The optical color-magnitude relation of galaxies is known to follow a bimodal distribution separating red and blue galaxies. Mignoli et. al. (arXiv:0810.2245v1) used spectral, photometric and morphological classification to see if this bimodality extends to other galaxy optical properties. Figure 5 shows the composite spectra of the three main galaxy classes found from spectral classification of 507 medium resolution spectra.
The three types of measurements were then used to define a classification cube which resulted in 85% concordant classification of galaxies being either quiescent,red,bulge-dominated or star-forming,blue,disk-dominated.
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