2020MNRAS.492.3859D

Query : 2020MNRAS.492.3859D

2020MNRAS.492.3859D - Mon. Not. R. Astron. Soc., 492, 3859-3871 (2020/March-1)

The WAGGS project-III. Discrepant mass-to-light ratios of Galactic globular clusters at high metallicity.

DALGLEISH H., KAMANN S., USHER C., BAUMGARDT H., BASTIAN N., VEITCH-MICHAELIS J., BELLINI A., MARTOCCHIA S., DA COSTA G.S., MACKEY D., BELLSTEDT S., PASTORELLO N. and CERULO P.

Abstract (from CDS):

Observed mass-to-light ratios (M/L) of metal-rich globular clusters (GCs) disagree with theoretical predictions. This discrepancy is of fundamental importance since stellar population models provide the stellar masses that underpin most of extragalactic astronomy, near and far. We have derived radial velocities for 1622 stars located in the centres of 59 Milky Way GCs - 12 of which have no previous kinematic information - using integral-field unit data from the WAGGS project. Using N-body models, we determine dynamical masses and M/LV for the studied clusters. Our sample includes NGC 6528 and NGC 6553, which extend the metallicity range of GCs with measured M/L up to [Fe/H] ∼ -0.1 dex. We find that metal-rich clusters have M/LV more than two times lower than what is predicted by simple stellar population models. This confirms that the discrepant M/L-[Fe/H] relation remains a serious concern. We explore how our findings relate to previous observations, and the potential causes for the divergence, which we conclude is most likely due to dynamical effects.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: kinematics and dynamics

Simbad objects: 62

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Number of rows : 62
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     ~ 3919 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12666 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11168 1
4 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1045 0
5 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1087 0
6 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 521 0
7 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1431 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17462 0
9 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 498 0
10 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1421 0
11 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 887 0
12 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 998 0
13 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 426 0
14 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 838 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2480 0
16 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 444 0
17 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1981 0
18 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 463 0
19 NGC 5946 GlC 15 35 28.58 -50 39 35.0           ~ 195 0
20 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 375 0
21 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1854 0
22 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 787 0
23 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 680 0
24 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 790 0
25 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 360 0
26 NGC 6325 GlC 17 17 59.27 -23 45 57.7           ~ 172 0
27 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 318 0
28 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 287 0
29 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 351 1
30 NGC 6355 GlC 17 23 58.65 -26 21 12.3   12.46 11.05     ~ 156 0
31 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 397 0
32 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 587 0
33 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 141 0
34 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 916 1
35 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1978 0
36 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 886 0
37 NGC 6453 GlC 17 50 51.77 -34 35 55.1   10.49       ~ 167 0
38 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 226 0
39 NGC 6517 GlC 18 01 50.376 -08 57 34.39   11.08       ~ 183 0
40 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 525 0
41 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 379 0
42 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 602 0
43 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 289 0
44 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 887 1
45 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 463 0
46 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 208 0
47 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 441 0
48 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1380 0
49 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 387 0
50 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1070 0
51 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 245 0
52 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 502 0
53 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2002 0
54 NGC 6760 GlC 19 11 12.06 +01 01 49.7   11.37 9.78     ~ 241 0
55 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 856 0
56 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1129 0
57 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 423 0
58 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 431 0
59 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 533 0
60 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3141 0
61 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1031 1
62 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1050 0

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