Mufasa:The strength and evolution of galaxy conformity in various
  tracers
  We investigate galaxy conformity using the Mufasa cosmological hydrodynamical
simulation. We show a bimodal distribution in galaxy colour with radius, albeit
with too many low-mass quenched satellite galaxies compared to observations.
Mufasa produces conformity in observed properties such as colour, sSFR, and HI
content; i.e neighbouring galaxies have similar properties. We see analogous
trends in other properties such as in environment, stellar age, H$_2$ content,
and metallicity. We introduce quantifying conformity using $S(R)$, measuring
the relative difference in upper and lower quartile properties of the
neighbours. 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 ($S(R)\sim 1$) that
diminishes rapidly with $R$ and disappears at $R\geq 1$ Mpc. $S(R)$ is
strongest for environment in low-mass haloes, and sSFR (or colour) in high-mass
haloes, and is dominated by one-halo conformity with the exception of HI in
small haloes. Metallicity shows a curious anti-conformity in massive haloes.
Tracking the evolution of conformity for $z=0$ galaxies back in time shows that
conformity broadly emerges as a late-time ($z\leq 1$) phenomenon. However, for
fixed halo mass bins, conformity is fairly constant with redshift out to $z\geq
2$. These trends are consistent with the idea that strong conformity only
emerges once haloes grow above Mufasa's quenching mass scale of $\sim
10^{12}M_\odot$. A quantitative measure of conformity in various properties,
along with its evolution, thus represents a new and stringent test of the
impact of quenching on environment within current galaxy formation models.
