication of winds from hot accretion flows confining the relativistic jet
• Anatomy of helical relativistic jets: The case of S5 0836+710
• The role of Kelvin-Helmholtz instability in the internal structure of relativistic outflows. The case of the jet in 3C 273
• The internal structure of overpressured, magnetized, relativistic jets
• Transverse Faraday-Rotation Gradients Across the Jets of 15 Active Galactic Nuclei
• Linear polarization in the nucleus of M87 at 7 mm and 1.3 cm
• Parsec Scale Faraday-Rotation Structure Across the Jets of 9 Active Galactic Nuclei
• Physical properties of the jet in 0836+710 revealed by its transversal structure
• A Magnetohydrodynamic Model of The M87 Jet. II. Self-consistent Quad-shock Jet Model for Optical Relativistic Motions and Particle Acceleration
• Derivation of the physical parameters of the jet in S5 0836+710 from stability analysis
• Multi-Wavelength Polarimetry and Spectral Study of M87 Jet During 2002-2008
• Message in a Bottle: Unveiling the Magneto-Ionic Complexity of AGNs through the Stokes QU-Fitting Technique

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• Transverse Oscillations and Wave Propagation in the Magnetically Dominated M87 Jet
• Constraints on axion-like particles from ultra-high-energy observations of M87 with the HAWC observatory
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