J/A+A/647/A110 Arches cluster JVLA 6 and 10GHz images (Gallego-Calvente+, 2021)
Radio observations of massive stars in the Galactic centre: The Arches cluster.
Gallego-Calvente A.T., Schoedel R., Alberdi A., Herrero-Illana R.,
Najarro F., Yusef-Zadeh F., Dong H., Sanchez-Bermudez J., Shahzamanian B.,
Nogueras-Lara F., Gallego-Cano E.
<Astron. Astrophys. 647, A110 (2021)>
=2021A&A...647A.110G 2021A&A...647A.110G (SIMBAD/NED BibCode)
ADC_Keywords: Galactic center ; Clusters, open ; Radio sources
Keywords: Galaxy: centre - open clusters and associations: individual: Arches -
radio continuum: stars - stars: massive - stars: mass-loss -
radiation mechanisms: thermal
Abstract:
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 (JVLA). The rms noise
reached is 3-4 times better than 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 wind colliding binary and
two sources are ambiguous cases. Regarding variability, the radio
emission appears to be stable on time scales of a few to ten years.
Finally, we have showed that the number of radio stars can be used as
a tool for constraining the age or mass of a cluster and also its mass
function.
Description:
2016 X-band and 2018 C-band images of the Arches cluster not corrected
for primary beam attenuation.
Objects:
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RA (2000) DE Designation(s)
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17 45 50.49 -28 49 19.92 Arches cluster = NAME Arches Cluster
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 164 2 List of fits images
fits/* . 2 Individual fits images
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See also:
J/ApJ/581/258 : Infrared photometry in the Arches Cluster (Figer+, 2002)
J/A+A/617/A65 : Stellar population of the Arches cluster (Clark+, 2018)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 48 A19 "datime" Obs.date Observation date
50- 56 F7.5 GHz Freq Observed frequency
58- 62 I5 Kibyte size Size of FITS file
64- 81 A18 --- FileName Name of FITS file, in subdirectory fits
83-164 A82 --- Title Title of the FITS file
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Acknowledgements:
Aurelia Teresa Gallego Calvente, gallego(at)iaa.es
The research leading to these results acknowledges financial support
from the State Agency for Research of the Spanish MCIU through the
"Center of Excellence Severo Ochoa" award for the Instituto de
Astrofisica de Andalucia (SEV-2017-0709), and she also acknowledges
financial support from national project PGC2018-095049-B-C21
(MCIU/AEI/FEDER, UE).
(End) Patricia Vannier [CDS] 26-Dec-2020