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NSF-Simons AI Institute for Cosmic Origins
02 Dec 2025
astrophysics-of-galaxiesphysics

The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Density Profiles

Northeastern University logoNortheastern UniversityNorthwestern University logoNorthwestern UniversityBoston University logoBoston UniversityCERN logoCERNMIT logoMITPrinceton University logoPrinceton UniversityFlatiron Institute logoFlatiron InstituteINFN Roma1Grinnell CollegeKavli Institute for Astrophysics and Space ResearchConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET)NSF-Simons AI Institute for the SkyNSF-Simons AI Institute for Cosmic Origins
The DREAMS Project, based on IllustrisTNG simulations, quantifies the relative impact of baryonic feedback and intrinsic halo-to-halo variance on Milky Way dark matter density profiles, revealing that halo-to-halo variation is the dominant source of scatter. The study also demonstrates IllustrisTNG halos generally contract adiabatically, contrasting with bursty feedback models like FIRE-2.
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