Patchy Kinetic Sunyaev-Zel'dovich Effect with Controlled Reionization History and Morphology

Abstract

Using the novel semi-numerical code for reionization AMBER, we model the patchy kinetic Sunyaev-Zel'dovich (kSZ) effect by directly specifying the reionization history with the redshift midpoint $z_{\mathrm{mid}}$, duration ${\Delta }_{\mathrm{z}}$, and asymmetry $A_{\mathrm{z}}$. We further control the ionizing sources and radiation through the minimum halo mass $M_{\mathrm{h}}$ and the radiation mean free path ${\lambda }_{\mathrm{mfp}}$. AMBER reproduces the free electron number density and the patchy kSZ power spectrum of radiation-hydrodynamic simulations at the target resolution ($1\mathrm{Mpc}/h$) with matched reionization parameters. With a suite of $(2\mathrm{Gpc}/h{)}^3$ simulations using AMBER, we first constrain the redshift midpoint $6.0<z_{\mathrm{mid}}<8.9$ using the Planck2018 Thomson optical depth result (95\% CL). Then, assuming $z_{\mathrm{mid}}=8$, we find that the amplitude of $D_{\ell =3000}^{\mathrm{pkSZ}}$ scales linearly with the duration of reionization ${\Delta }_z$, and is consistent with the $1\sigma$ upper limit from the South Pole Telescope (SPT) results up to ${\Delta }_z<5.1$ (${\Delta }_z$ encloses $5\%$ to $95\%$ ionization). Moreover, a shorter ${\lambda }_{\mathrm{mfp}}$ can lead to a $\sim 10\%$ lower $D_{\ell =3000}^{\mathrm{pkSZ}}$ and a flatter slope in the ${\Delta }_z-D_{\ell =3000}^{\mathrm{pkSZ}}$ scaling relation, thereby affecting the constraints on ${\Delta }_z$ at $\ell =3000$. Allowing $z_{\mathrm{mid}}$ and ${\lambda }_{\mathrm{mfp}}$ to vary simultaneously, we get spectra consistent with the SPT result ($95\%$ CL) up to ${\Delta }_z=12.8$ (but $A_z>8$ is needed to ensure an end of reionization before $z=5.5$). We show that constraints on the asymmetry require $\sim 0.1\mu k^2$ measurement accuracy at multipoles other than $\ell =3000$. Finally, we find that the amplitude and shape of the kSZ spectrum are only weakly sensitive to $M_h$ under a fixed reionization history and radiation mean-free path.

20 pages, 17 Figures; comments welcome

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Cited by in corpus (11)

• A Short Introduction to Reionization Physics
• Projected-Field Kinetic Sunyaev-Zel'dovich Cross-Correlations: Halo Model and Forecasts
• First Constraints on the Epoch of Reionization Using the non-Gaussianity of the Kinematic Sunyaev-Zel{'}dovich Effect from the South Pole Telescope and {\it Herschel}-SPIRE Observations
• The Morphology of Reionization in a Dynamically Clumpy Universe
• The Atacama Cosmology Telescope: DR6 Power Spectrum Foreground Model and Validation
• A framework to mitigate patchy reionization contamination on the primordial gravitational wave signal
• Constraining cosmic reionization by combining the kinetic Sunyaev-Zel'dovich and the 21 cm power spectra
• Breaking the ${\tau }_{\mathrm{T}}-f$ degeneracy of the kinetic Sunyaev Zel'dovich cosmology in redshift space
• Modified Cosmology or Modified Galaxy Astrophysics is Driving the z>6 JWST Results? CMB Experiments can discover the Origin in the Near Future
• Cross-correlating the patchy screening and kinetic Sunyaev-Zel'dovich effects as a new probe of reionization
• A Novel kinetic Sunyaev-Zel'dovich Estimator for Electron-Electron Correlations