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We investigate the fraction of quenched satellite galaxies in host galaxygroups and clusters using TNG300 in the IllustrisTNG cosmologicalmagnetohydrodynamical simulations. Simulations show that most satellites arequenched after they fall into their final hosts: post-processing is a moredominant mechanism of galaxy quenching than pre-processing. We find thefraction of quenched satellites at $z=0$ increases with host mass, whichimplies that more massive hosts have higher quenching efficiency because moremassive hosts have more massive groups infalling. Furthermore, we find thathosts that have many early-infall satellites show a higher fraction of quenchedsatellites at $z=0$ than those having many late-infall satellites, whichresults in a scatter of the quenched fraction of satellites in a given massrange of hosts at $z=0$. Our results highlight the significance of the mass ofhosts and the different infall times of satellites in understanding galaxyquenching.

Galaxy Quenching with Mass Growth History of Galaxy Groups and Clusters: The Importance of Post-Processing