Unexpected Circular Radio Objects at High Galactic Latitude

Aidan Hotan; Andrew M. Hopkins; Andrew N. O'Brien; Anna D. Kapinska; Baerbel S. Koribalski; Catherine Hale; Craig Anderson; Devika Shobhana; E. Crawford; Emil Lenc

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arxiv 2006.14805 v2 pith:XEUJ6IEL submitted 2020-06-26 astro-ph.GA

Unexpected Circular Radio Objects at High Galactic Latitude

Ray P. Norris , Huib T. Intema , Anna D. Kapinska , Baerbel S. Koribalski , Emil Lenc , L. Rudnick , Rami Alsaberi , Craig Anderson

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G. E. Anderson E. Crawford Roland Crocker Jayanne English Miroslav D. Filipovic Andrew M. Hopkins Natasha Hurley-Walker Susumu Inoue Kieran Luken Peter Macgregor Pero Manojlovic Josh Marvil Andrew N. O'Brien Wasim Raja Devika Shobhana Tiziana Venturi Jordan D. Collier Catherine Hale Aidan Hotan Vanessa Moss Matthew Whiting

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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.

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