Unexpected circular radio objects at high Galactic latitude. (18th January 2021)

• Record Type: Journal Article
• Authors: Norris, Ray P.; Intema, Huib T.; Kapińska, Anna D.; Koribalski, Bärbel S.; Lenc, Emil; Rudnick, L.; Alsaberi, Rami Z. E.; Anderson, Craig; Anderson, G. E.; Crawford, E.; Crocker, Roland; English, Jayanne; Filipović, Miroslav D.; Galvin, Tim J.; Hopkins, Andrew M.; Hurley-Walker, Natasha; Inoue, Susumu; Luken, Kieran; Macgregor, Peter J.; Manojlović, Pero; Marvil, Josh; O'Brien, Andrew N.; Park, Laurence; Raja, Wasim; Shobhana, Devika; Venturi, Tiziana; Collier, Jordan D.; Hale, Catherine; Hotan, Aidan; Moss, Vanessa; Whiting, Matthew;
• Is Part Of: Publications of the Astronomical Society of Australia. Volume 38(2021)
• Publication Date: 2021-01-18
• Subjects: Extragalactic radio sources; Astronomy -- Periodicals; Southern sky (Astronomy) -- Periodicals; Astrophysics -- Periodicals; Periodicals; 520.5
• DOI: 10.1017/pasa.2020.52
• Languages: English
• ISSNs: 1323-3580

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.