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

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Table 4

Spitzer 3.6 μm-band photometric parameters for the two galaxies.

Parameter	NGC 891		NGC 7814

	Thin disk	Thick disk
h_R (kpc)	4.18	5.13	4.26
Σ_e (L_{⊙ ,3.6 μm} pc^-2)	443.5	368.9	78.0
h_z (kpc)	0.25	0.80^a	0.44
L_disk (L_{⊙ ,3.6 μm})	4.4 × 10¹⁰^b	5.1 × 10¹⁰^b	8.4 × 10⁹

Sérsic index	2.99		4.0^a
r_e (kpc)	1.80		2.16
I_e (L_{⊙ ,3.6 μm} pc^-2)	525.8		1.12 × 10³
q	0.68		0.61
L_bulge (L_{⊙ ,3.6 μm})	2.2 × 10¹⁰		7.0 × 10¹⁰

Notes.

^(a)

Fixed in the fit;

^(b)

calculated out to R = 17 kpc without considering the truncation.

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