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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
