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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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