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MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre
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Number of Authors: 292024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 690, article id A53Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2024. Vol. 690, article id A53
Keywords [en]
Circumstellar matter, ISM: bubbles, Outflows, Radio continuum: general, Stars: winds
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-237325DOI: 10.1051/0004-6361/202450766ISI: 001322237700025Scopus ID: 2-s2.0-85206220330OAI: oai:DiVA.org:su-237325DiVA, id: diva2:1921555
Available from: 2024-12-16 Created: 2024-12-16 Last updated: 2024-12-16Bibliographically approved

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Lundqvist, Peter

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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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