SIM2D parameters of SDSS-DR7 galaxies

Using data from the Sloan Digital Sky Survey (SDSS)-DR7, including structural measurements from 2D surface brightness fits with gim2d, we show how the fraction of quiescent galaxies depends on galaxy stellar mass M*, effective radius Re, fraction of r-band light in the bulge, B/T, and their status as a central or satellite galaxy at 0.01<z<0.2. For central galaxies we confirm that the quiescent fraction depends not only on stellar mass, but also on Re.

The dependence is particularly strong as a function of M*/Re^{alpha}^, with {alpha}~1.5. This appears to be driven by a simple dependence on B/T over the mass range 9<log(M*/M_{sun}_)<11.5, and is qualitatively similar even if galaxies with B/T>0.3 are excluded. For satellite galaxies, the quiescent fraction is always larger than that of central galaxies, for any combination of M*, Re and B/T. The quenching efficiency is not constant, but reaches a maximum of ~0.7 for galaxies with 9<log(M*/M_{sun}_)<9.5 and Re<1kpc.