| Issue |
A&A
Volume 647, March 2021
|
|
|---|---|---|
| Article Number | A110 | |
| Number of page(s) | 10 | |
| Section | Galactic structure, stellar clusters and populations | |
| DOI | https://doi.org/10.1051/0004-6361/202039172 | |
| Published online | 17 March 2021 | |
Radio observations of massive stars in the Galactic centre: The Arches Cluster⋆
1
Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain
e-mail: gallego@iaa.es
2
European Southern Observatory (ESO), Alonso de Córdova 3107 Vitacura, Casilla 19001, Santiago de Chile, Chile
3
Centro de Astrobiología (CSIC/INTA), Ctra. de Ajalvir Km. 4, 28850 Torrejón de Ardoz, Madrid, Spain
4
CIERA, Department of Physics and Astronomy Northwestern University, Evanston, IL 60208, USA
5
Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70264, Ciudad de México 04510, México
6
Max-Planck-Institut für Astronomie, Königstuhl 17, Heidelberg 69 117, Germany
7
Centro Astronómico Hispano-Alemán (CSIC-MPG), Observatorio Astronómico de Calar Alto, Sierra de los Filabres, 04550 Gérgal, Almería, Spain
8
10911 NE 157th St, Bothell, WA 98011, USA
Received:
12
August
2020
Accepted:
16
December
2020
We present high-angular-resolution radio observations of the Arches cluster in the Galactic centre, one of the most massive young clusters in the Milky Way. The data were acquired in two epochs and at 6 and 10 GHz with the Karl G. Jansky Very Large Array. The rms noise reached is three to four times better than during previous observations and we have almost doubled the number of known radio stars in the cluster. Nine of them have spectral indices consistent with thermal emission from ionised stellar winds, one is a confirmed colliding wind binary, and two sources are ambiguous cases. Regarding variability, the radio emission appears to be stable on timescales of a few to ten years. Finally, we show that the number of radio stars can be used as a tool for constraining the age and/or mass of a cluster and also its mass function.
Key words: Galaxy: center / open clusters and associations: individual: Arches / radio continuum: stars / stars: massive / stars: mass-loss / radiation mechanisms: thermal
A copy of the cleaned images is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/647/A110
© ESO 2021
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