2024A&A...690A..53B

Query : 2024A&A...690A..53B

2024A&A...690A..53B - Astronomy and Astrophysics, volume 690A53 (2024/10-1)

MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre.

BORDIU C., FILIPOVIC M.D., UMANA G., COTTON W.D., BUEMI C., BUFANO F., CAMILO F., CAVALLARO F., CERRIGONE L., DAI S., HOPKINS A.M., INGALLINERA A., JARRETT T., KORIBALSKI B., LAZAREVIC S., LETO P., LORU S., LUNDQVIST P., MACKEY J., NORRIS R.P., PAYNE J., ROWELL G., RIGGI S., RIZZO J.R., RUGGERI A.C., SHABALA S., SMEATON Z.J., TRIGILIO C. and VELOVIC V.

Abstract (from CDS):

We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed Kýklos (J1802-3353), with MeerKAT UHF and L-band observations. The radio ring, which resembles the recently discovered odd radio circles (ORCs), has a diameter of ∼80″ and is located just ∼6° from the Galactic plane. However, Kýklos exhibits an atypical thermal radio-continuum spectrum (α = -0.1 ± 0.3), which led us to explore different possible formation scenarios. We concluded that a circumstellar shell around an evolved massive star, possibly a Wolf-Rayet, is the most convincing explanation with the present data.

Abstract Copyright: © The Authors 2024

Journal keyword(s): circumstellar matter - stars: winds - outflows - ISM: bubbles - radio continuum: general

Simbad objects: 18

goto Full paper

goto View the references in ADS

Number of rows : 18
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 RX J0045.4+4154 No* 00 45 28.80 +41 54 10.1           ~ 263 1
3 ORC J0102-2450 Rad 01 02 24.50 -24 50 38.1           ~ 14 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 ORC J0624-6948 Rad 06 24 17.78 -69 48 37.8           ~ 14 0
6 ORC J1027-4422 Rad 10 27 14.38 -44 22 56.7           ~ 4 0
7 ORC J1555+2726 Rad 15 55 24.65 +27 26 33.8           ~ 17 1
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 WR 102-25 WR* 17 59 35.6016463608 -30 51 32.334318576     15.8     ~ 4 0
10 HD 164270 WR* 18 01 43.1453595672 -32 42 55.161329040 8.52 8.97 8.74 9.51   WC9d+? 233 0
11 Gaia DR3 4042247331685419136 * 18 02 39.9541983233 -33 53 42.246684109           ~ 1 0
12 Gaia DR3 4042247335830104960 * 18 02 42.0684369647 -33 53 27.219520543           ~ 1 0
13 2MASS J18024263-3353280 NIR 18 02 42.63528 -33 53 28.0896           ~ 1 0
14 HD 164455 * 18 02 42.9205924368 -33 53 21.054867828 6.7 7.35 7.5     B2III/IV 38 0
15 WR 109 WR* 18 07 50.8972634088 -35 10 25.118702292           WN3 65 0
16 ORC J2058-5736a Rad 20 58 42.80 -57 36 58.0           ~ 10 0
17 ORC J2058-5736b Rad 20 58 56.30 -57 36 55.0           ~ 9 0
18 ORC J2103-6200 Rad 21 02 58.30 -62 00 16.0           ~ 17 0

To bookmark this query, right click on this link: simbad:objects in 2024A&A...690A..53B and select 'bookmark this link' or equivalent in the popup menu