2022MNRAS.512..265F

Query : 2022MNRAS.512..265F

2022MNRAS.512..265F - Mon. Not. R. Astron. Soc., 512, 265-284 (2022/May-1)

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

FILIPOVIC M.D., PAYNE J.L., ALSABERI R.Z.E., NORRIS R.P., MACGREGOR P.J., RUDNICK L., KORIBALSKI B.S., LEAHY D., DUCCI L., KOTHES R., ANDERNACH H., BARNES L., BOJICIC I.S., BOZZETTO L.M., BROSE R., COLLIER J.D., CRAWFORD E.J., CROCKER R.M., DAI S., GALVIN T.J., HABERL F., HEBER U., HILL T., HOPKINS A.M., HURLEY-WALKER N., INGALLINERA A., JARRETT T., KAVANAGH P.J., LENC E., LUKEN K.J., MACKEY D., MANOJLOVIC P., MAGGI P., MAITRA C., PENNOCK C.M., POINTS S., RIGGI S., ROWELL G., SAFI-HARB S., SANO H., SASAKI M., SHABALA S., STEVENS J., VAN LOON J.T., TOTHILL N.F.H., UMANA G., UROSEVIC D., VELOVIC V., VERNSTROM T., WEST J.L. and WAN Z.

Abstract (from CDS):

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 ∼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.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: flare - ISM: supernova remnants - galaxies: jets - Magellanic Clouds - radio continuum: general

Nomenclature: Fig. 5, Table 2: [FPA2022] ASKAP JHHMMSS.s+DDMMSS.s N=5.

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SNR G119.5+10.2 SNR 00 06.6 +72 47           ~ 268 1
2 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1254 1
3 LEDA 783409 G 00 45 06.9972489744 -25 01 46.949630844   17.326   16.085   ~ 6 0
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 422 1
7 SXP 1062 HXB 01 27 45.9424650912 -73 32 56.376382920   14.32 14.36     B0.5(III)e 95 1
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
9 NGC 1265 rG 03 18 15.674 +41 51 27.94   14.7       ~ 386 2
10 SNR G152.4-02.1 SNR 04 07 +49.3           ~ 21 0
11 HE 0437-5439 HS* 04 38 12.7828168224 -54 33 11.834984736 15.37 16.18 16.42     sdB+F 81 0
12 LHA 120-S 147 LP? 04 54 03.4657331448 -70 59 32.142989220   12.8   15.57   K5e 22 0
13 SNR G156.2+05.7 SNR 04 58 40 +51 50.0           ~ 126 0
14 LHA 120-N 103B EmO 05 08 47.8 -68 45 39           ~ 244 1
15 SNR B0509-67.5 SNR 05 09 31 -67 31.3           ~ 248 0
16 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 343 0
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
18 ICRF J052930.0-724528 QSO 05 29 30.04217573 -72 45 28.5075004   19.61       ~ 102 1
19 SN 1987A SN* 05 35 27.98840 -69 16 11.1134           SNIIpec 5203 2
20 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
21 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 976 3
22 SNR G190.9-02.2 SNR 06 02 +18.4           ~ 19 0
23 LEDA 89499 Sy2 06 02 53.95560 -71 03 10.1448   15.6       ~ 107 1
24 SNR G182.4+04.3 SNR 06 08.2 +29 00           ~ 34 0
25 DES J061909.04-555843.7 ? 06 19 09.04 -55 58 43.7           ~ 2 0
26 [FPA2022] ASKAP J062352.3-694813.2 Rad 06 23 52.32 -69 48 13.2           ~ 1 0
27 [FPA2022] ASKAP J062355.8-695016.8 Rad 06 23 55.83 -69 50 16.8           ~ 1 0
28 [FPA2022] ASKAP J062357.3-694857.8 Rad 06 23 57.35 -69 48 57.8           ~ 1 0
29 2MASS J06240216-6948116 * 06 24 02.1513365496 -69 48 11.640002184           ~ 3 0
30 [FPA2022] ASKAP J062402.6-694932.8 Rad 06 24 02.61 -69 49 32.8           ~ 1 0
31 CWISE J062410.40-694946.0 X 06 24 10.6 -69 49 47           ~ 1 0
32 ORC J0624-6948 Rad 06 24 17.78 -69 48 37.8           ~ 14 0
33 [FPA2022] ASKAP J062418.1-694834.3 Rad 06 24 18.17 -69 48 34.3           ~ 1 0
34 XMMU J062422.5-694756 * 06 24 22.7487336900 -69 47 55.434975867           ~ 1 0
35 CWISE J062424.40-694853.5 X 06 24 24.8 -69 48 53           ~ 1 0
36 XMMU J062426.7-694726 X 06 24 26.7 -69 47 26           ~ 1 0
37 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
38 AT 2018bej No* 06 26 20.760 -69 45 46.30           ~ 5 0
39 SNR G181.1+09.5 SNR 06 26 45.5 +32 31 00           ~ 21 0
40 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 229 0
41 PMN J0811+0237 BLL 08 12 01.8570721368 +02 37 33.086136180           ~ 47 1
42 US 708 HS* 09 33 20.8631859264 +44 17 05.495440452   18.5 18.8     sdOHe 103 0
43 SNR G295.5+09.7 SNR 12 09 40 -52 25.0           ~ 301 1
44 7C 134351.89+534754.00 BLL 13 45 45.3552682440 +53 32 52.289759544   18.45 17.89 15.8   ~ 64 1
45 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1407 1
46 NAME Kepler's SN SNR 17 30 40.51 -21 29 14.4           ~ 851 3
47 SNR G001.9+00.3 SNR 17 48 46.02 -27 09 52.0           ~ 243 1
48 SNR G011.2-00.3 SNR 18 11 28.9 -19 25 29           ~ 305 1
49 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
50 SNR G065.1+00.6 SNR 19 54.7 +28 35           ~ 65 0
51 SNR G093.2+06.7 SNR 20 52 25 +55 19.3           ~ 87 0
52 SNR G096.0+02.0 SNR 21 30 30 +53 59.0           ~ 24 0
53 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1
54 SNR G114.3+00.3 SNR 23 37 05.780 +61 51 01.69           ~ 130 1
55 V* OU And Ro* 23 49 40.9595121216 +36 25 31.013370732   6.69 5.90     G1IIICaIIem 159 0
56 NAME Local Group GrG ~ ~           ~ 9325 0

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