2021MNRAS.504.4551S

Query : 2021MNRAS.504.4551S

2021MNRAS.504.4551S - Mon. Not. R. Astron. Soc., 504, 4551-4567 (2021/July-1)

Magellanic satellites in ΛCDM cosmological hydrodynamical simulations of the Local Group.

SANTOS-SANTOS I.M.E., FATTAHI A., SALES L.V. and NAVARRO J.F.

Abstract (from CDS):

We use the APOSTLE ΛCDM cosmological hydrodynamical simulations of the Local Group to study the recent accretion of massive satellites into the halo of Milky Way (MW)-sized galaxies. These systems are selected to be close analogues to the Large Magellanic Cloud (LMC), the most massive satellite of the MW. The simulations allow us to address, in a cosmological context, the impact of the Clouds on the MW, including the contribution of Magellanic satellites to the MW satellite population, and the constraints placed on the Galactic potential by the motion of the LMC. We show that LMC-like satellites are twice more common around Local Group-like primaries than around isolated haloes of similar mass; these satellites come from large turnaround radii and are on highly eccentric orbits whose velocities at first pericentre are comparable with the primary's escape velocity. This implies V_ esc_^ MW^ (50 kpc) ∼ 365 km s–1, a strong constraint on Galactic potential models. LMC analogues contribute about two satellites with M*>105 M☉, having thus only a mild impact on the luminous satellite population of their hosts. At first pericentre, LMC-associated satellites are close to the LMC in position and velocity, and are distributed along the LMC's orbital plane. Their orbital angular momenta roughly align with the LMC's, but, interestingly, they may appear to 'counter-rotate' the MW in some cases. These criteria refine earlier estimates of the LMC association of MW satellites: only the SMC, Hydrus1, Car3, Hor1, Tuc4, Ret2, and Phoenix2 are compatible with all criteria. Carina, Grus2, Hor2, and Fornax are less probable associates given their large LMC relative velocity.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: haloes - galaxies: kinematics and dynamics - Local Group - Magellanic Clouds

Simbad objects: 55

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Number of rows : 55
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
6 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
7 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
8 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
9 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
10 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
11 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
12 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
13 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
14 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
15 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 NAME Col I G 05 31.4 -28 02           ~ 60 0
18 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
19 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
20 Cl Pismis 2 OpC 08 17 54.4 -41 40 27           ~ 50 0
21 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
22 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 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 Car II HII Region HII 10 44 47 -59 38.8           ~ 40 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 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 Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
36 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
37 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
38 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
39 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
40 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
41 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
42 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
43 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
44 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
45 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
46 NAME Gru II G 22 04.1 -46 26           ~ 110 0
47 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
48 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
49 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
50 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
51 NAME Grus GrG 23 18 -42.4           ~ 42 0
52 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
53 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
54 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
55 NAME Local Group GrG ~ ~           ~ 9325 0

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