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Table 1

Optical and H I parameters for the two galaxies.

Parameter NGC 891 NGC 7814 Ref.

Morphological type Sb/SBb Sab 1, 2, 3
Centre (α J2000) 2h22m33.41s 0h03m14.89s
            (δ J2000) 42°20′56.9′′ 16°08′43.5′′
Distance (Mpc) 9.5 14.6 1a
LB (L⊙ ,B) 2.5 × 1010 1.3 × 1010 3b
LK (L⊙ ,B) 7.8 × 1010 6.4 × 1010 4
R25 in B-band (kpc) 18.6 9.6 3, 5
R20 in K-band (kpc) 10.4 7.2 4
Systemic velocity (km s-1) 528 ± 2 1043 ± 4 6, 7
Total H I mass (M) 4.1 × 109 1.1 × 109 6, 7
H i inclination (°)  ≳89  ~90 6, 7
1 arcmin  =  (kpc) 2.76 4.25 7

Notes.

(a)

More recent determinations of the distances of NGC 891 and NGC 7814 using the tip of the red giant branch are fully consistent with these values, i.e. 9.1 ± 0.4      Mpc and respectively (Radburn-Smith et al. 2011).

(b)

Corrected for internal and Milky Way extinction.

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