In the 1970s,it was discovered that,among spiral galaxies,the wider the 21-cm radio emission line,the brighter the galaxy.What is the name of this relation?

Name: In the 1970s,it was discovered that,among spiral galaxies,the wider the 21-cm radio emission line,the brighter the galaxy.What is the name of this relation?
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This relation is known as the Tully-Fisher relation, which is a correlation between the width of the 21-cm radio emission line and the luminosity of a spiral galaxy.

In the 1970s,it Was Discovered That,among Spiral Galaxies,the Wider the 21-Cm