The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP

Craig S. Anderson; George Heald; Shane P. O'Sullivan; John D. Bunton; Ettore Carretti; Aaron P. Chippendale; Jordan D. Collier; Jamie S. Farnes; Bryan M. Gaensler; Lisa Harvey-Smith; Bärbel S. Koribalski; Tom L. Landecker; Emil Lenc; Naomi M. McClure-Griffiths; Daniel Mitchell; Lawrence Rudnick; Jennifer West

doi:10.3390/galaxies6040127

The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP

Craig S. Anderson, George Heald, Shane P. O'Sullivan, John D. Bunton, Ettore Carretti, Aaron P. Chippendale, Jordan D. Collier, Jamie S. Farnes, Bryan M. Gaensler, Lisa Harvey-Smith, Bärbel S. Koribalski, Tom L. Landecker, Emil Lenc, Naomi M. McClure-Griffiths, Daniel Mitchell, Lawrence Rudnick, Jennifer West

Western Sydney University

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We present observations of linear polarisation in the southern radio lobe of Centaurus A, conducted during commissioning of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. We used 16 antennas to observe a 30 square degree region in a single 12-h pointing over a 240 MHz band centred on 913 MHz. Our observations achieve an angular resolution of 26 x 33 arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 Î¼Jy beam-1. The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 105 resolution elements covering the source. We describe several as-yet unreported observational features of the lobe, including its detailed peak Faraday depth structure, and intricate networks of depolarised filaments. These results demonstrate the exciting capabilities of ASKAP for widefield radio polarimetry.

Original language	English
Article number	127
Number of pages	14
Journal	Galaxies
Volume	6
Issue number	4
DOIs	https://doi.org/10.3390/galaxies6040127
Publication status	Published - 2018

Open Access - Access Right Statement

© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Keywords

faraday effect
magnetic fields
radio astronomy
turbulence

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10.3390/galaxies6040127

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Anderson, C. S., Heald, G., O'Sullivan, S. P., Bunton, J. D., Carretti, E., Chippendale, A. P., Collier, J. D., Farnes, J. S., Gaensler, B. M., Harvey-Smith, L., Koribalski, B. S., Landecker, T. L., Lenc, E., McClure-Griffiths, N. M., Mitchell, D., Rudnick, L., & West, J. (2018). The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP. Galaxies, 6(4), Article 127. https://doi.org/10.3390/galaxies6040127

@article{f0da56e104cc49f1bd75258b18de8111,

title = "The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP",

abstract = "We present observations of linear polarisation in the southern radio lobe of Centaurus A, conducted during commissioning of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. We used 16 antennas to observe a 30 square degree region in a single 12-h pointing over a 240 MHz band centred on 913 MHz. Our observations achieve an angular resolution of 26 x 33 arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 {\^I}¼Jy beam-1. The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 105 resolution elements covering the source. We describe several as-yet unreported observational features of the lobe, including its detailed peak Faraday depth structure, and intricate networks of depolarised filaments. These results demonstrate the exciting capabilities of ASKAP for widefield radio polarimetry.",

keywords = "faraday effect, magnetic fields, radio astronomy, turbulence",

author = "Anderson, {Craig S.} and George Heald and O'Sullivan, {Shane P.} and Bunton, {John D.} and Ettore Carretti and Chippendale, {Aaron P.} and Collier, {Jordan D.} and Farnes, {Jamie S.} and Gaensler, {Bryan M.} and Lisa Harvey-Smith and Koribalski, {B{\"a}rbel S.} and Landecker, {Tom L.} and Emil Lenc and McClure-Griffiths, {Naomi M.} and Daniel Mitchell and Lawrence Rudnick and Jennifer West",

year = "2018",

doi = "10.3390/galaxies6040127",

language = "English",

volume = "6",

journal = "Galaxies",

issn = "2075-4434",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "4",

}

Anderson, CS, Heald, G, O'Sullivan, SP, Bunton, JD, Carretti, E, Chippendale, AP, Collier, JD, Farnes, JS, Gaensler, BM, Harvey-Smith, L, Koribalski, BS, Landecker, TL, Lenc, E, McClure-Griffiths, NM, Mitchell, D, Rudnick, L & West, J 2018, 'The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP', Galaxies, vol. 6, no. 4, 127. https://doi.org/10.3390/galaxies6040127

TY - JOUR

T1 - The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP

AU - Anderson, Craig S.

AU - Heald, George

AU - O'Sullivan, Shane P.

AU - Bunton, John D.

AU - Carretti, Ettore

AU - Chippendale, Aaron P.

AU - Collier, Jordan D.

AU - Farnes, Jamie S.

AU - Gaensler, Bryan M.

AU - Harvey-Smith, Lisa

AU - Koribalski, Bärbel S.

AU - Landecker, Tom L.

AU - Lenc, Emil

AU - McClure-Griffiths, Naomi M.

AU - Mitchell, Daniel

AU - Rudnick, Lawrence

AU - West, Jennifer

PY - 2018

Y1 - 2018

N2 - We present observations of linear polarisation in the southern radio lobe of Centaurus A, conducted during commissioning of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. We used 16 antennas to observe a 30 square degree region in a single 12-h pointing over a 240 MHz band centred on 913 MHz. Our observations achieve an angular resolution of 26 x 33 arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 Î¼Jy beam-1. The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 105 resolution elements covering the source. We describe several as-yet unreported observational features of the lobe, including its detailed peak Faraday depth structure, and intricate networks of depolarised filaments. These results demonstrate the exciting capabilities of ASKAP for widefield radio polarimetry.

AB - We present observations of linear polarisation in the southern radio lobe of Centaurus A, conducted during commissioning of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. We used 16 antennas to observe a 30 square degree region in a single 12-h pointing over a 240 MHz band centred on 913 MHz. Our observations achieve an angular resolution of 26 x 33 arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 Î¼Jy beam-1. The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 105 resolution elements covering the source. We describe several as-yet unreported observational features of the lobe, including its detailed peak Faraday depth structure, and intricate networks of depolarised filaments. These results demonstrate the exciting capabilities of ASKAP for widefield radio polarimetry.

KW - faraday effect

KW - magnetic fields

KW - radio astronomy

KW - turbulence

UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:49430

U2 - 10.3390/galaxies6040127

DO - 10.3390/galaxies6040127

M3 - Article

SN - 2075-4434

VL - 6

JO - Galaxies

JF - Galaxies

IS - 4

M1 - 127

ER -

The extraordinary linear polarisation structure of the southern Centaurus A lobe revealed by ASKAP

Abstract

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