Unexpected circular radio objects at high Galactic latitude

Publications of the Astronomical Society of Australia, vol. 38

Abstract

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.

Authors 8

1. Anna D Kapinska

   National Radio Astronomy Observatory

   Affiliation as printed

   National Radio Astronomy Observatory, PO Box 0, Socorro, NM 87801, USA

2. Bärbel Silvia Koribalski

   Commonwealth Scientific and Industrial Research Organisation · Western Sydney University

   Affiliation as printed

   CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW 1710, Australia

   Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

3. R. Z. E. Alsaberi

   Western Sydney University

   Affiliation as printed

   Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

4. Roland M. Crocker

   Australian National University

   Affiliation as printed

   Australian National University, Canberra, ACT 2600, Australia

5. Miroslav D Filipović

   Western Sydney University

   Affiliation as printed

   Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

6. Kieran Luken

   Commonwealth Scientific and Industrial Research Organisation · Western Sydney University

   Affiliation as printed

   CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW 1710, Australia

   Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

7. Vanessa A. Moss

   Commonwealth Scientific and Industrial Research Organisation

   Affiliation as printed

   CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW 1710, Australia

8. Matthew T. Whiting

   Commonwealth Scientific and Industrial Research Organisation

   Affiliation as printed

   CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW 1710, Australia