A tale of two galaxies: light and mass in NGC 891 and NGC 7814

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Table 5

Fits to the rotation curves.

Parameter	NGC 891	NGC 7814

Maximum light
Bulge M/L_{3.6 μm}	1.64 ± 0.07	0.64 ± 0.03
Disk M/L_{3.6 μm}	0.90 ± 0.02	9.25 ± 0.27
Reduced χ²	1.05^a	0.59^a

Isothermal halo
Bulge M/L_{3.6 μm}	1.63 ± 0.25	0.71 ± 0.05
Disk M/L_{3.6 μm}	0.77 ± 0.16	0.68 ± 0.94
DM halo ρ₀(10^-3M_⊙ pc^-3)	33.1 ± 16.0	152.4 ± 95.7
DM core radius r₀ (kpc)	1.9 ± 4.4	2.1 ± 0.6
Reduced χ²	1.30	0.39

Notes.

^(a)

Referred to the radial range where the fit is performed (within 3 scale-lengths), see text.

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