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MeerKAT uncovers the physics of an Odd Radio Circle

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arxiv 2203.10669 v1 pith:F53XAIDR submitted 2022-03-20 astro-ph.GA

MeerKAT uncovers the physics of an Odd Radio Circle

classification astro-ph.GA
keywords radiocirclesimagesmeerkatorcsadditionarcsarcsec
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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