MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

C. Bordiu; M. D. Filipović; G. Umana; W. D. Cotton; C. Buemi; F. Bufano; F. Camilo; F. Cavallaro; L. Cerrigone; S. Dai; A. M. Hopkins; A. Ingallinera; T. Jarrett; B. Koribalski; S. Lazarević; P. Leto; S. Loru; P. Lundqvist; J. Mackey; R. P. Norris; J. Payne; G. Rowell; S. Riggi; J. R. Rizzo; A. C. Ruggeri; S. Shabala; Z. J. Smeaton; C. Trigilio; V. Velović

doi:10.1051/0004-6361/202450766

MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

C. Bordiu^*, M. D. Filipović, G. Umana, W. D. Cotton, C. Buemi, F. Bufano, F. Camilo, F. Cavallaro, L. Cerrigone, S. Dai, A. M. Hopkins, A. Ingallinera, T. Jarrett, B. Koribalski, S. Lazarević, P. Leto, S. Loru, P. Lundqvist, J. Mackey, R. P. NorrisJ. Payne, G. Rowell, S. Riggi, J. R. Rizzo, A. C. Ruggeri, S. Shabala, Z. J. Smeaton, C. Trigilio, V. Velović

^*Corresponding author for this work

School of Mathematical and Physical Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	A53
Pages (from-to)	1-7
Number of pages	7
Journal	Astronomy and Astrophysics
Volume	690
DOIs	https://doi.org/10.1051/0004-6361/202450766
Publication status	Published - 1 Oct 2024

Bibliographical note

Keywords

Circumstellar matter
ISM: bubbles
Outflows
Radio continuum: general
Stars: winds

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10.1051/0004-6361/202450766Licence: CC BY

Publisher version (open access)Final published version, 1.14 MBLicence: CC BY

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Bordiu, C., Filipović, 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., Lazarević, S., Leto, P., Loru, S., Lundqvist, P., Mackey, J., ... Velović, V. (2024). MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre. Astronomy and Astrophysics, 690, 1-7. Article A53. https://doi.org/10.1051/0004-6361/202450766

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title = "MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre",

abstract = "We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed K{\'y}klos (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, K{\'y}klos 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.",

keywords = "Circumstellar matter, ISM: bubbles, Outflows, Radio continuum: general, Stars: winds",

author = "C. Bordiu and Filipovi{\'c}, {M. D.} and G. Umana and Cotton, {W. D.} and C. Buemi and F. Bufano and F. Camilo and F. Cavallaro and L. Cerrigone and S. Dai and Hopkins, {A. M.} and A. Ingallinera and T. Jarrett and B. Koribalski and S. Lazarevi{\'c} and P. Leto and S. Loru and P. Lundqvist and J. Mackey and Norris, {R. P.} and J. Payne and G. Rowell and S. Riggi and Rizzo, {J. R.} and Ruggeri, {A. C.} and S. Shabala and Smeaton, {Z. J.} and C. Trigilio and V. Velovi{\'c}",

note = "{\textcopyright} The Authors 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2024",

month = oct,

day = "1",

doi = "10.1051/0004-6361/202450766",

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Bordiu, C, Filipović, MD, Umana, G, Cotton, WD, Buemi, C, Bufano, F, Camilo, F, Cavallaro, F, Cerrigone, L, Dai, S, Hopkins, AM, Ingallinera, A, Jarrett, T, Koribalski, B, Lazarević, S, Leto, P, Loru, S, Lundqvist, P, Mackey, J, Norris, RP, Payne, J, Rowell, G, Riggi, S, Rizzo, JR, Ruggeri, AC, Shabala, S, Smeaton, ZJ, Trigilio, C & Velović, V 2024, 'MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre', Astronomy and Astrophysics, vol. 690, A53, pp. 1-7. https://doi.org/10.1051/0004-6361/202450766

TY - JOUR

T1 - MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

AU - Bordiu, C.

AU - Filipović, M. D.

AU - Umana, G.

AU - Cotton, W. D.

AU - Buemi, C.

AU - Bufano, F.

AU - Camilo, F.

AU - Cavallaro, F.

AU - Cerrigone, L.

AU - Dai, S.

AU - Hopkins, A. M.

AU - Ingallinera, A.

AU - Jarrett, T.

AU - Koribalski, B.

AU - Lazarević, S.

AU - Leto, P.

AU - Loru, S.

AU - Lundqvist, P.

AU - Mackey, J.

AU - Norris, R. P.

AU - Payne, J.

AU - Rowell, G.

AU - Riggi, S.

AU - Rizzo, J. R.

AU - Ruggeri, A. C.

AU - Shabala, S.

AU - Smeaton, Z. J.

AU - Trigilio, C.

AU - Velović, V.

PY - 2024/10/1

Y1 - 2024/10/1

N2 - 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.

AB - 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.

KW - Circumstellar matter

KW - ISM: bubbles

KW - Outflows

KW - Radio continuum: general

KW - Stars: winds

UR - http://www.scopus.com/inward/record.url?scp=85206220330&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/202450766

DO - 10.1051/0004-6361/202450766

M3 - Article

AN - SCOPUS:85206220330

SN - 0004-6361

VL - 690

SP - 1

EP - 7

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A53

ER -

MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

Abstract

Bibliographical note

Keywords

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