Table 1
Initial conditions of the N-body simulations: masses and scale lengths.
| Model galaxy properties | Primary | Secondary |
|
|
||
| MDM (1011M⊙) | 7.0 | 0.3 |
| M∗ (1010M⊙) | 7.0 | 0.2 |
| f b / d | 0.25 | 0.25 |
| MG (108M⊙) | 0 | 1.38 |
| Rs (kpc) | 6.0 | 3.0 |
| Rd (kpc) | 3.7 | 3.0 |
| hd (kpc) | 0.37 | 0.30 |
| rB (kpc) | 0.6 | 0.6 |
Notes. MDM is the DM mass; M∗ is the total stellar mass of the galaxy (including both bulge and disc); fb / d is the bulge-to-disc mass ratio; MG is the total gas mass. The primary has no gas, while the gas of the secondary is distributed according to an exponential disc (Hernquist 1993), with the same parameters (scale length and height) as the stellar disc. Rs is the NFW scale radius Rs ≡ R200/c, where R200 is the virial radius of the halo (Navarro et al. 1996) and c the concentration (here we assume c = 12 for both galaxies). Rd and hd are the disc scale length and height, respectively (Hernquist 1993), while rB is the bulge scale length.
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