These figures are based on Figs 3 and 4 from Rodriguez-Gomez+ (2019), but in this case we extend the analysis (originally for TNG100) to the highly detailed TNG50 simulation. Left: Idealized synthetic images (using Pan-STARRS1 g,r,i filters) of randomly selected galaxies from the TNG50 simulation, generated with the SKIRT radiative transfer code. The text labels indicate the total stellar mass and the 3D stellar half-mass radius. Right: Corresponding realistic images (i-band) obtained by adding background noise and convolving with an appropriate PSF. The text labels indicate some of the morphological measurements carried out by statmorph, specifically the Gini-M20 (Lotz et al. 2004; Snyder et al. 2015) and concentration-asymmetry-smoothness (CAS; Conselice 2003) statistics, as well as the Sérsic index (Sérsic 1968). The black contour shows the region used to calculate the Gini--M20 statistics, which roughly corresponds to a Petrosian radius.

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