Gas Motions in the Center of the Galaxy NGC 253 from HI Line Interferometry,
OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF
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An interferometric study of HI 21cm line absorption against the central radio source in NGC 253 has yielded an excess of blue-shifted velocities, which is best interpreted as absorption in neutral gas moving towards the observer away from the nucleus, in confirmation of optical studies. While all molecular studies show a feature red shifted relative to the systemic velocity, the present HI study hardly shows any signal at the same velocities.