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, G. E., Anderson, E. Crawford, Roland Crocker, Jayanne English, Miroslav D., Filipovic, Andrew M. Hopkins, Natasha Hurley-Walker, Susumu Inoue, Kieran
TL;DR
This paper reports the discovery of a new class of circular, edge-brightened radio objects at high galactic latitude, which are unlike previously known objects and lack a clear explanation.
Contribution
The study identifies a novel class of circular radio objects in the ASKAP survey, expanding the diversity of known radio sources and challenging existing formation models.
Findings
Discovered a new class of circular radio objects
Objects are about one arcmin in diameter and edge-brightened
No compelling mechanism currently explains these objects
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.
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