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Discovery of a new extragalactic circular radio source with ASKAP: ORC J0102-2450


Koribalski, BS and Norris, RP and Andernach, H and Rudnick, L and Shabala, SS and Filipovic, M and Lenc, E, Discovery of a new extragalactic circular radio source with ASKAP: ORC J0102-2450, Monthly Notices of the Royal Astronomical Society, 505, (1) pp. L11-L15. ISSN 1745-3925 (2021) [Refereed Article]

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society : 2021 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnrasl/slab041


We present the discovery of another odd radio circle (ORC) with the Australian Square Kilometre Array Pathfinder (ASKAP) at 944 MHz. The observed radio ring, ORC J0102-2450, has a diameter of ∼70 arcsec or 300 kpc, if associated with the central elliptical galaxy DES J010224.33-245039.5 (𝓏 ∼ 0.27). Considering the overall radio morphology (circular ring and core) and lack of ring emission at non-radio wavelengths, we investigate if ORC J01022450 could be the relic lobe of a giant radio galaxy seen end on or the result of a giant blast wave. We also explore possible interaction scenarios, for example, with the companion galaxy, DES J010226.15-245104.9, located in or projected on to the south-eastern part of the ring. We encourage the search for further ORCs in radio surveys to study their properties and origin.

Item Details

Item Type:Refereed Article
Keywords:radio continuum: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:145549
Year Published:2021
Web of Science® Times Cited:5
Deposited By:Physics
Deposited On:2021-07-26
Last Modified:2021-09-22
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