Table 1
Parameters adopted for 12 models of the M31-MW system.
 (mb) |
 (mb) |
|
b | Tenc (no EF) | Tenc (EF = 0.03a0) |
|
|
|||||
| 180 (0.7) | 225 (1.6) | 17−34 | 22−48 | −7. | −10.2 |
| 180 (0.7) | 215 (1.4) | 17−34 | 19−56 | −7.3 | −11.2 |
| 180 (0.7) | 205 (1.1) | 17−34 | 22−55 | −7.7 | −12.3 |
| 190 (0.85) | 250 (2.5) | 17−34 | 19−47 | −6. | −7.9 |
| 170 (0.55) | 225 (1.6) | 17−34 | 26−54 | −7.2 | −11.0 |
| 180 (0.7) | 225 (1.6) | 0−10 | 0−13 | −7. | −10.2 |
Notes. Columns 1, 2: asymptotic flat circular velocities of the MW and M31 in km s-1, related to the baryonic masses through 
, given after in units of 1011 M⊙; Cols. 3, 4: adopted range for the current tangential velocity of M31 with respect to us, in km s-1, and the corresponding impact parameter b in kpc; Cols. 5, 6: look-back time of the encounter Tenc in Gyr, assuming the LG is in a negligible external field and in a non-negligible external field of 3% of a0, respectively.
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