Table 3.

MW parameters.

Parameter Value M1-4 Value M5
Mass of the bulge (Mb) 1.41 × 1010M 0.95 × 1010M
Bulge scale-length (b1) 0.03873 kpc 0.23 kpc
Disc mass (Md) 8.56 × 1010M 6.6 × 1010M
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 × 1011M 0.24 × 1011M
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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