Effects of Baryonic Feedback on the Cosmic Web

Abstract

We study the effect of baryons on the cosmic web -- halos, filaments, walls, and voids. To do so, we apply a modified version of NEXUS, a cosmic web morphological analysis algorithm, to the IllustrisTNG simulations. We find that halos lose more than $10\%$ of their mass due to baryons, mostly to filaments and a small portion to walls and voids. However, the mass transfer does not significantly shift the boundaries of structures, leaving the volume fractions of the cosmic structures largely unaffected. We quantify the effects of baryonic feedback on the power spectrum and the probability density function (PDF) of the density field for individual cosmic structures. For the power spectrum, most suppression due to feedback can be accounted for by including $M\ge 10^{12}{M}_{\odot }/h$ halos, without considering other cosmic structures. However, when examining the PDF of the density field, we find nearly $100\%$ suppression of the emptiest regions and $10\%$-level effects (boost or suppression) in the remaining regions of filaments, walls, and voids. Our results indicate the importance of modeling the effects of baryons in the whole cosmic web, not just halos, for cosmological analysis beyond two-point statistics or field-based inferences.

7 pages, 4 figures

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• The boundary of cosmic filaments
• The Dispersion Measure Contributions of the Cosmic Web
• Impact of baryonic feedback on HSC Y1 weak lensing non-Gaussian statistics
• How do baryonic effects on the cosmic matter distribution vary with scale and local density environment?
• Quasi-2D Weak Lensing Cosmological Constraints Using the PDF-SYM method
• The Power of the Cosmic Web
• Cosmological constraints from HSC Y1 lensing convergence PDF
• Disentangling the Halo: Joint Model for Measurements of the Kinetic Sunyaev-Zeldovich Effect and Galaxy-Galaxy Lensing
• Principal Components for Model-Agnostic Modified Gravity with 3x2pt
• Marked statistics across the cosmic web: Environmental dependent clustering in modified gravity simulations