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Fig. 2


As a function of stellar mass, gi color for our sample of isolated elliptical (T ≤ −4) galaxies out to z = 0.08 (black filled squares). In addition, we include a sample of elliptical galaxies located in the Coma supercluster (red filled triangles). The red line shows Eq. (10) to separate red/blue galaxies. Blue filled squares and green filled squares show the blue and red isolated ellipticals, which are also star-forming galaxies according to Eq. (11), respectively. The numbers are the ID in the UNAM-KIAS catalog for the former. Magenta open squares correspond to the recently quenched elliptical (RQE) galaxies following the color-color criterion of Sect. 3.3. Top and right panels: normalized density distributions of stellar mass and gi color for isolated elliptical galaxies (gray solid histogram) and elliptical galaxies located in the Coma supercluster (red open histogram), respectively. The integral of each histogram sums to unity.

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