학술논문
MeerKAT uncovers the physics of an Odd Radio Circle
Document Type
Working Paper
Author
Norris, Ray P.; Collier, J. D.; Crocker, Roland M.; Heywood, Ian; Macgregor, Peter; Rudnick, L.; Shabala, Stas; Andernach, Heinz; da Cunha, Elisabete; English, Jayanne; Filipovic, Miroslav; Koribalski, Baaerbel S.; Luken, Kieran; Robotham, Aaron; Sekhar, Srikrishna; Thorne, Jessica E.; Vernstrom, Tessa
Source
Subject
Language
Abstract
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.
Comment: Accepted by MNRAS
Comment: Accepted by MNRAS