2024A&A...681A..24S

Query : 2024A&A...681A..24S

2024A&A...681A..24S - Astronomy and Astrophysics, volume 681A24 (2024/1-1)

A robust automated machine-learning method for the identification of star clusters in the central region of the Small Magellanic Cloud.

STRANTZALIS A., LAZAROU D., HATZIDIMITRIOU D., ZEZAS A., ANTONIOU V. and RESKOS N.

Abstract (from CDS):

Aims. We developed a cluster-detection method based on the code DBSCAN to identify star clusters in the central region of the Small Magellanic Cloud (SMC).
Methods. Two approaches were used to determine the values of the free parameters of DBSCAN. They agree well with each other and can be used in the fields that are studied without any a priori knowledge of clustering, characteristic scales, or background density. We validated the success of the DBSCAN cluster-detection method on recent cluster catalogues after introducing a cluster-classification scheme based on three diagnostics that relie on colour-magnitude diagrams and growth curves. We used data from the Magellan Telescope at the Las Campanas Observatory in Chile and from Gaia Data Release 3.
Results. As a byproduct of the validation process, we revisited objects that were classified as clusters in recent compilations. We found that 40% fail all diagnostics and most probably are not clusters. DBSCAN was very successful in recovering actual clusters with high precision and recall.

Abstract Copyright: © The Authors 2023

Journal keyword(s): Magellanic Clouds - galaxies: star clusters: general - methods: statistical

Simbad objects: 91

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Number of rows : 91
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-CL SMC 1 Cl* 00 36 38.34 -73 05 09.2           ~ 8 0
2 [H86] 36 As* 00 36 50 -73 04.3           ~ 8 0
3 OGLE-CL SMC 187 Cl* 00 47 05.87 -73 22 16.6           ~ 14 0
4 OGLE-CL SMC 38 Cl* 00 47 06.15 -73 15 24.9           ~ 13 0
5 [MA93] 172 HXB 00 47 23.3388222768 -73 12 27.370134648   15.85 15.85   15.872 B1-B1.5V 58 0
6 [H86] 91 Cl* 00 47 31 -73 26.1           ~ 5 0
7 [H86] 92 Cl* 00 47 34 -73 19.9           ~ 6 0
8 OGLE-CL SMC 43 Cl* 00 47 53.42 -73 13 14.1 13.74 13.18 12.71   12.19 ~ 24 0
9 [BS95] 38 Cl* 00 48 22 -73 19.6           ~ 5 0
10 [MA93] 222 Em* 00 48 22.76 -73 05 59.3     15.7     ~ 6 0
11 Bruck 47 Cl* 00 48 33.23 -73 18 25.1           ~ 16 0
12 OGLE-CL SMC 193 As* 00 48 36.55 -73 10 45.2           ~ 9 0
13 Bruck 48 As* 00 48 37.47 -73 24 53.2           ~ 17 0
14 Bruck 50 Cl* 00 49 02.0 -73 21 44           ~ 10 0
15 OGLE-CL SMC 52 Cl* 00 49 12.21 -73 06 30.7           ~ 10 0
16 [BS95] 43 As* 00 49 15 -73 22.3           ~ 7 0
17 Cl Lindsay 39 Cl* 00 49 16.16 -73 22 18.6 12.93 12.84 12.53   12.30 ~ 30 0
18 OGLE-CL SMC 195 As* 00 49 16.45 -73 14 56.8           ~ 13 0
19 OGLE-CL SMC 53 Cl* 00 49 17.52 -73 12 41.8           ~ 12 1
20 OGLE-CL SMC 55 Cl* 00 49 21.30 -73 11 01.7           ~ 7 0
21 OGLE-CL SMC 196 Cl* 00 49 26.81 -73 23 55.2           ~ 10 0
22 OGLE-CL SMC 61 As* 00 50 00.26 -73 15 17.7           ~ 12 0
23 Bruck 53 Cl* 00 50 03.82 -73 23 03.9           ~ 14 0
24 OGLE-CL SMC 198 Cl* 00 50 07.51 -73 11 25.9           ~ 12 0
25 [BS95] 39 Cl* 00 50 12 -73 20.8           ~ 6 0
26 [MA93] 351 Em* 00 50 18.77 -73 19 29.6     16.5     ~ 6 0
27 Bruck 55 Cl* 00 50 20.54 -73 23 12.1 13.93 14.10 13.90   13.60 ~ 17 0
28 Bruck 54 Cl* 00 50 27.83 -73 12 24.9 15.11 15.20 15.07   15.26 ~ 14 0
29 [H86] 114 Cl* 00 50 34.83 -72 39 02.0 14.22 14.44 14.08   13.73 ~ 10 0
30 [H86] 106 Cl* 00 50 37 -73 20.2           ~ 4 0
31 OGLE-CL SMC 201 As* 00 50 42.49 -73 23 49.0           ~ 9 0
32 [H86] 108 Cl* 00 50 53 -73 24.4           ~ 7 0
33 LI-SMC 74 Cl* 00 50 55.15 -72 43 37.5 12.28 12.55 11.87   10.25 ~ 22 0
34 Bruck 56 Cl* 00 50 55.39 -73 12 11.0           ~ 14 0
35 [H86] 118 Cl* 00 51 03.6 -72 30 42           ~ 1 0
36 NGC 290 Cl* 00 51 12.33 -73 09 42.1 11.91 12.10 11.71   11.09 ~ 39 0
37 OGLE-CL SMC 204 Cl* 00 51 21.33 -73 08 18.7           ~ 11 0
38 OGLE-CL SMC 70 As* 00 51 26.15 -73 16 59.8           ~ 10 0
39 [H86] 119 Cl* 00 51 37 -72 32.5           ~ 8 0
40 OGLE-CL SMC 73 Cl* 00 51 44.13 -72 50 23.3 13.41 13.63 13.25   12.67 ~ 15 0
41 OGLE-CL SMC 206 Cl* 00 51 44.34 -73 10 01.3           ~ 9 0
42 OGLE-CL SMC 207 Cl* 00 51 48.80 -72 32 27.6           ~ 9 0
43 LHA 115-N 45 Cl* 00 52 01.7 -73 13 19   14.24       ~ 31 0
44 [H86] 131 Cl* 00 52 02.76 -72 49 03.9           ~ 8 0
45 [BS95] 54 As* 00 52 09 -73 18.9           ~ 5 0
46 OGLE-CL SMC 76 Cl* 00 52 12.47 -72 31 51.2           ~ 12 0
47 OGLE-CL SMC 209 As* 00 52 15.25 -72 45 58.1           ~ 8 0
48 OGLE-CL SMC 80 Cl* 00 52 31.46 -72 37 46.5           ~ 8 0
49 [H86] 137 Cl* 00 52 33.61 -72 40 45.2 14.56 14.76 14.37   13.77 ~ 15 0
50 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
51 OGLE-CL SMC 86 Cl* 00 52 49.02 -72 30 40.5 14.34 14.49 14.17   14.29 ~ 11 0
52 Bruck 66 Cl* 00 52 50.86 -72 47 48.2 14.90 15.29 14.94   14.27 ~ 14 0
53 [BS95] 254 Cl* 00 52 51 -72 44.1           ~ 7 0
54 Bruck 69 Cl* 00 53 04.81 -72 37 25.8 12.71 13.51 13.44   13.48 ~ 15 0
55 [H86] 136 Cl* 00 53 08 -72 20.2           ~ 4 0
56 OGLE-CL SMC 214 Cl* 00 53 08.54 -72 49 57.7           ~ 9 0
57 OGLE-CL SMC 91 Cl* 00 53 09.45 -72 34 25.7 16.16 16.25 15.74   15.21 ~ 14 0
58 [H86] 139 Cl* 00 53 11 -72 50.1           ~ 5 0
59 OGLE-CL SMC 215 Cl* 00 53 16.84 -72 44 02.8           ~ 8 0
60 Bruck 71 Cl* 00 53 19.42 -72 46 00.9 12.23 12.78 11.91   10.67 ~ 17 0
61 OGLE-CL SMC 93 Cl* 00 53 31.29 -72 40 04.2           ~ 11 0
62 [H86] 145 Cl* 00 53 37 -72 21.0           ~ 10 0
63 [H86] 142 Cl* 00 53 39 -72 29.1           ~ 7 0
64 [H86] 146 As* 00 53 43 -72 23.3           ~ 9 0
65 OGLE-CL SMC 216 Cl* 00 53 50.13 -72 53 47.0           ~ 13 0
66 [H86] 148 Cl* 00 53 55 -72 40.1           ~ 8 0
67 OGLE-CL SMC 217 As* 00 53 56.49 -72 51 23.8           ~ 10 0
68 OGLE-CL SMC 97 As* 00 54 11.00 -72 51 54.1           ~ 11 0
69 NGC 306 Cl* 00 54 14.31 -72 14 27.3 12.08 12.23 12.07   11.40 ~ 33 0
70 [H86] 149 Cl* 00 54 19 -72 30.9           ~ 8 0
71 Bruck 79 Cl* 00 54 48.50 -72 27 53.6 12.76 12.99 12.85   12.55 ~ 23 0
72 [BS95] 259 Cl* 00 54 55 -72 26.5           ~ 7 0
73 [H86] 161 Cl* 00 55 08.54 -72 48 40.1           ~ 8 0
74 OGLE-CL SMC 102 Cl* 00 55 12.04 -72 41 00.0           ~ 14 1
75 OGLE-CL SMC 220 As* 00 55 14.05 -72 36 03.8           ~ 8 0
76 [H86] 160 Cl* 00 55 21 -72 40.2           ~ 5 0
77 [H86] 166 As* 00 56 01 -72 21.8           ~ 6 0
78 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
79 [H86] 170 Cl* 00 56 20 -72 21.2           ~ 8 0
80 [H86] 171 Cl* 00 56 39 -72 13.0           ~ 5 0
81 LHA 115-S 26 Cl* 00 57 30.00 -72 15 53.0 11.29       11.34 ~ 42 1
82 OGLE-CL SMC 227 Cl* 00 57 50.23 -72 26 23.6           ~ 13 0
83 Bruck 90 Cl* 00 57 55 -72 17.5           ~ 7 0
84 OGLE-CL SMC 112 Cl* 00 57 57.14 -72 26 42.0           ~ 12 0
85 [BS95] 269 As* 00 58 19 -72 13.2           ~ 8 0
86 OGLE-CL SMC 228 Cl* 00 58 19.42 -72 17 56.6           ~ 12 0
87 [BS95] 270 As* 00 58 23 -72 12.7           ~ 8 0
88 OGLE-CL SMC 115 Cl* 00 58 33.64 -72 16 51.6           ~ 12 0
89 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
90 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
91 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0

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