FIRE simulation project

large-scale gas distribution (left), face-on (middle) and edge-on (rIght) real-color stellar image of a FIRE cosmological simulation of a Milky Way-mass galaxy

The Feedback In Realistic Environments (FIRE) simulation project is pushing the resolution frontier in cosmological zoom-in simulations of galaxies, in order to pursue a new ‘bottom-up’ approach of directly resolving the multi-phase interstellar medium (ISM) while directly implementing stellar evolution models in galaxy simulations. Thus, we seek to improve the predictive power of galaxy formation models and connect them to underlying stellar populations.

My group at UC Davis is a core member of the FIRE collaboration.

We recently released our updated FIRE-2 physics model for galaxy formation.

Our Gizmo source code for running FIRE-2 simulations is publicly available on

Some of our FIRE-2 simulations are publicly available! Full simulation snapshots at z = 0 from 3 of our Latte FIRE-2 simulations of Milky Way-like galaxies, along with synthetic Gaia DR2-like surveys created from these simulations, are publicly available on yt Hub.

FIRE resources

FIRE project website

Hopkins 2015
Describes the Gizmo source code and new mesh-free hydrodynamics method.

Hopkins, Wetzel et al 2018
Provides a complete description of the FIRE-2 physics model, with numerous numerical tests.

Hopkins, Wetzel et al 2018
Describes in detail our method for modeling mechanical feedback from supernova explosions and stellar mass loss in FIRE-2 simulations.

Hopkins et al 2019
Describes in detail our method for modeling radiative feedback from stars in FIRE-2 simulations.

Gizmo users guide
Comprehensive documentation of the Gizmo source code (which we use to run FIRE-2 simulations) and contents of simulation snapshots.

Gizmo source code
Publicly available version of the Gizmo source code (written in C), which contains (almost) all of our FIRE-2 physics modules.

Gizmo snapshot reader and analysis package
Python software package that I develop and use to read and analyze Gizmo snapshots of FIRE-2 simulations.

Publicly available Latte FIRE-2 simulation snapshots + synthetic Gaia surveys
Full simulation snapshots at z = 0 and synthetic Gaia DR2-like surveys from 3 of our Latte simulations.