MeerKAT uncovers the physics of an odd radio circle

Ray P. Norris, J. D. Collier, Roland M. Crocker, Ian Heywood, Peter Macgregor, L. Rudnick, Stas Shabala, Heinz Andernach, Elisabete Da Cunha, Jayanne English, Miroslav Filipović, Bärbel S. Koribalski, Kieran Luken, Aaron Robotham, Srikrishna Sekhar, Jessica E. Thorne, Tessa Vernstrom

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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 μJy/beam). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarization and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs.

Original languageEnglish
Pages (from-to)1300-1316
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 1 Jun 2022


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