Subhalos in Galaxy Clusters: Coherent Accretion and Internal Orbits

Han, Chi; Wang, Kuan; Avestruz, Camille; Anbajagane, Dhayaa

doi:10.3847/1538-4357/ad736b

Subhalos in Galaxy Clusters: Coherent Accretion and Internal Orbits

Journal Article · Tue Oct 01 00:00:00 EDT 2024 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/ad736b· OSTI ID:2452849

^[1]; ^[1]; ^[1]; ^[2]

Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Chicago, IL (United States)

Subhalo dynamics in galaxy cluster host halos govern the observed distribution and properties of cluster member galaxies. We use the IllustrisTNG simulation to investigate the accretion and orbits of subhalos found in cluster-size halos. We find that the median change in the major axis direction of cluster-size host halos is approximately 80° between a ∼ 0.1 and the present day. We identify coherent regions in the angular distribution of subhalo accretion, and ∼68% of accreted subhalos enter their host halo through ∼38% of the surface area at the virial radius. The majority of galaxy clusters in the sample have ∼2 such coherent regions. We further measure angular orbits of subhalos with respect to the host major axis and use a clustering algorithm to identify distinct orbit modes with varying oscillation timescales. The orbit modes correlate with subhalo accretion conditions. Subhalos in orbit modes with shorter oscillations tend to have lower peak masses and accretion directions somewhat more aligned with the major axis. One orbit mode, exhibiting the least oscillatory behavior, largely consists of subhalos that accrete near the plane perpendicular to the host halo major axis. Our findings are consistent with expectations from inflow from major filament structures and internal dynamical friction: most subhalos accrete through coherent regions, and more massive subhalos experience fewer orbits after accretion. Our work offers a unique quantification of subhalo dynamics that can be connected to how the intracluster medium strips and quenches cluster galaxies.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0019193

OSTI ID:: 2452849

Alternate ID(s):: OSTI ID: 2951684

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 974; ISSN 0004-637X; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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