The Impact of baryonic physics on the kinetic Sunyaev-Zel'dovich Effect

Abstract

Poorly understood "baryonic physics" impacts our ability to predict the power spectrum of the kinetic Sunyaev-Zel'dovich (kSZ) effect. We study this in one sample high resolution simulation of galaxy formation and feedback, Illustris. The high resolution of Illustris allows us to probe the kSZ power spectrum on multipoles $\ell =10^3-3\times 10^4$. Strong AGN feedback in Illustris nearly wipes out gas fluctuations at $k\gtrsim 1h{\mathrm{Mpc}}^{-1}$ and at late times, likely somewhat under predicting the kSZ power generated at $z\lesssim 1$. The post-reionization kSZ power spectrum for Illustris is well-fit by ${\mathcal{D}}_{\ell }^{z<6}=1.38[\ell /3000{]}^{0.21}\mu K^2$ over $3000\lesssim \ell \lesssim 10000$, somewhat lower than most other reported values but consistent with the analysis of Shaw et al. Our analysis of the bias of free electrons reveals subtle effects associated with the multi-phase gas physics and stellar fractions that affect even linear scales. In particular there are fewer electrons in biased galaxies, due to gas cooling and star formation, and this leads to an electron bias less than one even at low wavenumbers. The combination of bias and electron fraction that determines the overall suppression is relatively constant, $f_e^2{b}_{e0}^2\sim 0.7$, but more simulations are needed to see if this is Illustris-specific. By separating the kSZ power into different terms, we find at least $6(10)\%$ of the signal at $\ell =3000(10000)$ comes from non-Gaussian connected four-point density and velocity correlations, ${⟨\delta v\delta v⟩}_c$, even without correcting for the Illustris simulation box size. A challenge going forward will be to accurately model long-wave velocity modes simultaneously with Illustris-like high resolution to capture the complexities of galaxy formation and its correlations with large scale flows.

arXiv comment12 pages, 9 figure, submitted to ApJ

References in corpus (47)

• Populating a cluster of galaxies - I. Results at z=0
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Stable clustering, the halo model and nonlinear cosmological power spectra
• Properties of galaxies reproduced by a hydrodynamic simulation
• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• A model for cosmological simulations of galaxy formation physics
• Cosmic Microwave Background Anisotropies
• The Illustris Simulation: Public Data Release
• The Sunyaev-Zel'dovich angular power spectrum as a probe of cosmological parameters
• A physical model for cosmological simulations of galaxy formation: multi-epoch validation
• Planck intermediate results. XLVII. Planck constraints on reionization history
• A measurement of secondary cosmic microwave background anisotropies from the 2500-square-degree SPT-SZ survey
• On the Cluster Physics of Sunyaev-Zel'dovich Surveys II: Deconstructing the Thermal SZ Power Spectrum
• SZ effects in the Magneticum Pathfinder Simulation: Comparison with the Planck, SPT, and ACT results
• Reionization Revisited: Secondary CMB Anisotropies and Polarization
• Simulations of the Sunyaev-Zel'dovich Power Spectrum with AGN Feedback
• Cosmic microwave background constraints on the duration and timing of reionization from the South Pole Telescope
• The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields: A Novel Probe of the Baryon Distribution with Planck, WMAP, and WISE Data
• Evidence for the kinematic Sunyaev-Zeľdovich effect with ACTPol and velocity reconstruction from BOSS
• Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT
• Deconstructing the kinetic SZ Power Spectrum
• Templates for the Sunyaev-Zel'dovich Angular Power Spectrum
• Precision Epoch of Reionization studies with next-generation CMB experiments
• The kinetic Sunyaev-Zel'dovich signal from inhomogeneous reionization: a parameter space study
• Re-Ionization and its Imprint on the Cosmic Microwave Background
• Detection of the pairwise kinematic Sunyaev-Zel'dovich effect with BOSS DR11 and the Atacama Cosmology Telescope
• The Kinetic Sunyaev-Zel'dovich effect as a probe of the physics of cosmic reionization: the effect of self-regulated reionization
• Nonlinear Kinetic Sunyaev-Zeldovich Effect
• Reionization on Large Scales III: Predictions for Low-ell Cosmic Microwave Background Polarization and High-ell Kinetic Sunyaev-Zel'dovich Observables
• Constraints on gravity and dark energy from the pairwise kinematic Sunyaev-Zeldovich effect
• Constraints on the missing baryons from the kinetic Sunyaev-Zeldovich effect in Planck data
• Calculation of the Ostriker-Vishniac Effect in Cold Dark Matter Models
• The Kinetic Sunyaev-Zel'dovich Effect from Radiative Transfer Simulations of Patchy Reionization
• Precision era of the kinetic Sunyaev-Zeldovich effect: simulations, analytical models and observations and the power to constrain reionization
• A WISE measurement of the ISW effect
• Detecting patchy reionization in the CMB
• Future constraints on halo thermodynamics from combined Sunyaev-Zel'dovich measurements
• Constraints on massive neutrinos from the pairwise kinematic Sunyaev-Zel'dovich effect
• Beyond the Damping Tail: Cross-Correlating the Kinetic Sunyaev-Zel'dovich Effect with Cosmic Shear
• The Cosmic Reionization History as Revealed by the CMB Doppler--21-cm Correlation
• The Kinetic Sunyaev-Zel'dovich Effect from Reionization: Simulated Full Sky Maps at Arcminute Resolution
• Reconstructing cosmic growth with kSZ observations in the era of Stage IV experiments
• Reionization History from Coupled CMB/21cm Line Data
• Cross-Correlation Studies between CMB Temperature Anisotropies and 21 cm Fluctuations
• The Impact of Nonlinear Structure Formation on the Power Spectrum of Transverse Momentum Fluctuations and the Kinetic Sunyaev-Zel'dovich Effect
• The kinematic Sunyaev-Zel'dovich effect of the large-scale structure (I): dependence on neutrino mass

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