Table 1.
Surface brightnesses, colours, and apparent magnitude for the tidal features detected around NGC 922.
| ⟨μg⟩ | ⟨μr⟩ | ⟨μz⟩ | ⟨g − r⟩stream | ⟨g − z⟩stream | mg | mr | mz | |
|---|---|---|---|---|---|---|---|---|
| [mag arcsec−2] | [mag arcsec−2] | [mag arcsec−2] | [mag] | [mag] | [mag] | [mag] | [mag] | |
| Shell | 25.85 ± 0.02 | 25.34 ± 0.01 | 24.96 ± 0.03 | 0.53 ± 0.01 | 0.87 ± 0.005 | 16.80 ± 0.004 | 16.27 ± 0.004 | 15.93 ± 0.003 |
| Tail | 27.92 ± 0.08 | 27.27 ± 0.07 | 27.04 ± 0.16 | 0.61 ± 0.05 | 0.84 ± 0.04 | 19.95 ± 0.04 | 19.35 ± 0.03 | 19.11 ± 0.03 |
| NGC 922 | 22.59 ± 0.003 | 22.23 ± 0.003 | 22.21 ± 0.004 | 0.36 ± 0.003 | 0.58 ± 0.004 |
Notes. For the shell (S) and for the tail (T), the measurements listed are the average of the measurements on the circular apertures placed along the stream showed in Fig. 2. We also include surface brightness and colour for NGC 922, measured using a single aperture in its nominal centre.
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