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Table 1

Mass distribution parameters for the disc components of M 31 (see Sect. 3.2).

Component a c ϵ N d N ρ c M
[kpc] [M pc-3] [109M]

Main stellar disc 10.67 0.17 1.2 3.273 1.307 × 10-2 56
Young stellar disc 11.83 0.01 0.2 0.316 1.179 × 10-2 1
Cold gas disc 11.83 0.01 0.2 0.316 2.946 × 10-2 2.5
Warm gas disc 11.83 0.03 0.2 0.316 1.375 × 10-2 3.5

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