Unexpected circular radio objects at high Galactic latitude

Ray P. Norris*: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Huib T. Intema: Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA6845, Australia Leiden Observatory, Leiden University, PO Box 9513, Leiden, NL-2300RA, The Netherlands
Anna D. Kapińska: Affiliation:
National Radio Astronomy Observatory, PO Box 0, Socorro, NM87801, USA
Bärbel S. Koribalski: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Emil Lenc: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
L. Rudnick: Affiliation:
University of Minnesota, 100 Church St SE, Minneapolis, MN55455, USA
Rami Z. E. Alsaberi: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Craig Anderson: Affiliation:
National Radio Astronomy Observatory, PO Box 0, Socorro, NM87801, USA
G. E. Anderson: Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA6845, Australia
E. Crawford: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Roland Crocker: Affiliation:
Australian National University, Canberra, ACT2600, Australia
Jayanne English: Affiliation:
University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
Miroslav D. Filipović: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Tim J. Galvin: Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA6845, Australia
Andrew M. Hopkins: Affiliation:
Australian Astronomical Optics, Macquarie University, 105 Delhi Rd, North Ryde, NSW2113, Australia
Natasha Hurley-Walker: Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA6845, Australia
Susumu Inoue: Affiliation:
iTHEMS, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Kieran Luken: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Peter J. Macgregor: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Pero Manojlović: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Josh Marvil: Affiliation:
National Radio Astronomy Observatory, PO Box 0, Socorro, NM87801, USA
Andrew N. O’Brien: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia Center for Gravitation, Cosmology and Astrophysics, Department of Physics, University of Wisconsin-Milwaukee, PO Box 413, Milwaukee, WI53201, USA
Laurence Park: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Wasim Raja: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Devika Shobhana: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
Tiziana Venturi: Affiliation:
Istituto di Radioastronomia, INAF, Via Gobetti 101, Bologna40129, Italy
Jordan D. Collier: Affiliation:
Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia The Inter-University Institute for Data Intensive Astronomy (IDIA), Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
Catherine Hale: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Aidan Hotan: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Vanessa Moss: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
Matthew Whiting: Affiliation:
CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW1710, Australia
*: Author for correspondence: Ray P. Norris, E-mail: raypnorris@gmail.com

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Abstract

We have found a class of circular radio objects in the Evolutionary Map of the Universe Pilot Survey, using the Australian Square Kilometre Array Pathfinder telescope. The objects appear in radio images as circular edge-brightened discs, about one arcmin diameter, that are unlike other objects previously reported in the literature. We explore several possible mechanisms that might cause these objects, but none seems to be a compelling explanation.

Keywords

Extragalactic radio sources

Type: Research Article
Information: Publications of the Astronomical Society of Australia , Volume 38 , 2021 , e003

DOI: https://doi.org/10.1017/pasa.2020.52 [Opens in a new window]

NASA ADS Abstract Service [Opens in a new window]
Copyright: © The Author(s), 2021. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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Unexpected circular radio objects at high Galactic latitude

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