"We present matched-resolution maps of H I and CO emission in the Virgo Cluster spiral NGC 4647. The galaxy shows a mild kinematic disturbance in which one side of the rotation curve flattens but the other side continues to rise. This kinematic asymmetry is coupled with a dramatic asymmetry...
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TL;DR Summary: Completely clueless on how to answer this question, came up as part of an assessed lab script Why does 21-cm emission only give the rotation curve of the Galaxy at galactocentric radii less than that of the Solar system? The lab script asking this question made zero... ...