2024MNRAS.527.2718H

Query : 2024MNRAS.527.2718H

2024MNRAS.527.2718H - Mon. Not. R. Astron. Soc., 527, 2718-2733 (2024/January-2)

The accretion history of the Milky Way - II. Internal kinematics of globular clusters and of dwarf galaxies.

HAMMER F., WANG J., MAMON G.A., PAWLOWSKI M.S., YANG Y., JIAO Y., LI H., BONIFACIO P., CAFFAU E. and WANG H.

Abstract (from CDS):

We study how structural properties of globular clusters and dwarf galaxies are linked to their orbits in the Milky Way halo. From the inner to the outer halo, orbital energy increases and stellar-systems gradually move out of internal equilibrium: in the inner halo, high-surface brightness globular clusters are at pseudo-equilibrium, while further away, low-surface brightness clusters and dwarfs appear more tidally disturbed. Dwarf galaxies are the latest to arrive into the halo as indicated by their large orbital energies and pericentres, and have no time for more than one orbit. Their (gas-rich) progenitors likely lost their gas during their recent arrival in the Galactic halo. If dwarfs are at equilibrium with their dark matter (DM) content, the DM density should anticorrelate with pericentre. However, the transformation of DM dominated dwarfs from gas-rich rotation-supported into gas-poor dispersion-supported systems is unlikely accomplished during a single orbit. We suggest instead that the above anticorrelation is brought by the combination of ram-pressure stripping and of Galactic tidal shocks. Recent gas removal leads to an expansion of their stellar content caused by the associated gravity loss, making them sufficiently fragile to be transformed near pericentre passage. Out of equilibrium dwarfs would explain the observed anticorrelation of kinematics-based DM density with pericentre without invoking DM density itself, questioning its previous estimates. Ram-pressure stripping and tidal shocks may contribute to the dwarf velocity dispersion excess. It predicts the presence of numerous stars in their outskirts and a few young stars in their cores.

Abstract Copyright: © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): Galaxy: halo - globular clusters: general - galaxies: dwarf - Galaxy: evolution - galaxies: interactions

Simbad objects: 64

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Number of rows : 64
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 NAME Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
5 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
6 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
7 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
8 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
9 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
10 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
11 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
12 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
13 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
14 NAME Eridanus Star Cluster GlC 04 24 44.5 -21 11 13           ~ 192 1
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 NAME Col I G 05 31.4 -28 02           ~ 60 0
17 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
18 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
19 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
20 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
21 NAME Pyxis Cluster GlC 09 07 57.80 -37 13 17.0           ~ 123 0
22 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
23 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
24 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
25 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
26 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
27 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
28 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
29 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
30 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
31 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
32 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
33 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
34 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
35 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
36 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
37 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
38 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
39 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
40 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
41 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
42 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 399 0
43 PN K 1-3 PN 16 23 19.0090687824 -31 44 58.628625180   18.6 20.00     ~ 55 0
44 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
45 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 224 1
46 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
47 ESO 280-6 GlC 18 09 06.000 -46 25 24.00           ~ 74 0
48 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
49 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
50 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
51 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
52 NAME Pegasus IV G 21 54 09 +26 37.2           ~ 15 0
53 NAME Gru II G 22 04.1 -46 26           ~ 110 0
54 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
55 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
56 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
57 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
58 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 307 1
59 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
60 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
61 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
62 NAME Coma Berenices Moving Group MGr ~ ~           ~ 103 0
63 NAME Pontus Stream St* ~ ~           ~ 21 0
64 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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