Discovery of a new extragalactic circular radio source with ASKAP: ORC&nbsp;J0102–2450

Koribalski, Bärbel S.; Norris, Ray P.; Andernach, Heinz; Rudnick, Lawrence; Shabala, Stanislav; Filipović, Miroslav; Lenc, Emil

doi:10.1093/mnrasl/slab041

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

Journal Article · Fri Apr 30 00:00:00 EDT 2021 · Monthly Notices of the Royal Astronomical Society: Letters

DOI:https://doi.org/10.1093/mnrasl/slab041· OSTI ID:1806349

; ; ; ; ; Filipović, Miroslav;

ABSTRACT

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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1806349

Journal Information:: Monthly Notices of the Royal Astronomical Society: Letters, Journal Name: Monthly Notices of the Royal Astronomical Society: Letters Journal Issue: 1 Vol. 505; ISSN 1745-3925

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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