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

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Abstract

We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed KÃ½klos (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 âˆ¼80"³ and is located just âˆ¼6 from the Galactic plane. However, KÃ½klos exhibits an atypical thermal radio-continuum spectrum (Î± = -0.1 Â± 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
Number of pages	7
Journal	Astronomy and Astrophysics
Volume	690
DOIs	https://doi.org/10.1051/0004-6361/202450766
Publication status	Published - 2024

Bibliographical note

Publisher Copyright:
© The Authors 2024.

Keywords

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

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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, 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{\~A}½klos (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 {\^a}ˆ¼80{"}³ and is located just {\^a}ˆ¼6 from the Galactic plane. However, K{\~A}½klos exhibits an atypical thermal radio-continuum spectrum ({\^I}± = -0.1 {\^A}± 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 = "Publisher Copyright: {\textcopyright} The Authors 2024.",

year = "2024",

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

language = "English",

volume = "690",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

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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. 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

Y1 - 2024

N2 - We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed KÃ½klos (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 âˆ¼80"³ and is located just âˆ¼6 from the Galactic plane. However, KÃ½klos exhibits an atypical thermal radio-continuum spectrum (Î± = -0.1 Â± 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 KÃ½klos (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 âˆ¼80"³ and is located just âˆ¼6 from the Galactic plane. However, KÃ½klos exhibits an atypical thermal radio-continuum spectrum (Î± = -0.1 Â± 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

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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