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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).
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