Table 3.
MW parameters.
| Parameter | Value M1-4 | Value M5 |
|---|---|---|
| Mass of the bulge (Mb) | 1.41 × 1010 M⊙ | 0.95 × 1010 M⊙ |
| Bulge scale-length (b1) | 0.03873 kpc | 0.23 kpc |
| Disc mass (Md) | 8.56 × 1010 M⊙ | 6.6 × 1010 M⊙ |
| Disc scale-length 1 (a1) | 5.31 kpc | 4.22 kpc |
| Disc scale-length 2 (a2) | 0.25 kpc | 0.292 kpc |
| Halo mass (Mh) | 1.07 × 1011 M⊙ | 0.24 × 1011 M⊙ |
| Halo scale-length (a3) | 12 kpc | 2.565 kpc |
| Lumpy galaxy | NO (M1,2,3) | NO |
| YES (M4) | ||
| – Lump mass function | power-law (slope −1.6), | |
| – Minimum lump mass | Mmin ∈ (10, 103) M⊙ | |
| – Maximum lump mass | Mmax ∈ (104, 108) M⊙ | |
| – Lump size | 10–100 pc |
Notes. Values are taken from Allen & Santillan (1991) for M1–M4 and from Irrgang et al. (2013) for M5.
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