2019MNRAS.489..623V

Query : 2019MNRAS.489..623V

2019MNRAS.489..623V - Mon. Not. R. Astron. Soc., 489, 623-640 (2019/October-2)

Systematic errors in Gaia DR2 astrometry and their impact on measurements of internal kinematics of star clusters.

VASILIEV E.

Abstract (from CDS):

We use stellar proper motions (PM) from Gaia Data Release 2 for studying the internal kinematics of Milky Way globular clusters. In addition to statistical measurement errors, there are significant spatially correlated systematic errors, which cannot be ignored when studying the internal kinematics. We develop a mathematically consistent procedure for incorporating the spatial correlations in any model-fitting approach, and use it to determine rotation and velocity dispersion profiles of a few dozen clusters. We confirm detection of rotation in the sky plane for ∼10 clusters reported in previous studies, and discover a few more clusters with rotation amplitudes exceeding ∼0.05 mas yr–1. However, in more than half of these cases the significance of this rotation signature is rather low when taking into account the systematic errors. We find that the PM dispersion is not sensitive to systematic errors in PM, however, it is quite sensitive to the selection criteria on the input sample, most importantly, in crowded central regions. When using the cleanest possible samples, PM dispersion can be reliably measured down to 0.1 mas yr–1 for ∼60 clusters.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): proper motions - globular clusters: general

Simbad objects: 63

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Number of rows : 63
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3917 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1042 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1085 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1430 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1420 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 885 0
9 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 303 0
10 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 997 0
11 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 425 0
12 NGC 5039 G 13 14 44.4 -04 13 34   16.98   17.783   ~ 3 0
13 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
14 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2479 0
15 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 443 0
16 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1978 0
17 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 462 0
18 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 374 0
19 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 716 0
20 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1850 0
21 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 214 0
22 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 786 0
23 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2193 0
24 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 677 0
25 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 789 0
26 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 620 0
27 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 369 1
28 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 281 0
29 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 359 0
30 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2116 0
31 NGC 6325 GlC 17 17 59.27 -23 45 57.7           ~ 171 0
32 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 317 0
33 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 396 0
34 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 312 0
35 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 585 0
36 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 914 1
37 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 386 0
38 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1976 0
39 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 884 0
40 NGC 6517 GlC 18 01 50.376 -08 57 34.39   11.08       ~ 182 0
41 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 294 0
42 NGC 6539 GlC 18 04 49.74 -07 35 09.1           ~ 225 0
43 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 296 0
44 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 377 0
45 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 601 0
46 IC 1276 GlC 18 10 44.26 -07 12 27.3           ~ 121 0
47 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 238 0
48 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 886 1
49 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 770 0
50 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1379 0
51 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 386 0
52 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 519 0
53 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1069 0
54 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 500 0
55 NGC 6749 OpC 19 05 15.36 +01 54 00.0     12.4     ~ 157 0
56 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2001 0
57 NGC 6760 GlC 19 11 12.06 +01 01 49.7   11.37 9.78     ~ 240 0
58 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 422 0
59 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 854 0
60 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1128 0
61 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3140 0
62 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1030 1
63 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1049 0

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