2022A&A...657A..54B

Query : 2022A&A...657A..54B

2022A&A...657A..54B - Astronomy and Astrophysics, volume 657A, 54-54 (2022/1-1)

Gaia early DR3 systemic motions of Local Group dwarf galaxies and orbital properties with a massive Large Magellanic Cloud.

BATTAGLIA G., TAIBI S., THOMAS G.F. and FRITZ T.K.

Abstract (from CDS):


Aims. We perform a comprehensive determination of the systemic proper motions of 74 dwarf galaxies and dwarf galaxy candidates in the Local Group based on Gaia early data release 3. The outputs of the analysis for each galaxy, including probabilities of membership, will be made publicly available. The analysis is augmented by a determination of the orbital properties of galaxies within 500 kpc.
Methods. We adopt a flexible Bayesian methodology presented in the literature, which takes into account the location of the stars on the sky, on the colour-magnitude diagram, and on the proper motion plane. We applied some modifications, in particular to the way the colour-magnitude diagram and spectroscopic information are factored in, for example, by including stars in several evolution phases. The bulk motions were integrated in three gravitational potentials: two where the Milky Way was treated in isolation and has a mass 0.9 & 1.6 x 1012 M☉, and a time-varying potential, which includes the infall of a massive Large Magellanic Cloud (LMC).
Results. We were able to determine bulk proper motions for 73 systems, and we consider 66 to be reliable measurements. For the first time, systemic motions are presented for galaxies out to a distance of 1.4 Mpc in the NGC 3109 association. The inclusion of the infall of a massive LMC significantly modifies the orbital trajectories of the objects, with respect to orbit integration in static Milky-Way-only potentials, and this leads to six galaxies likely being associated with the LMC, three possibly being associated with it, and one recently captured object. We discuss the results of the orbit integration in the context of the relation of the galaxies to the system of Milky Way satellites, implications for the too-big-to-fail problem, the impact on star formation histories, and tidal disruption.

Abstract Copyright: © ESO 2022

Journal keyword(s): methods: statistical - astrometry - galaxies: dwarf - galaxies: evolution - galaxies: kinematics and dynamics - Local Group

VizieR on-line data: <Available at CDS (J/A+A/657/A54): pmem.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 87

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Number of rows : 87
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Wolf-Lundmark-Melotte G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 691 2
2 NAME Tuc IV G 00 02.9 -60 51           ~ 69 0
3 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1119 1
4 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
5 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 800 1
6 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1308 1
7 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12650 1
8 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
9 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1359 4
10 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 387 0
11 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1236 2
12 NAME Cetus II G 01 17.9 -17 25           ~ 43 0
13 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
14 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 533 2
15 NAME DELVE 2 Cl* 01 55 05 -68 15.0           ~ 14 0
16 NAME Cetus III Dwarf Galaxy G? 02 05 19.40 -04 16 12.0           ~ 24 0
17 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 130 0
18 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 262 0
19 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 63 0
20 [LPS2017] DES J0225+0304 G? 02 25 42.40 +03 04 10.1           ~ 20 0
21 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 56 0
22 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1743 1
23 NAME Hor I G 02 55 31.7 -54 07 08           ~ 141 0
24 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
25 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 62 0
26 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 309 0
27 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 174 0
28 NAME Reticulum III G 03 45.4 -60 27           ~ 55 0
29 NAME Pic I G 04 43 47.4 -50 16 59           ~ 51 0
30 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
31 NAME Col I G 05 31.4 -28 02           ~ 50 0
32 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1125 0
33 NAME Pic II G 06 44 43 -59 53.8           ~ 27 0
34 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 66 0
35 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 62 0
36 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 374 0
37 UGC 4879 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 127 0
38 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 391 0
39 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 77 0
40 NAME Leo A G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 615 0
41 NAME Sextans B H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 528 0
42 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 769 2
43 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 465 1
44 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1208 1
45 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 727 2
46 NAME Sextans dSph G 10 13 02.9 -01 36 53   12 10.4     ~ 854 0
47 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 328 1
48 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 320 0
49 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 840 0
50 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 203 0
51 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 383 1
52 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 91 1
53 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 137 0
54 NAME Virgo I Dwarf Galaxy G 12 00 09.6 -00 40 48           ~ 30 0
55 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 97 0
56 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 452 1
57 NAME Centaurus I G 12 38 20 -40 54.1           ~ 18 0
58 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 232 0
59 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 263 2
60 NAME Styx Stream St* 13 56 24.0 +26 48 00           ~ 27 0
61 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 96 1
62 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 241 0
63 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 437 0
64 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1360 0
65 NAME Bootes IV G 15 34 45 +43 43.6           ~ 18 0
66 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 107 0
67 NAME DELVE 1 Cl* 16 30 54 -00 58.3           ~ 10 0
68 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 345 1
69 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1331 1
70 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
71 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 307 1
72 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
73 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 74 0
74 NAME Ind II G 20 38.9 -46 10           ~ 27 0
75 NAME Indus I Cl* 21 08 49.970 -51 09 48.60           ~ 58 0
76 NAME Gru II G 22 04.1 -46 26           ~ 85 0
77 NAME Pegasus III G 22 24 22.6 +05 25 12           ~ 55 0
78 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 52 0
79 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 155 0
80 NAME Grus I G 22 56 42.4 -50 09 48           ~ 102 0
81 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 258 0
82 NAME PegDIG G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 474 1
83 NAME Tuc V G 23 37.4 -63 16           ~ 60 0
84 NAME Phe II G 23 39 59.4 -54 24 22           ~ 86 0
85 NAME Tuc III G 23 56.6 -59 36           ~ 189 0
86 NAME Local Group GrG ~ ~           ~ 8391 0
87 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 522 0

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