ASKAP EMU detection of an Odd Radio Circle (ORC) candidate: J094412-751016 (Anglerfish)
M. D. Filipovi\'c, Z. J. Smeaton, A. C. Bradley, R. Kothes, E. J. Crawford, A. Ahmad, T. Akahori, L. Barnes, C. Bordiu, S. Dai, S. Duchesne, Y. A. Gordon, N. Gupta, A. M. Hopkins, B.s. Koribalski, S. Lazarevi\'c, D. Leahy, K. J. Luken, P. J. Macgregor, A. Mailvaganam, S. Mehmood

TL;DR
This paper reports the detection of a diffuse radio source named Anglerfish, which is a candidate for an Odd Radio Circle (ORC), using EMU survey data, and discusses its possible extragalactic origin and relation to nearby IR sources.
Contribution
The study presents the first identification of a new ORC candidate, analyzing its properties and ruling out other origins such as stellar or supernova remnant scenarios.
Findings
Anglerfish exhibits properties consistent with ORCs, such as size and spectral index.
The associated IR source likely indicates an extragalactic host galaxy.
A physical link to the star V687 Carinae is unlikely.
Abstract
We report diffuse extended radio-continuum emission spatially coinciding with the IR source WISEA J094409.17-751012.8, and a semi-variable star, V687 Carinae. We use 944 MHz radio data from the large-scale Evolutionary Map of the Universe (EMU) survey to analyse this diffuse emission (EMU J094412-751016), which we nickname "Anglerfish". We investigate if the spatially correlated infrared (IR) source, WISEA J094409.17-751012.8, is physically related to Anglerfish. The IR colours of WISEA J094409.17-751012.8 are indicative of an elliptical galaxy, raising the possibility that Anglerfish may belong to the newly-discovered class of extragalactic radio sources known as Odd Radio Circles (ORCs) with WISEA J094409.17-751012.8 as the host galaxy. We also investigate the possibility that Anglerfish is physically related to the star, V687 Carinae, and whether it may be a remnant from a previous…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astrophysical Phenomena and Observations · Stellar, planetary, and galactic studies
