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

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 onto the south-eastern part of the ring. We encourage the search for further ORCs in radio surveys to study their properties and origin.

MNRAS Letters, accepted (5 pages, 3 figures)

References in corpus (10)

• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• Australian Square Kilometre Array Pathfinder: I. System Description
• WISE x SuperCOSMOS photometric redshift catalog: 20 million galaxies over 3pi steradians
• Galaxy and Mass Assembly (GAMA): Exploring the WISE Cosmic Web in G12
• On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure
• A wide angle tail radio galaxy in the COSMOS field: evidence for cluster formation
• Searching for the radio remnants of short duration gamma-ray bursts
• Interactions Between Radio Galaxies and Cluster Shocks - 1: Jet Axes Aligned with Shock Normals
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey III: South Galactic Pole data release
• Hydrogen tails, plumes, clouds and filaments

Cited by in corpus (24)

• MeerKAT uncovers the physics of an Odd Radio Circle
• Mysterious Odd Radio Circle near the Large Magellanic Cloud -- An Intergalactic Supernova Remnant?
• Odd Radio Circles and their Environment
• Insights on the origin of ORCs from cosmological simulations
• A comprehensive search for the radio counterpart of GW190814 with the Australian Square Kilometre Array Pathfinder
• Discovery of Peculiar Radio Morphologies with ASKAP using Unsupervised Machine Learning
• New ASKAP Radio Supernova Remnants and Candidates in the Large Magellanic Cloud
• Identifying anomalous radio sources in the EMU Pilot Survey using a complexity-based approach
• Odd Radio Circles as supernovae remnants in the intragroup medium
• Discovery of a circularly symmetric extended diffuse radio emission around an elliptical galaxy with the VLA FIRST survey
• Self-supervised contrastive learning of radio data for source detection, classification and peculiar object discovery
• On energetics and progenitors of Odd Radio Circles: A causal connection with tidal disruption of stars?
• A horseshoe-shaped ring of diffuse emission detected at 1.4 GHz
• Discovery of Odd Radio Circles and Other Peculiars in the First Year of the EMU Survey using Object Detection
• MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre
• Cosmological Zoom-In Simulation of Odd Radio Circles as Merger-Driven Shocks in Galaxy Groups
• The technological and scientific development of ASKAP
• Relighting the fire in Hickson Compact Group (HCG) 15: magnetised fossil plasma revealed by the SKA Pathfinders & Precursors
• The shocking features in the closest rich galaxy cluster Norma
• MeerKAT discovery of 164 compact radio rings toward the Galactic Plane
• The Evolutionary Map of the Universe Pilot Survey
• Single- and double-headed odd radio circles in the LOFAR surveys
• Deep polarimetry study reveals double ring ORC-like structures
• Circular Mystery: Exploring Diffuse Emission Surrounding a Radio Galaxy with uGMRT and VLA Multiwavelength Observations