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Table 4.
Hα emission, velocity fields, and rotation curve features for NGC 5257 and NGC 5258.
| Hα IMAGE | ||||
|---|---|---|---|---|
| Galaxy | Prominent HII regions | Emission in central parts | Emission along tidal tail | Emission along tidal bridge |
| NGC 5257 | YES -along both spiral arms | NO | YES | YES -at the beginning of the feature |
| NGC 5258 | YES -only one | NO | NO | NO |
| VELOCITY FIELD | ||||
| Galaxy | Central isovelocities | Presence of bar (PA) | Outer isovelocities | Visual signs of interaction |
| NGC 5257 | Parallel to each other, | YES | Follow rotating disc | YES -on tidal tail |
| not perpendicular to major axis | pattern | |||
| NGC 5258 | Parallel to each other, | YES | Isovelocities “V” shape | YES -along disc |
| perpendicular to major axis | rotates along PA | |||
| Hα ROTATION CURVE | ||||
| Galaxy | Kinematic and Photometric | Inner asymmetries | Symmetrical | Bifurcated |
| centres match | ||||
| NGC 5257 | YES -within PUMA seeing | From 0″ to 5″ | From 5″ to 17″ | From 17″ |
| NGC 5258 | YES -within PUMA seeing | From 0″ to 2.5″ | From 2.5″ to 16″ | From 16″ |
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