 Tully-Fisher relation (source code)

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= Tully-Fisher relation
{c}
{title2=$L\propto V^a$}

An empirical relation between the <luminosity> of a disk <galaxy> and its <rotation> <speed>. A simple virial and surface-brightness argument gives $L\propto V^4/(\Upsilon^2I)$, so changes in <mass-to-light ratio> or <surface brightness> change the slope.

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