Mysterious odd radio circle near the large magellanic cloud - an intergalactic supernova remnant?

Filipovic MD, Payne JL, Alsaberi RZE, Norris RP, Macgregor PJ, Rudnick L, Koribalski BS, Leahy D, Ducci L, Kothes R, Andernach H, Barnes L, Bojicic IS, Bozzetto LM, Brose R, Collier JD, Crawford EJ, Crocker RM, Dai S, Galvin TJ, Haberl F, Heber U, Hill T, Hopkins AM, Hurley-Walker N, Ingallinera A, Jarrett T, Kavanagh PJ, Lenc E, Luken KJ, Mackey D, Manojlovic P, Maggi P, Maitra C, Pennock CM, Points S, Riggi S, Rowell G, Safi-Harb S, Sano H, Sasaki M, Shabala S, Stevens J, Van Loon JT, Tothill NFH, Umana G, Urosevic D, Velovic V, Vernstrom T, West JL, Wan Z (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 512

Pages Range: 265-284

Journal Issue: 1

DOI: 10.1093/mnras/stac210

Abstract

We report the discovery of J0624-6948, a low-surface brightness radio ring, lying between the Galactic Plane and the large magellanic cloud (LMC). It was first detected at 888 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP), and with a diameter of similar to 196 arcsec. This source has phenomenological similarities to odd radio circles (ORCs). Significant differences to the known ORCs - a flatter radio spectral index, the lack of a prominent central galaxy as a possible host, and larger apparent size - suggest that J0624-6948 may be a different type of object. We argue that the most plausible explanation for J0624-6948 is an intergalactic supernova remnant due to a star that resided in the LMC outskirts that had undergone a single-degenerate type Ia supernova, and we are seeing its remnant expand into a rarefied, intergalactic environment. We also examine if a massive star or a white dwarf binary ejected from either galaxy could be the supernova progenitor. Finally, we consider several other hypotheses for the nature of the object, including the jets of an active galactic nucleus (30Dor) or the remnant of a nearby stellar super-flare.

Authors with CRIS profile

Involved external institutions

University of Western Sydney Australia (AU) University of Minnesota (UMN) United States (USA) (US) University of Calgary Canada (CA) Eberhard Karls Universität Tübingen Germany (DE) National Research Council / Conseil national de recherches Canada Canada (CA) Universidad de Guanajuato (UG) Mexico (MX) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) Australian National University (ANU) Australia (AU) Curtin University Australia (AU) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) University of Adelaide Australia (AU) Osservatorio Astrofisico di Catania Italy (IT) Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia (AU) University of Keele United Kingdom (GB) Cerro Tololo Inter-American Observatory (CTIO) Chile (CL) University of Manitoba Canada (CA) National Astronomical Observatory of Japan / 国立天文台(NAOJ) Japan (JP) University of Tasmania (UTAS) Australia (AU) University of Belgrade / Универзитет у Београду Serbia (RS) University of Toronto Canada (CA) University of Sydney (USYD) Australia (AU) Université de Strasbourg (UDS) France (FR)

How to cite

APA:

Filipovic, M.D., Payne, J.L., Alsaberi, R.Z.E., Norris, R.P., Macgregor, P.J., Rudnick, L.,... Wan, Z. (2022). Mysterious odd radio circle near the large magellanic cloud - an intergalactic supernova remnant? Monthly Notices of the Royal Astronomical Society, 512(1), 265-284. https://dx.doi.org/10.1093/mnras/stac210

MLA:

Filipovic, Miroslav D., et al. "Mysterious odd radio circle near the large magellanic cloud - an intergalactic supernova remnant?" Monthly Notices of the Royal Astronomical Society 512.1 (2022): 265-284.

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