The Extraordinary Linear Polarisation Structure of the Southern Centaurus A Lobe Revealed by ASKAP

被引：10

作者：

Anderson, Craig S. ^{[1
]}

Heald, George ^{[1
]}

O'Sullivan, Shane P. ^{[2
]}

Bunton, John D. ^{[3
]}

Carretti, Ettore ^{[4
]}

Chippendale, Aaron P. ^{[3
]}

Collier, Jordan D. ^{[5
,6
]}

Farnes, Jamie S. ^{[7
]}

Gaensler, Bryan M. ^{[8
]}

Harvey-Smith, Lisa ^{[5
,9
]}

Koribalski, Barbel S. ^{[3
]}

Landecker, Tom L. ^{[10
]}

Lenc, Emil ^{[3
]}

McClure-Griffiths, Naomi M. ^{[11
]}

Mitchell, Daniel ^{[3
]}

Rudnick, Lawrence ^{[12
]}

West, Jennifer ^{[8
]}

机构：

[1] CSIRO Astron & Space Sci, Perth, WA 6151, Australia

[2] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[3] CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia

[4] INAF, Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[5] Western Sydney Univ, Sch Comp Engn & Math, Locked Bag 1797, Penrith, NSW 2751, Australia

[6] Univ Cape Town, Interuniv Inst Data Intens Astron IDIA, Dept Astron, ZA-7701 Rondebosch, South Africa

[7] Univ Oxford, OeRC, Dept Engn Sci, Oxford OX1 3QG, England

[8] Dunlap Inst Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

[9] Univ New South Wales, Sch Phys, Kensington, NSW 2033, Australia

[10] Natl Res Council Canada, Herzberg Astron, Domin Radio Astrophys Observ, POB 248, Penticton, BC V2A 6K3, Canada

[11] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[12] Univ Minnesota, Minnesota Inst Astrophys, Minneapolis, MN 55455 USA

来源：

GALAXIES | 2018年 / 6卷 / 04期

基金：

澳大利亚研究理事会; 加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

magnetic fields; faraday tomography; magnetic turbulence; AGN;

D O I：

10.3390/galaxies6040127

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 mu Jy beam(-1). The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 10(5) 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 wide-field radio polarimetry.

引用

页数：14

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