Stellar mass map and dark matter distribution in M 31

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Table 2

Parameters of stellar components.

Component	a ₀ ^a	a _c	q	N	d _N	ρ _c	M _comp ^b	M/L_g^b	M/L_r^b	M/L_i^b
	[kpc]	[kpc]				[M_⊙ pc^-3]	[10¹⁰ M_⊙]	[M_⊙/L_⊙]	[M_⊙/L_⊙]	[M_⊙/L_⊙]

Nucleus	0.01	0.0234	0.99	4.0	11.668	1.713 × 10⁰	0.008	4.44	3.20	2.35
Bulge	0.63	1.155	0.72	2.7	7.769	9.201 × 10^-1	3.1	5.34	4.08	3.01
Disc	7.7	10.67	0.17	1.2	3.273	1.307 × 10^-2	5.6	5.23	3.92	2.92
Young disc^c	10.0	11.83	0.01	0.2	0.316	1.179 × 10^-2	0.1	1.23	1.12	0.88
Stellar halo	6.3	12.22	0.50	3.0	8.669	4.459 × 10^-4	1.3	6.19	4.48	3.25

Notes. Structural parameters a₀, q, N, and galaxy luminosities in SDSS filters (L_g, L_r, L_i) are taken from Tempel et al. (2011). Component masses M_comp are derived in this paper.

^(a)

Harmonic mean radius (see Appendix B).

^(b)

Masses and mass-light-ratios corresponding to the B07 model, i.e. the lower limits; the upper limits (from the maximum-stellar model) are 1.5 times higher in each case.

^(c)

The structural parameters and ρ_c are given for the positive component. In the dynamical models, the gas mass 6 × 10⁹ M_⊙ is added to the young disc.

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