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We explore the redshift evolution of a curious correlation between thestar-formation properties of central galaxies and their satellites (`galacticconformity') at intermediate to high redshift ($0.4<z<1.9$). Using an extremelydeep near-infrared survey, we study the distribution and properties ofsatellite galaxies with stellar masses, ${\rm log} ({\rm M}_*/{\rmM}_{\odot})>9.7$, around central galaxies at the characteristic Schechterfunction mass, ${\rm M} \sim {\rm M}^{\ast}$. We fit the radial profiles ofsatellite number densities with simple power laws, finding slopes in the range-1.1 to -1.4 for mass-selected satellites, and -1.3 to -1.6 for passivesatellites. We confirm the tendency for passive satellites to be preferentiallylocated around passive central galaxies at $3\sigma$ significance and show thatit exists to at least $z\sim2$. Meanwhile, the quenched fraction of satellitesaround star-forming galaxies is consistent with field galaxies of equal stellarmasses. We find no convincing evidence for a redshift-dependent evolution ofthese trends. One simple interpretation of these results is that only passivecentral galaxies occupy an environment that is capable of independentlyshutting off star-formation in satellite galaxies. By examining the satellitesof higher stellar mass star-forming galaxies (${\rm log} ({\rm M}_*/{\rmM}_{\odot}) > 11$), we conclude that the origin of galactic conformity isunlikely to be exclusively due to the host dark-matter halo mass. Ahalo-mass-independent correlation could be established by either formation biasor a more physical connection between central and satellite star-formationhistories. For the latter, we argue that a star-formation (or AGN) relatedoutburst event from the central galaxy could establish a hot halo environmentwhich is then capable of quenching both central and satellite galaxies.

Galactic conformity and central / satellite quenching, from the satellite profiles of M$^{\ast}$ galaxies at $0.4