Cosmological baryon spread and impact on matter clustering in CAMELS

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dc.contributor.authorGebhardt, Matthew
dc.contributor.authorDavé, Romeel
dc.contributor.authorAnglés-Alcázar, Daniel
dc.date.accessioned2025-01-21T09:24:34Z
dc.date.available2025-01-21T09:24:34Z
dc.date.issued2024
dc.description.abstractWe quantify the cosmological spread of baryons relative to their initial neighbouring dark matter distribution using thousands of state-of-the-art simulations from the cosmology and strophysics with MachinE learning simulations (CAMELS) project. We show that dark matter particles spread relative to their initial neighbouring distribution owing to chaotic gravitational dynamics on spatial scales comparable to their host dark matter halo. In contrast, gas in hydrodynamic simulations spreads much further from the initial neighbouring dark matter owing to feedback from supernovae (SNe) and active galactic nuclei (AGN). We show that large-scale baryon spread is very sensitive to model implementation details, with the fiducial simba model spreading ∼40 per cent of baryons >1 Mpc away compared to ∼10 per cent for the IllustrisTNG and astrid models. Increasing the efficiency of AGN-driven outflows greatly increases baryon spread while increasing the strength of SNe-driven winds can decrease spreading due to non-linear coupling of stellar and AGN feedback. We compare total matter power spectra between hydrodynamic and paired N-body simulations and demonstrate that the baryonic spread metric broadly captures the global impact of feedback on matter clustering over variations of cosmological and astrophysical parameters, initial conditions, and (to a lesser extent) galaxy formation models. Using symbolic regression, we find a function that reproduces the suppression of power by feedback as a function of wave number (k) and baryonic spread up to k ∼10 hMpc-1 in SIMBA while highlighting the challenge of developing models robust to variations in galaxy formation physics implementation.
dc.identifier.citationGebhardt, M., Anglés-Alcázar, D., Borrow, J., Genel, S., Villaescusa-Navarro, F., Ni, Y., Lovell, C.C., Nagai, D., Davé, R., Marinacci, F. and Vogelsberger, M., 2024. Cosmological baryon spread and impact on matter clustering in CAMELS. Monthly Notices of the Royal Astronomical Society, 529(4), pp.4896-4913.
dc.identifier.urihttps://doi.org/10.1093/mnras/stae817
dc.identifier.urihttps://hdl.handle.net/10566/19853
dc.language.isoen
dc.publisherOxford University Press
dc.subjectLarge-scale structure of universe
dc.subjectGalaxies: evolution
dc.subjectGalaxies: formation
dc.subjectHydrodynamic simulations
dc.subjectNATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
dc.titleCosmological baryon spread and impact on matter clustering in CAMELS
dc.typeArticle

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