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We present intermediate‐resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma cluster, with  −20.6 &lt;  M R   &lt; −15.7.  The photometric and kinematic properties of the brighter galaxies can be cast in terms of parameters which present little scatter with respect to a set of scaling relations known as the fundamental plane. To determine the form of these fundamental scaling relations at lower luminosities, we have measured velocity dispersions for a sample comprising 69 galaxies on the border of the dwarf and giant regime. Combining these data with our photometric survey, we find a tight correlation of luminosity and velocity dispersion,   L ∝σ 2.0  , substantially flatter than the Faber–Jackson relation characterizing giant elliptical galaxies. In addition, the variation of mass‐to‐light ( M / L ) ratio with velocity dispersion is quite weak in our dwarf sample:   M / L ∝σ 0.2 .  Our overall results are consistent with theoretical models invoking large‐scale mass removal and subsequent structural readjustment, e.g. as a result of galactic winds.

Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane