University Of Tasmania
145549 - Discovery of a new extragalactic circular radio source with ASKAP.pdf (2.62 MB)
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Discovery of a new extragalactic circular radio source with ASKAP: ORC J0102-2450

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posted on 2023-05-21, 01:07 authored by Koribalski, BS, Norris, RP, Andernach, H, Rudnick, L, Stanislav ShabalaStanislav Shabala, Filipovic, M, Lenc, E
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 J0102–2450 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.


Publication title

Monthly Notices of the Royal Astronomical Society








School of Natural Sciences


Wiley-Blackwell Publishing Ltd

Place of publication

United Kingdom

Rights statement

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.

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