Tully-Fisher relation

Abstract

Detailed neutral hydrogen observations have been obtained of the large barred spiral galaxy NGC 3992 and its three small companion spiral galaxies, UGC 6923, UGC 6940, and UGC 6969. Contrary to the large galaxy, for the companions the H i distribution ends quite abruptly at the optical edges. Velocity fields have been constructed from which rotation curves… (More)

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