TY - JOUR
T1 - Radio observations of massive stars in the Galactic centre
T2 - The Arches Cluster
AU - Gallego-Calvente, A. T.
AU - Schödel, R.
AU - Alberdi, A.
AU - Herrero-Illana, R.
AU - Najarro, F.
AU - Yusef-Zadeh, F.
AU - Dong, H.
AU - Sanchez-Bermudez, J.
AU - Shahzamanian, B.
AU - Nogueras-Lara, F.
AU - Gallego-Cano, E.
N1 - Funding Information:
Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation (NSF) operated under cooperative agreement by Associated Universities, Inc. A.T.G.-C., R.S., A.A. and B.S. acknowledge financial support from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award for the Instituto de Astrofísica de Andalucía (SEV-2017-0709). A.T.G.-C., R.S., and B.S. acknowledge financial support from national project PGC2018-095049-B-C21 (MCIU/AEI/FEDER, UE). A.A. acknowledges support from national project PGC2018-098915-B-C21 (MCIU/AEI/FEDER, UE). F.N. acknowledges financial support through Spanish grants ESP2017-86582-C4-1-R and PID2019-105552RB-C41 (MINECO/MCIU/AEI/FEDER) and from the Spanish State Research Agency (AEI) through the Unidad de Excelencia “María de Maeztu”-Centro de Astrobiología (CSIC-INTA) project No. MDM-2017-0737. F.N.-L. gratefully acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 138713538 – SFB 881 (“The Milky Way System”, subproject B8). The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement n◦ [614922].
Publisher Copyright:
© ESO 2021.
PY - 2021/3/1
Y1 - 2021/3/1
N2 - 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.
AB - 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.
KW - Galaxy: center
KW - Open clusters and associations: individual: Arches
KW - Radiation mechanisms: thermal
KW - Radio continuum: stars
KW - Stars: mass-loss
KW - Stars: massive
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U2 - 10.1051/0004-6361/202039172
DO - 10.1051/0004-6361/202039172
M3 - Article
AN - SCOPUS:85102900779
SN - 0004-6361
VL - 647
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A110
ER -