2017MNRAS.464.2174B

Query : 2017MNRAS.464.2174B

2017MNRAS.464.2174B - Mon. Not. R. Astron. Soc., 464, 2174-2202 (2017/January-2)

N-body modelling of globular clusters: masses, mass-to-light ratios and intermediate-mass black holes.

BAUMGARDT H.

Abstract (from CDS):

We have determined the masses and mass-to-light ratios of 50 Galactic globular clusters by comparing their velocity dispersion and surface brightness profiles against a large grid of 900 N-body simulations of star clusters of varying initial concentration, size and central black hole mass fraction. Our models follow the evolution of the clusters under the combined effects of stellar evolution and two-body relaxation allowing us to take the effects of mass segregation and energy equipartition between stars self-consistently into account. For a subset of 16 well-observed clusters, we also derive their kinematic distances. We find an average mass-to-light ratio of Galactic globular clusters of <M/LV > =1.98 ± 0.03, which agrees very well with the expected M/L ratio if the initial mass function (IMF) of the clusters was a standard Kroupa or Chabrier mass function. We do not find evidence for a decrease in the average mass-to-light ratio with metallicity. The surface brightness and velocity dispersion profiles of most globular clusters are incompatible with the presence of intermediate-mass black holes (IMBHs) with more than a few thousand M☉ in them. The only clear exception is ω Cen, where the velocity dispersion profile provides strong evidence for the presence of a ∼40 000 M☉ IMBH in the centre of the cluster.

Abstract Copyright: © 2016 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: luminosity function, mass function - globular clusters: general - globular clusters: individual: ω Cen - globular clusters: individual: ω Cen

Simbad objects: 57

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Number of rows : 57
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
5 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
6 ESO 243-49 GiC 01 10 27.7550638752 -46 04 27.356310264 16.54 14.92   13.48   ~ 187 0
7 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
10 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
11 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
12 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
13 POX 52 Sy2 12 02 56.93256 -20 56 02.9580           ~ 178 0
14 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
15 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
16 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
17 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
18 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
19 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
20 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
21 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
22 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
23 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
24 NGC 5694 GlC 14 39 36.52 -26 32 18.0           ~ 323 0
25 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
26 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
27 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 499 0
28 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
29 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
30 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
31 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 231 0
32 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
33 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
34 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
35 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
36 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
37 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
38 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
39 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
40 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
41 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 420 0
42 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
43 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
44 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 320 0
45 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
46 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
47 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
48 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
49 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
50 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
51 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
52 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
53 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
54 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
55 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
56 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
57 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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