2019ApJ...882...98P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:41:26

2019ApJ...882...98P - Astrophys. J., 882, 98-98 (2019/September-2)

Formation imprints in the kinematics of the Milky Way globular cluster system.

PIATTI A.E.

Abstract (from CDS):

We report results on the kinematics of Milky Way (MW) globular clusters (GCs) based on updated space velocities for nearly the entire GC population. We found that a 3D space with the semimajor axis, the eccentricity, and the inclination of the orbit with respect to the MW plane as its axes, is helpful in order to dig into the formation of the GC system. We find that GCs formed in situ show a clear correlation between their eccentricities and their orbital inclination in the sense that clusters with large eccentricities also have large inclinations. These GCs also show a correlation between their distance to the MW center and their eccentricity. Accreted GCs do not exhibit a relationship between eccentricity and inclination, but span a wide variety of inclinations at eccentricities larger than ∼0.5. Finally, we computed the velocity anisotropy β of the GC system and found, for GCs formed in situ, that β decreases from ≃0.8 down to 0.3 from the outermost regions toward the MW center, but remains fairly constant (0.7-0.9) for accreted ones. These findings can be explained if GCs formed from gas that collapsed radially in the outskirts, with a preference for relatively high infall angles. As the material reached the rotating forming disk, it became more circular and moved with a lower inclination relative to the disk. Half of the GC population was accreted and deposited in orbits covering the entire range of energies from the outer halo to the bulge.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: formation - Galaxy: structure - globular clusters: general

CDS comments: Kraken Galaxy is not in SIMBAD.

Simbad objects: 40

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Number of rows : 40

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 931 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 945 0
3 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 433 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1252 0
5 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 722 0
6 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 429 0
7 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 190 1
8 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1254 0
9 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 734 0
10 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 886 0
11 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 354 0
12 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3032 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2277 0
14 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 367 0
15 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 249 0
16 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 312 0
17 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 341 0
18 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1782 0
19 NGC 5946 GlC 15 35 28.58 -50 39 35.0   11.98 10.72     ~ 166 0
20 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1685 0
21 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2016 0
22 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 239 0
23 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1916 0
24 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11766 0
25 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 236 0
26 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 248 0
27 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1779 2
28 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 914 0
29 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1817 0
30 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 364 0
31 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 316 0
32 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 363 0
33 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 368 0
34 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 486 0
35 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2923 0
36 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 906 1
37 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 925 0
38 NAME Gaia Sausage MGr ~ ~           ~ 55 0
39 NAME Gaia-Enceladus G ~ ~           ~ 67 0
40 NAME Galactic Bar reg ~ ~           ~ 919 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-12:41:26

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