2021A&A...647A.110G

Query : 2021A&A...647A.110G

2021A&A...647A.110G - Astronomy and Astrophysics, volume 647A, 110-110 (2021/3-1)

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

GALLEGO-CALVENTE A.T., SCHODEL R., ALBERDI A., HERRERO-ILLANA R., NAJARRO F., YUSEF-ZADEH F., DONG H., SANCHEZ-BERMUDEZ J., SHAHZAMANIAN B., NOGUERAS-LARA F. and GALLEGO-CANO E.

Abstract (from CDS):

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 10GHz 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.

Abstract Copyright: © ESO 2021

Journal keyword(s): Galaxy: center - open clusters and associations: individual: Arches - radio continuum: stars - stars: massive - stars: mass-loss - radiation mechanisms: thermal

VizieR on-line data: <Available at CDS (J/A+A/647/A110): list.dat fits/*>

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 356 0
2 NGC 3603 OpC 11 15 10.8 -61 15 32           ~ 1067 1
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
4 Cl Westerlund 1 Cl* 16 47 02.4 -45 51 07           ~ 566 0
5 QSO J1744-3116 Bla 17 44 23.57824 -31 16 36.2943           ~ 158 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14414 0
7 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4389 3
8 NAME Arched Filaments PoC 17 45 46.9 -28 50 39           ~ 52 1
9 WR 102a WR* 17 45 48.57 -28 50 05.7           WN8 16 0
10 [MCD2010] 11 WR* 17 45 48.61 -28 49 42.2           WN8-9h 7 0
11 WR 102aa WR* 17 45 49.71 -28 49 25.4           WN8-9 27 0
12 [FNG2002] 19 Rad 17 45 49.82 -28 49 26.5           ~ 9 0
13 WR 102ad WR* 17 45 50.22 -28 49 21.9           WN8-9 25 0
14 WR 102ae WR* 17 45 50.28 -28 49 11.4           WN9h 36 0
15 WR 102af WR* 17 45 50.290 -28 49 17.20           WN7-8 18 0
16 WR 102ag WR* 17 45 50.40 -28 49 20.9           WN8-9 22 0
17 WR 102ah WR* 17 45 50.43 -28 49 21.9           WN8-9h 32 0
18 WR 102ai WR* 17 45 50.47 -28 49 31.5           WN8-9 18 0
19 WR 102aj WR* 17 45 50.48 -28 49 19.2           WN8-9h 27 0
20 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 737 0
21 [BSP2001] 20 Em* 17 45 50.53 -28 49 18.4           O4-6I 12 0
22 WR 102ak WR* 17 45 50.54 -28 49 20.3           WN8-9 17 0
23 WR 102al WR* 17 45 50.58 -28 49 17.2           WN7-8 25 0
24 [BSP2001] 18 Em* 17 45 50.61 -28 49 24.0           O4-6I 9 0
25 WR 102ba WR* 17 45 50.69 -28 49 22.2           WN8-9 17 0
26 WR 102bb WR* 17 45 50.84 -28 49 26.0           WN8-9 20 0
27 WR 102bc WR* 17 45 51.48 -28 49 25.4           WN8 17 0
28 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 525 0
29 NAME Central parsec Cluster Cl* ~ ~           ~ 8 0

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