Publications

A number of papers have been published by the group and collaborators.

Papers stemming from this flagship paper can be found at the following ADS link.

The Caterpillar Project: A Large Suite of Milky Way Sized Halos

Griffen, Brendan F.; Ji, Alexander P.; Dooley, Gregory A.; Gómez, Facundo A.; Vogelsberger, Mark; O'Shea, Brian W.; Frebel, Anna.

We present the largest number of Milky Way sized dark matter halos simulated at very high mass (~104 /particle) and temporal resolution (5 Myr/snapshot) done to date, quadrupling what is currently available in the literature. This initial suite consists of the first 24 halos of the Caterpillar Project whose project goal of 60-70 halos will be made public when complete. We do not bias our halo selection by the size of the Lagrangian volume. We resolve ~20,000 gravitationally bound subhalos within the virial radius of each host halo. Improvements were made upon current state-of-the-art halo finders to better identify substructure at such high resolutions, and on average we recover ~4 subhalos in each host halo above 108 {M}⊙ which would have otherwise not been found. The density profiles of relaxed host halos are reasonably fit by Einasto profiles (α = 0.169 ± 0.023) with dependence on the assembly history of a given halo. Averaging over all halos, the substructure mass fraction is fm,subs = 0.121 ± 0.041, and mass function slope is dN/dM α {M}-1.88 ± 0.10. We find concentration-dependent scatter in the normalizations at fixed halo mass. Our detailed contamination study of 264 low-resolution halos has resulted in unprecedentedly large high-resolution regions around our host halos for our fiducial resolution (sphere of radius ~ 1.4 ± 0.4 Mpc). This suite will allow detailed studies of low mass dwarf galaxies out to large galactocentric radii and the very first stellar systems at high redshift (z > 15).