The Circumgalactic Medium by High Performance Computation: AGORA project VI

Simulations of cosmological galaxy formation follow the non-linear

interaction of gravity and hydrodynamics and include sophisticated

models of sub-grid phyics, i.e., physics below the resolution of the

simulation. Hence determining the robustness of their results is

difficult. The Assembling Galaxies of Resolved Anatomy (AGORA)

project aims to address this difficulty by comparing the results of a

variety of independently developed codes run on common problems. Here

we present in-preparation results from this project regarding the

properties of the Circumgalactic Medium (CGM), highlighting

contributions from the N-body hydrodynamic code, ChaNGa. The CGM

properties of interest are the ionization levels of atoms and metal

distribution, in addition to others. In contrast to previous AGORA

projects (e.g. S. Roca-Fabrega, et al., ApJ, 971, 64 (2021)), the

parameters for the supernova feedback subgrid model were left to the

individual codes, making this project fascinating for the diversity of

CGM results we present.