The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Satellite Galaxies. Rose, J. C., Lisanti, M., Torrey, P., Villaescusa-Navarro, F., Garcia, A. M., Farahi, A., Filion, C., Brooks, A. M., Kallivayalil, N., Kollmann, K. E., Lilie, E., Li, J., Mostow, O., Cruz, A., Nguyen, T., Roy, S., Pace, A. B., Ahvazi, N., O'Neil, S., Shen, X., Cyr-Racine, F., Price-Whelan, A. M., Geha, M., Necib, L., Vogelsberger, M., Muñoz, J. B., & Dalcanton, J. J. 2025. Version Number: 1![The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Satellite Galaxies [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex We analyze the properties of satellite galaxies around 1,024 Milky Way-mass hosts from the DREAMS Project, simulated within a ΛCDM cosmology. Utilizing the TNG galaxy-formation model, the DREAMS simulations incorporate both baryonic physics and cosmological uncertainties for a large sample of galaxies with diverse environments and formation histories. We investigate the relative impact of the physical uncertainty from the galaxy-formation model on predicted satellite properties using four metrics: the satellite stellar mass function, radial distribution, inner slope of dark matter density profile, and stellar half-light radius. We compare these predictions to observations from the SAGA Survey and the DREAMS N-body simulations and find that uncertainties from baryonic physics modeling are subdominant to the scatter arising from halo-to-halo variance. Where baryonic modeling does affect satellites, the supernova wind energy has the largest effect on the satellite properties that we investigate. Specifically, increased supernova wind energy suppresses the stellar mass of satellites and results in more extended stellar half-light radii. The adopted wind speed has only a minor impact, and other astrophysical and cosmological parameters show no measurable effect. Our findings highlight the robustness of satellite properties against uncertainties in baryonic physics modeling.
@misc{rose_dreams_2025,
title = {The {DREAMS} {Project}: {Disentangling} the {Impact} of {Halo}-to-{Halo} {Variance} and {Baryonic} {Feedback} on {Milky} {Way} {Satellite} {Galaxies}},
copyright = {Creative Commons Attribution 4.0 International},
shorttitle = {The {DREAMS} {Project}},
url = {https://arxiv.org/abs/2512.02095},
doi = {10.48550/ARXIV.2512.02095},
abstract = {We analyze the properties of satellite galaxies around 1,024 Milky Way-mass hosts from the DREAMS Project, simulated within a ΛCDM cosmology. Utilizing the TNG galaxy-formation model, the DREAMS simulations incorporate both baryonic physics and cosmological uncertainties for a large sample of galaxies with diverse environments and formation histories. We investigate the relative impact of the physical uncertainty from the galaxy-formation model on predicted satellite properties using four metrics: the satellite stellar mass function, radial distribution, inner slope of dark matter density profile, and stellar half-light radius. We compare these predictions to observations from the SAGA Survey and the DREAMS N-body simulations and find that uncertainties from baryonic physics modeling are subdominant to the scatter arising from halo-to-halo variance. Where baryonic modeling does affect satellites, the supernova wind energy has the largest effect on the satellite properties that we investigate. Specifically, increased supernova wind energy suppresses the stellar mass of satellites and results in more extended stellar half-light radii. The adopted wind speed has only a minor impact, and other astrophysical and cosmological parameters show no measurable effect. Our findings highlight the robustness of satellite properties against uncertainties in baryonic physics modeling.},
language = {en},
urldate = {2025-12-18},
publisher = {arXiv},
author = {Rose, Jonah C. and Lisanti, Mariangela and Torrey, Paul and Villaescusa-Navarro, Francisco and Garcia, Alex M. and Farahi, Arya and Filion, Carrie and Brooks, Alyson M. and Kallivayalil, Nitya and Kollmann, Kassidy E. and Lilie, Ethan and Li, Jiaxuan and Mostow, Olivia and Cruz, Akaxia and Nguyen, Tri and Roy, Sandip and Pace, Andrew B. and Ahvazi, Niusha and O'Neil, Stephanie and Shen, Xuejian and Cyr-Racine, Francis-Yan and Price-Whelan, Adrian M. and Geha, Marla and Necib, Lina and Vogelsberger, Mark and Muñoz, Julian B. and Dalcanton, Julianne J.},
year = {2025},
note = {Version Number: 1},
keywords = {Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences},
}
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