2020MNRAS.495.2554E

Query : 2020MNRAS.495.2554E

2020MNRAS.495.2554E - Mon. Not. R. Astron. Soc., 495, 2554-2563 (2020/July-1)

Limit on the LMC mass from a census of its satellites.

ERKAL D. and BELOKUROV V.A.

Abstract (from CDS):

We study the orbits of dwarf galaxies in the combined presence of the Milky Way and Large Magellanic Cloud (LMC) and find six dwarfs that were likely accreted with the LMC (Car 2, Car 3, Hor 1, Hyi 1, Phe 2, and Ret 2), in addition to the Small Magellanic Cloud (SMC), representing strong evidence of dwarf galaxy group infall. This procedure depends on the gravitational pull of the LMC, allowing us to place a lower bound on the Cloud's mass of M_ LMC_ > 1.24×1011 M☉ if we assume that these are LMC satellites. This mass estimate is validated by applying the technique to a cosmological zoom-in simulation of a Milky Way-like galaxy with an LMC analogue where we find that while this lower bound may be overestimated, it will improve in the future with smaller observational errors. We apply this technique to dwarf galaxies lacking radial velocities and find that Eri 3 has a broad range of radial velocities for which it has a significant chance (>0.4) of having been bound to the Cloud. We study the non-Magellanic classical satellites and find that Fornax has an appreciable probability of being an LMC satellite if the LMC is sufficiently massive (∼2.5×1011 M☉). In addition, we explore how the orbits of Milky Way satellites change in the presence of the LMC and find a significant change for several objects. Finally, we find that the dwarf galaxies likely to be LMC satellites are slightly smaller than Milky Way satellites at a fixed luminosity, possibly due to the different tidal environments they have experienced.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: evolution - Galaxy: kinematics and dynamics - Magellanic Clouds

Simbad objects: 49

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Number of rows : 49
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 Eri III G 02 22 45.480 -52 17 04.92           ~ 79 0
9 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
10 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
11 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
13 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 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 Pic I G 04 43 47.4 -50 16 59           ~ 58 0
18 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
19 NAME Col I G 05 31.4 -28 02           ~ 60 0
20 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
21 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
22 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
23 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
24 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
25 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
26 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
27 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
28 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
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 Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
32 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
33 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
34 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
35 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
36 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
37 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 399 0
38 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
39 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
40 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
41 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
42 NAME Gru II G 22 04.1 -46 26           ~ 110 0
43 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
44 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
45 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
46 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
47 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
48 NAME Bootis 2 GrG ~ ~           ~ 3 0
49 NAME Bootis 1 GrG ~ ~           ~ 3 0

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