Table 1
Initial MW and GSE components and orbital configurations.
| Merger Model | Components | MW | GSE | GSE initial 6D coordinates | Orbital angles | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | a | h | M | a | h | x | y | z | vx | vy | vz | i1 | w1 | i2 | w2 | ||
| Model 1 μgal = 1:10 |
Star | 8.35 | 3.35 | 0.425 | 0.85 | 1.1 | 0.14 | 50 | 0 | −86.6 | −103 | 42 | 178 | 0 | 60 | 0 | 240 |
| DM | 36.8 | 15 | — | 3.68 | 2.5 | — | |||||||||||
| Model 2 μgal = 1:3 |
Star | 0.85 | 1.6 | 0.3 | 0.15 | 0.9 | 0.2 | ||||||||||
| Gas | 7.55 | 12.5 | 2.5 | 2.85 | 7.0 | 1.4 | 80 | 60 | 0 | 80 | 160 | 0 | 70 | 30 | –110 | 30 | |
| DM | 20.5 | 5.6 | — | 6.8 | 3.8 | — | |||||||||||
| Model 3 μgal = 1:3 |
Star | 2.0 | 2.64 | 0.156 | 0.28 | 1.29 | 0.083 | ||||||||||
| Gas | 6.1 | 21.2 | 0.31 | 2.5 | 11.4 | 0.149 | −63 | −76 | 0 | 95 | 255 | 0 | 110 | 30 | −110 | 30 | |
| DM | 75 | 17.5 | — | 25 | 10 | — | |||||||||||
Notes. Masses (M) are given in units of 1010 M⊙ scale lengths (a) and scale heights (h) are given in kiloparsecs. The six-dimensional phase-space coordinates (x, y, z, vx, vy, vz) are given in the Galactocentric frame, with distances in kiloparsecs and velocities in km s−1. Orbital angles are given in degrees. For Model 1, the masses of individual stellar and DM particles are 1.4 × 105 M⊙ and 5.6 × 105 M⊙, respectively. For Models 2 and 3, baryonic (star or gas) and DM particles have masses of 0.6 × 105 M⊙ and 2.3 × 105 M⊙, respectively.
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