MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre

Autor:	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.
Rok vydání:	2024
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Solar and Stellar Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1051/0004-6361/202450766
Popis:	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 ({\alpha} = -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. Comment: 7 pages, 5 figures, accepted in A&A
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2408.07727 Zobrazit plný text záznamu View this record from Arxiv