A tight two-parameter correlation between velocity dispersion and Dn, the diameter (in kpc) at which the mean interior surface brightness is 20.75. It transpires, this plot is effectively looking at the fundamental plane almost edge on.
The Dn vs Sigma Relation |
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A tight two-parameter correlation between velocity dispersion and Dn, the diameter (in kpc) at which the mean interior surface brightness is 20.75. It transpires, this plot is effectively looking at the fundamental plane almost edge on. |