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We investigate the dependence of galaxy structure on a variety of galacticand environmental parameters for ~500,000 galaxies at z<0.2, taken from theSloan Digital Sky Survey data release 7 (SDSS-DR7). We utilise bulge-to-totalstellar mass ratio, (B/T)_*, as the primary indicator of galactic structure,which circumvents issues of morphological dependence on waveband. We rankgalaxy and environmental parameters in terms of how predictive they are ofgalaxy structure, using an artificial neural network approach. We find thatdistance from the star forming main sequence (Delta_SFR), followed by stellarmass (M_*), are the most closely connected parameters to (B/T)_*, and aresignificantly more predictive of galaxy structure than global star formationrate (SFR), or any environmental metric considered (for both central andsatellite galaxies). Additionally, we make a detailed comparison to theIllustris hydrodynamical simulation and the LGalaxies semi-analytic model. Inboth simulations, we find a significant lack of bulge-dominated galaxies at afixed stellar mass, compared to the SDSS. This result highlights a potentiallyserious problem in contemporary models of galaxy evolution.

What shapes a galaxy? - Unraveling the role of mass, environment and star formation in forming galactic structure