Odd Radio Circles (ORCs) are recently-discovered faint diffuse circles of radio emission, of unknown cause, surrounding galaxies at moderate redshift ($z ~ 0.2-0.6). Here we present detailed new MeerKAT radio images at 1284 MHz of the first ORC, originally discovered with the Australian Square Kilometre Array Pathfinder, with higher resolution (6 arcsec) and sensitivity (~ 2.4 uJy/bm). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarisation and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs.
@article{arxiv.2203.10669,
title = {MeerKAT uncovers the physics of an Odd Radio Circle},
author = {Ray P. Norris and J. D. Collier and Roland M. Crocker and Ian Heywood and Peter Macgregor and L. Rudnick and Stas Shabala and Heinz Andernach and Elisabete da Cunha and Jayanne English and Miroslav Filipovic and Baaerbel S. Koribalski and Kieran Luken and Aaron Robotham and Srikrishna Sekhar and Jessica E. Thorne and Tessa Vernstrom},
journal= {arXiv preprint arXiv:2203.10669},
year = {2022}
}