Radio observations of massive stars in the Galactic centre: The Arches Cluster

A. T. Gallego-Calvente*, R. Schödel, A. Alberdi, R. Herrero-Illana, F. Najarro, F. Yusef-Zadeh, H. Dong, J. Sanchez-Bermudez, B. Shahzamanian, F. Nogueras-Lara, E. Gallego-Cano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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.

Original languageEnglish (US)
Article numberA110
JournalAstronomy and Astrophysics
StatePublished - Mar 1 2021


  • Galaxy: center
  • Open clusters and associations: individual: Arches
  • Radiation mechanisms: thermal
  • Radio continuum: stars
  • Stars: mass-loss
  • Stars: massive

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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