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We investigate galaxy conformity using the Mufasa cosmological hydrodynamicalsimulation. We show a bimodal distribution in galaxy colour with radius, albeitwith too many low-mass quenched satellite galaxies compared to observations.Mufasa produces conformity in observed properties such as colour, sSFR, and HIcontent; i.e neighbouring galaxies have similar properties. We see analogoustrends in other properties such as in environment, stellar age, H$_2$ content,and metallicity. We introduce quantifying conformity using $S(R)$, measuringthe relative difference in upper and lower quartile properties of theneighbours. We show that low-mass and non-quenched haloes have weak conformity($S(R)\leq 0.5$) extending to large projected radii $R$ in all properties,while high-mass and quenched haloes have strong conformity ($S(R)\sim 1$) thatdiminishes rapidly with $R$ and disappears at $R\geq 1$ Mpc. $S(R)$ isstrongest for environment in low-mass haloes, and sSFR (or colour) in high-masshaloes, and is dominated by one-halo conformity with the exception of HI insmall haloes. Metallicity shows a curious anti-conformity in massive haloes.Tracking the evolution of conformity for $z=0$ galaxies back in time shows thatconformity broadly emerges as a late-time ($z\leq 1$) phenomenon. However, forfixed halo mass bins, conformity is fairly constant with redshift out to $z\geq2$. These trends are consistent with the idea that strong conformity onlyemerges once haloes grow above Mufasa's quenching mass scale of $\sim10^{12}M_\odot$. A quantitative measure of conformity in various properties,along with its evolution, thus represents a new and stringent test of theimpact of quenching on environment within current galaxy formation models.

Mufasa:The strength and evolution of galaxy conformity in various tracers