2021ApJ...916....8L

Query : 2021ApJ...916....8L

2021ApJ...916....8L - Astrophys. J., 916, 8-8 (2021/July-3)

Gaia EDR3 proper motions of Milky Way dwarfs. I. 3D motions and orbits.

LI H., HAMMER F., BABUSIAUX C., PAWLOWSKI M.S., YANG Y., ARENOU F., DU C. and WANG J.

Abstract (from CDS):

Based on Gaia Early Data Release 3 (EDR3), we estimate the proper motions of 46 dwarf galaxies of the Milky Way (MW). The uncertainties in proper motions, determined by combining both statistical and systematic errors, are smaller by a factor of 2.5 when compared with Gaia Data Release 2. We have derived orbits in four MW potential models that are consistent with the MW rotation curve, with total mass ranging from 2.8 x 1011 M☉ to 15 x 1011 M☉. Although the type of orbit (ellipse or hyperbola) are very dependent on the potential model, the pericenter values are firmly determined, largely independent of the adopted MW mass model. By analyzing the orbital phases, we found that the dwarf galaxies are highly concentrated close to their pericenter, rather than to their apocenter as expected from Kepler's law. This may challenge the fact that most dwarf galaxies are MW satellites, or alternatively indicates an unexpectedly large number of undiscovered dwarf galaxies lying very close to their apocenters. Between half and two-thirds of the satellites have orbital poles that indicate them to orbit along the vast polar structure, with the vast majority of these co-orbiting in a common direction also shared by the Magellanic Clouds, which is indicative of a real structure of dwarf galaxies.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf galaxies - Galaxy kinematics - Galaxy dynamics

Simbad objects: 56

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Number of rows : 56
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 Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
11 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
12 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
13 NAME For I GrG 03 29 35.7 -36 11 36           ~ 23 0
14 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
15 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
16 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
18 NAME Col I G 05 31.4 -28 02           ~ 60 0
19 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
20 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
21 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
22 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
23 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
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 Carina I HII Region HII 10 43 32 -59 35.0           ~ 59 0
29 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
30 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
31 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
32 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
33 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
34 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
35 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
36 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
37 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
38 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
39 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
40 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
41 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
42 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
43 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
44 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
45 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
46 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
47 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
48 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
49 NAME Gru II G 22 04.1 -46 26           ~ 110 0
50 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
51 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
52 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
53 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
54 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
55 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
56 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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