2018ApJ...862...52S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:58:21

2018ApJ...862...52S - Astrophys. J., 862, 52-52 (2018/July-3)

Absolute Hubble Space Telescope proper motion (HSTPROMO) of distant Milky Way globular clusters: Galactocentric Space velocities and the Milky Way mass.

SOHN S.T., WATKINS L.L., FARDAL M.A., VAN DER MAREL R.P., DEASON A.J., BESLA G. and BELLINI A.

Abstract (from CDS):

We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular clusters (GCs) in the Milky Way (MW) halo at Galactocentric distances RGC~10–100 kpc, with a median per-coordinate PM uncertainty of 0.06 masyr–1. Young and old halo GCs do not show systematic differences in their 3D Galactocentric velocities, derived from combining existing line-of-sight velocities. We confirm the association of Arp 2, Pal 12, Terzan 7, and Terzan 8 with Sgr. These clusters and NGC 6101 have tangential velocity vtan> 290 km s–1, whereas all other clusters have vtan < 200 km s–1. NGC 2419, the most distant GC in our sample, is also likely associated with the Sgr stream, whereas NGC 4147, NGC 5024, and NGC 5053 definitely are not. We use the distribution of orbital parameters derived using the 3D velocities to separate halo GCs that either formed within the MW or were accreted. We also assess the specific formation history of, e.g., Pyxis and Terzan 8. We constrain the MW mass via an estimator that considers the full 6D phase-space information for 16 of the GCs from RGC=10 to 40 kpc. The velocity dispersion anisotropy parameter β=0.609–0.229+0.130. The enclosed mass M(< 39.5kpc)=0.61–0.12+0.18×1012M, and the virial mass Mvir=2.05–0.79+0.97×1012M. These are consistent with, but on the high side among, recent mass estimates in the literature.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - Galaxy: halo - Galaxy: kinematics and dynamics - globular clusters: general - proper motions

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3637 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11310 1
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 975 0
4 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 114 0
5 NAME Sgr Stream St* 02 22 +00.0           ~ 697 0
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5935 1
7 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 445 0
8 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 444 0
9 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 144 0
10 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 844 0
11 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 86 0
12 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1086 1
13 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 511 0
14 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 332 0
15 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 742 0
16 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 554 0
17 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3104 0
18 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 749 0
19 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 260 0
20 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 320 0
21 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 252 0
22 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 171 1
23 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 194 0
24 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12183 0
25 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 344 0
26 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1836 2
27 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 943 0
28 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 377 0
29 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 314 0
30 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 272 0
31 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 374 0
32 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 493 0
33 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 465 0
34 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 241 1
35 NAME Local Group GrG ~ ~           ~ 7264 0
36 NAME Monoceros Stream St* ~ ~           ~ 328 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-03:58:21

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