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We study how optical galaxy morphology depends on mass and star formation rate (SFR) in the Illustris Simulation. To do so, we measure automated galaxy structures in 10 808 simulated galaxies at z = 0 with stellar masses 109.7 M*/M , disc-dominated galaxies have higher stellar mass than bulge-dominated ones, a possible consequence of the Illustris feedback model. While Illustris galaxies at M* ∼ 1011 M have a reasonable size distribution, those at M* ∼ 1010 M have half-light radii larger than observed by a factor of 2. Furthermore, at M* ∼ 1010.5–1011 M, a relevant fraction of Illustris galaxies have distinct ‘ring-like’ features, such that the bright pixels have an unusually wide spatial extent.
Snyder et al. (Thu,) studied this question.