Unexpected circular radio objects at high Galactic latitude

@article{Norris2021UnexpectedCR,
  title={Unexpected circular radio objects at high Galactic latitude},
  author={R. Norris and H. Intema and A. Kapińska and B. Koribalski and E. Lenc and L. Rudnick and R. Alsaberi and C. Anderson and G. Anderson and E. Crawford and R. Crocker and J. English and M. Filipovi{\'c} and T. Galvin and A. Hopkins and N. Hurley-Walker and S. Inoue and K. Luken and P. Macgregor and P. Manojlovic and J. Marvil and A. O’Brien and Laurence A. F. Park and W. Raja and Devika Shobhana and T. Venturi and J. Collier and C. Hale and A. Hotan and V. Moss and M. Whiting},
  journal={Publications of the Astronomical Society of Australia},
  year={2021},
  volume={38}
}
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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