SDSS surface photometry of M 31 with absorption corrections

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Table A.1

Calculated parameters of the photometric model.

Population	a₀	q	N	k	h
	(kpc)

Nucleus	0.01	1.00	4.0	1.2626 × 10^-4	3111.43
Bulge	0.63	0.72	2.7	7.2288 × 10^-3	158.920
Disc	7.70	0.17	1.20	3.3418 × 10^-1	6.0071
Young disc^a	10.00	0.01	0.2	1.4895	1.0160
Halo	6.30	0.50	3.0	2.9762 × 10^-6	313.600
Dust disc	15.0	0.01	1.0	0.5000	4.00000

Population	L_u	L_g	L_r	L_i	L_z

Nucleus	0.0008	0.0018	–	–	0.0050
Bulge	0.34	0.58	0.76	1.03	1.29
Disc	0.79	1.07	1.43	1.92	2.05
Young disc^b	0.29	0.24	0.26	0.33	0.25
Halo	0.17	0.21	0.29	0.40	0.80

Notes.

^(a)

Structural parameters for the young disc are given for the positive component only.

^(b)

The luminosity of the young disc is its true luminosity (L = L₊ + L₋, where L₋ = −0.5 L₊). The luminosities are corrected for the intrinsic extinction and the extinction in the Milky Way, and are given in the units of 10¹⁰ L_⊙.

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