The DREAMS Project: A New Suite of 1,024 Simulations to Contextualize the Milky Way and Assess Physics Uncertainties
Jonah C. Rose, Mariangela Lisanti, Paul Torrey, Francisco Villaescusa-Navarro, Alex M. Garcia, Arya Farahi, Carrie Filion, Alyson M. Brooks, Nitya Kallivayalil, Kassidy E. Kollmann, Ethan Lilie, Bonny Y. Wang, Akaxia Cruz, Sandip Roy, Andrew B. Pace, Niusha Ahvazi

TL;DR
The DREAMS Project introduces 1,024 diverse simulations of Milky Way-like galaxies to quantify uncertainties and explore galaxy formation, emphasizing the importance of large samples for understanding our galaxy's unique history.
Contribution
This work provides a comprehensive suite of simulations with a novel weighting scheme, enabling detailed statistical analysis of Milky Way analogs and their formation histories.
Findings
Galaxies with GSE analogs have lower star formation rates.
Significant halo-to-halo scatter persists, indicating stochastic galaxy formation.
Matching only major events is insufficient to replicate the Milky Way's properties.
Abstract
We introduce a new suite of 1,024 cosmological and hydrodynamical zoom-in simulations of Milky Way-mass halos, run with Cold Dark Matter, as part of the DREAMS Project. Each simulation in the suite has a unique set of initial conditions and combination of cosmological and astrophysical parameters. The suite is designed to quantify theoretical uncertainties from halo-to-halo variance, as well as stellar and black hole feedback. We develop a novel weighting scheme that prioritizes regions of the input parameter space, yielding galaxies consistent with the observed present-day stellar mass--halo mass relation. The resulting galaxy population exhibits a wide diversity in structural properties that encompasses those of the actual Milky Way, providing a powerful statistical sample for galactic archaeology. To demonstrate the suite's scientific utility, we investigate the connection between a…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
