Fig. 9
B−R color (left panel) and sSFR (right panel) as a function of the halo mass of isolated elliptical (T ≤ −4) galaxies. Blue and green squares show those blue and red star-forming isolated galaxies of the previous figures with halo mass estimates, respectively. The numbers are the ID in the UNAM-KIAS catalog for the blue SF galaxies. Magenta open squares correspond to the isolated RQEs. The dotted line in the left panel is a visual approximation for the trend of simulated elliptical galaxies in Niemi et al. (2010).
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