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http://hdl.handle.net/20.500.12386/29053
Title: | The Extraordinary Linear Polarisation Structure of the Southern Centaurus A Lobe Revealed by ASKAP | Authors: | Anderson, Craig Heald, George O'Sullivan, Shane Bunton, John CARRETTI, ETTORE Chippendale, Aaron Collier, Jordan Farnes, Jamie Gaensler, Bryan Harvey-Smith, Lisa Koribalski, Bärbel Landecker, Tom Lenc, Emil McClure-Griffiths, Naomi Mitchell, Daniel Rudnick, Lawrence West, Jennifer |
Issue Date: | 2018 | Journal: | GALAXIES | Number: | 6 | Issue: | 4 | First Page: | 127 | 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 <mml:math display="inline"> <mml:mrow> <mml:mn>26</mml:mn> <mml:mo>×</mml:mo> <mml:mn>33</mml:mn> </mml:mrow> </mml:math> arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 <mml:math display="inline"> <mml:mi mathvariant="sans-serif">μ</mml:mi> </mml:math>Jy beam <mml:math display="inline"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math>. The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 10 <mml:math display="inline"> <mml:msup> <mml:mrow></mml:mrow> <mml:mn>5</mml:mn> </mml:msup> </mml:math> 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. | URI: | http://hdl.handle.net/20.500.12386/29053 | URL: | https://www.mdpi.com/2075-4434/6/4/127 | ISSN: | 2075-4434 | DOI: | 10.3390/galaxies6040127 | Bibcode ADS: | 2018Galax...6..127A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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galaxies-06-00127-v2 (1).pdf | Pdf editoriale | 2.19 MB | Adobe PDF | View/Open |
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