Revealing the Faraday Depth Structure of Radio Galaxy NGC 612 with Broad-Band Radio Polarimetric Observations
arXiv:1801.08237 · doi:10.1093/mnras/sty269
Abstract
We present full-polarisation, broadband observations of the radio galaxy NGC 612 (PKS B0131-637) from 1.3 to 3.1 GHz using the Australia Telescope Compact Array. The relatively large angular scale of the radio galaxy makes it a good candidate with which to investigate the polarisation mechanisms responsible for the observed Faraday depth structure. By fitting complex polarisation models to the polarised spectrum of each pixel, we find that a single polarisation component can adequately describe the observed signal for the majority of the radio galaxy. While we cannot definitively rule out internal Faraday rotation, we argue that the bulk of the Faraday rotation is taking place in a thin skin that girts the polarised emission. Using minimum energy estimates, we find an implied total magnetic field strength of 4.2 microG.
Accepted: 22 January 2018
References in corpus (10)
- Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
- Estimating extragalactic Faraday rotation
- A Global Probe of Cosmic Magnetic Fields to High Redshifts
- Structures of the magnetoionic media around the FR I radio galaxies 3C 31 and Hydra A
- The properties of the young stellar populations in powerful radio galaxies at low and intermediate redshifts
- Ionized Gas in the Smith Cloud
- Metal enriched gaseous halos around distant radio galaxies: Clues to feedback in galaxy formation
- Enormous disc of cool gas surrounding the nearby powerful radio galaxy NGC 612 (PKS 0131-36)
- Detection of a Coherent Magnetic Field in the Magellanic Bridge through Faraday Rotation
- Detection of a ~20 kpc coherent magnetic field in the outskirt of merging spirals: the Antennae galaxies
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- The POlarised GLEAM Survey (POGS) I: First Results from a Low-Frequency Radio Linear Polarisation Survey of the Southern Sky
- A Broadband Spectro-polarimetric View of the NVSS Rotation Measure Catalogue I: Breaking the nπ-ambiguity
- Faraday rotation study of NGC 612 (PKS 0131-36): a hybrid radio source and its magnetised circumgalactic environment
- Analyzing the Intrinsic Magnetic Field in the Galactic Center Radio Arc
- Wide-band Rotation Measure Synthesis
- Observations and Simulations of Radio Emission and Magnetic Fields in Minkowski's Object