Shared particle fractions in direct progenitors

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Summary: We calculate the shared particle fractions of direct progenitor halos after crossmatching all halos and progenitors from the original dark matter simulation (run with Rockstar) and their merger trees output (from Consistent-Trees).

Simulation

resolution: 256^3 particles
hereafter: 256-Cholla (Schneider & Robertson 2015, Villaseñor et al. 2020)
box side-length: 50 h-1Mpc
particle mass: 8.04x10^7 h-1Msun
total particles processed: 2097124
force resolution: 195.3 h-1kpc

Detection of phantom halos

All halos an merger trees. Highlighted are in the first halo of the tree (red cross), phantom halos (solid yellow dot), the next halo in the tree after the phantom halo (black circle).

Same as in Fig: 1 but only TreeID-79198 and its subtrees are shown as an example.

Same as in Figure 1 but only TreeID-79561 and its subtrees are shown as an example.

Shared particle fractions

Redshift evolutin of shared fraction

The shared particle fractions of direct progenitors within 10^{th} and 90^{th} percentiles.

Observations & Open Questions

Median on shared particle fraciton is mostly over 90 %
There are two dips in the z-evolution of the shared particle fraction at 1.0 and 2.0. Where do they come from?

Halo mass accrection and growth histories

Snapshot Binning Schemes of Cosmological Simulations

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