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MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

Fuente: arXiv

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Bibliographic Details
Main Authors:	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., Velovic, V.
Format:	Preprint
Published:	2024
Subjects:	Astrophysics of Galaxies Solar and Stellar Astrophysics
Online Access:	Acceder al recurso
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_version_	1866911989344763904
author	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. Velovic, V.
author_facet	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. Velovic, V.
contents	We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed Kyklos (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 arcsec and is located just 6 deg from the Galactic plane. However, Kyklos 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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2408_07727
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	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. Velovic, V. Astrophysics of Galaxies Solar and Stellar Astrophysics We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed Kyklos (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 arcsec and is located just 6 deg from the Galactic plane. However, Kyklos 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.
title	MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre
topic	Astrophysics of Galaxies Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2408.07727