Inferring the impact of feedback on the matter distribution using the Sunyaev Zel'dovich effect: Insights from CAMELS simulations and ACT+DES data

Abstract

Feedback from active galactic nuclei and stellar processes changes the matter distribution on small scales, leading to significant systematic uncertainty in weak lensing constraints on cosmology. We investigate how the observable properties of group-scale halos can constrain feedback's impact on the matter distribution using Cosmology and Astrophysics with MachinE Learning Simulations (CAMELS). Extending the results of previous work to smaller halo masses and higher wavenumber, $k$, we find that the baryon fraction in halos contains significant information about the impact of feedback on the matter power spectrum. We explore how the thermal Sunyaev Zel'dovich (tSZ) signal from group-scale halos contains similar information. Using recent Dark Energy Survey (DES) weak lensing and Atacama Cosmology Telescope (ACT) tSZ cross-correlation measurements and models trained on CAMELS, we obtain $10\%$ constraints on feedback effects on the power spectrum at $k\sim 5h/\mathrm{Mpc}$. We show that with future surveys, it will be possible to constrain baryonic effects on the power spectrum to $\mathcal{O}(<1\%)$ at $k=1h/\mathrm{Mpc}$ and $\mathcal{O}(3\%)$ at $k=5h/\mathrm{Mpc}$ using the methods that we introduce here. Finally, we investigate the impact of feedback on the matter bispectrum, finding that tSZ observables are highly informative in this case.

18 pages, 15 figures. Comments are welcome

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Cited by in corpus (9)

• DES Y3 + KiDS-1000: Consistent cosmology combining cosmic shear surveys
• Probing the Circum-Galactic Medium with Fast Radio Bursts: Insights from the CAMELS Simulations
• X-raying CAMELS: Constraining Baryonic Feedback in the Circum-Galactic Medium with the CAMELS simulations and eRASS X-ray Observations
• Painting baryons onto N-body simulations of galaxy clusters with image-to-image deep learning
• Distinguishing AGN Feedback Models with the Thermal Sunyaev-Zel'dovich Effect
• Constraining Hot Dark Matter Sub-Species with Weak Lensing and the Cosmic Microwave Background Radiation
• Baryonic Imprints on DM Halos: the concentration-mass relation and its dependence on halo and galaxy properties
• syren-baryon: Analytic emulators for the impact of baryons on the matter power spectrum
• Testing the thermal Sunyaev-Zel'dovich power spectrum of a halo model using hydrodynamical simulations