A unique, ring-like radio source with quadrilateral structure detected with machine learning

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dc.contributor.authorLochner, Michelle
dc.contributor.authorRudnick, Lawrence
dc.contributor.authorHeywood, Ian
dc.date.accessioned2024-01-25T13:35:45Z
dc.date.available2024-01-25T13:35:45Z
dc.date.issued2023
dc.description.abstractWe report the discovery of a unique object in the MeerKAT Galaxy Cluster Le gacy Survey (MGCLS) using the machine learning anomaly detection framework ASTRONOMALY. This strange, ring-like source is 30 from the MGCLS field centred on Abell 209, and is not readily explained by simple physical models. With an assumed host galaxy at redshift 0.55, the luminosity (10 25 W Hz −1) is comparable to powerful radio galaxies. The source consists of a ring of emission 175 kpc across, quadrilateral enhanced brightness regions bearing resemblance to radio jets, two ‘ears’ separated by 368 kpc, and a diffuse envelope. All of the structures appear spectrally steep, ranging from −1.0 to −1.5. The ring has high polarization (25 per cent) except on the bright patches (< 10 per cent). We compare this source to the Odd Radio Circles recently discovered in ASKAP data and discuss several possible physical models, including a termination shock from starburst activity, an end-on radio galaxy, and a supermassive black hole merger event. No simple model can easily explain the observed structure of the source. This work, as well as other recent discoveries, demonstrates the power of unsupervised machine learning in mining large data sets for scientifically interesting sources.en_US
dc.identifier.citationLochner, M., Rudnick, L., Heywood, I., Knowles, K. and Shabala, S.S., 2023. A unique, ring-like radio source with quadrilateral structure detected with machine learning. Monthly Notices of the Royal Astronomical Society, 520(1), pp.1439-1446.en_US
dc.identifier.issn00358711
dc.identifier.urihttp://hdl.handle.net/10566/9266
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectMachine learningen_US
dc.subjectActive –radio continuumen_US
dc.subjectGalaxiesen_US
dc.subjectMGCLS fielden_US
dc.subjectMeerKAT Galaxyen_US
dc.titleA unique, ring-like radio source with quadrilateral structure detected with machine learningen_US
dc.typeArticleen_US

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