Faraday Rotation Structure on Kiloparsec Scales in the Giant Radio Lobes of Centaurus A

Abstract

We present the results of an Australia Telescope Compact Array 1.4 GHz spectropolarimetric aperture synthesis survey of 34 square degrees centred on Centaurus A - NGC 5128. A catalogue of 1005 extragalactic compact radio sources in the field to a continuum flux density of 3 mJy/beam is provided along with a table of Faraday rotation measures (RMs) and linear polarised intensities for the 28 percent of sources with high signal-to-noise in linear polarisation. We use the ensemble of 281 background polarised sources as line-of-sight probes of the structure of the giant radio lobes of Centaurus A. This is the first time such a method has been applied to radio galaxy lobes and we explain how it differs from the conventional methods that are often complicated by depth and beam depolarisation effects. We use an RM structure function analysis and report the detection of a turbulent RM signal, with rms of 17 rad/m^2 and scale size 0.3 degrees, associated with the southern giant lobe. We cannot verify whether this signal arises from turbulent structure throughout the lobe or only in a thin skin (or sheath) around the edge, although we favour the latter. The RM signal is modelled as possibly arising from a thin skin with a thermal plasma density equivalent to the Centaurus intragroup medium density and a coherent magnetic field that reverses its sign on a spatial scale of 20 kpc.

Accepted for publication in ApJ, Tables 2 & 3 available in full electronically only

References in corpus (12)

• The outer scale of turbulence in the magneto-ionized Galactic interstellar medium
• Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
• Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited
• High-energy Particle Acceleration and Production of Ultra-high-energy Cosmic Rays in the Giant Lobes of Centaurus A
• Structures of the magnetoionic media around the FR I radio galaxies 3C 31 and Hydra A
• A Radio and Optical Polarization Study of the Magnetic Field in the Small Magellanic Cloud
• Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources
• Interstellar medium disruption in the Centaurus A group
• Fields and Filaments in the Core of the Centaurus Cluster
• Automated Editing of Radio Interferometer Data with Pieflag
• Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNs
• Fossil AGN jets as ultra high energy particle accelerators

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