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Subhalo dynamics in galaxy cluster host halos govern the observeddistribution and properties of cluster member galaxies. We use the IllustrisTNGsimulation to investigate the accretion and orbits of subhalos found incluster-size halos. We find that the median change in the major axis directionof cluster-size host halos is approximately $80$ degrees between $a\sim0.1$ andpresent-day. We identify coherent regions in the angular distribution ofsubhalo accretion, and $\sim 68\%$ of accreted subhalos enter their host halothrough $\sim38\%$ of the surface area at the virial radius. The majority ofgalaxy clusters in the sample have $\sim2$ such coherent regions, likelycorresponding to cluster-feeding filaments. We further measure angular orbitsof subhalos with respect to the host major axis and use a clustering algorithmto identify distinct orbit modes with varying oscillation timescales. The orbitmodes correlate with subhalo accretion conditions. Subhalos in orbit modes withshorter oscillations tend to have lower peak masses and accretion directionssomewhat more aligned with the major axis. One orbit mode, exhibiting the leastoscillatory behavior, largely consists of subhalos that accrete near the planeperpendicular to the host halo major axis. Our findings are consistent withexpectations from inflow from major filament structures and internal dynamicalfriction: most subhalos accrete through filaments, and more massive subhalosexperience fewer orbits after accretion. Our work offers a uniquequantification of subhalo dynamics that can be connected to how theintracluster medium strips and quenches cluster galaxies.

Subhalos in Galaxy Clusters: Coherent Accretion and Internal Orbits