Imprint of Inhomogeneous Reionization on the Power Spectrum of Galaxy Surveys at High Redshifts

Abstract

We consider the effects of inhomogeneous reionization on the distribution of galaxies at high redshifts. Modulation of the formation process of the ionizing sources by large scale density modes makes reionization inhomogeneous and introduces a spread to the reionization times of different regions with the same size. After sources photo-ionize and heat these regions to a temperature $\ga 10^4$K at different times, their temperatures evolve as the ionized intergalactic medium (IGM) expands. The varying IGM temperature makes the minimum mass of galaxies spatially non-uniform with a fluctuation amplitude that increases towards small scales. These scale-dependent fluctuations modify the shape of the power spectrum of low-mass galaxies at high redshifts in a way that depends on the history of reionization. The resulting distortion of the primordial power spectrum is significantly larger than changes associated with uncertainties in the inflationary parameters, such as the spectral index of the scalar power spectrum or the running of the spectral index. Future surveys of high-redshift galaxies will offer a new probe of the thermal history of the IGM but might have a more limited scope in constraining inflation.

arXiv comment8 pages, 5 figures, replaced to match version accepted by ApJ

References in corpus (27)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
• An analytic model for the spatial clustering of dark matter haloes
• Cosmological parameter analysis including SDSS Ly-alpha forest and galaxy bias: constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• Wilkinson Microwave Anisotropy Probe (WMAP) First Year Observations: TE Polarization
• Equation of State of the Photoionized Intergalactic Medium
• The Growth of HII Regions During Reionization
• Probing the Universe with the Lyman-alpha Forest: I. Hydrodynamics of the Low Density IGM
• Destruction of Molecular Hydrogen During Cosmological Reionization
• Cosmological Reionization by Stellar Sources
• Cosmological Formation of Low-Mass Objects
• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations Through 21 cm Tomography Prior to the Epoch of Structure Formation
• Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
• Photoionization Feedback in Low--Mass Galaxies at High Redshift
• The Thermal Memory of Reionization History
• Statistical Probes of Reionization With 21 cm Tomography
• Biasing and the distribution of dark matter haloes
• Evidence for a Cosmological Stromgren Surface and for Significant Neutral Hydrogen Surrounding the Quasar SDSS J1030+0524
• A Size of ~10 Mpc for the Ionized Bubbles at the End of Cosmic Reionization
• A Study of the Reionization History of Intergalactic Helium with FUSE and VLT
• Is Double Reionization Physically Plausible?
• Identifying the Reionization Redshift from the Cosmic Star Formation Rate
• Improved Constraints on The Neutral Intergalactic Hydrogen Surrounding Quasars at Redshifts z>6
• Detection of He II reionization in the SDSS quasar sample
• Undetected Sources Allow Transmission of the Lyman-alpha Line From Galaxies Prior to Reionization
• Searching for fluctuations in the IGM temperature using the Lyman alpha forest
• The Infuence of Omega_baryon on High-Redshift Structure

Cited by in corpus (17)

• 21-cm cosmology
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• Simulations and Analytic Calculations of Bubble Growth During Hydrogen Reionization
• Studying Reionization with Ly-alpha Emitters
• Measuring the 3D Clustering of Undetected Galaxies Through Cross Correlation of their Cumulative Flux Fluctuations from Multiple Spectral Lines
• The Physics and Early History of the Intergalactic Medium
• Constraining massive neutrinos using cosmological 21 cm observations
• An Empirically-Calibrated Model For Interpreting the Evolution of Galaxies During the Reionization Era
• Cosmological constraints from 21cm surveys after reionization
• The Impact of Temperature Fluctuations on the Lyman-alpha Forest Power Spectrum
• Galaxy surveys, inhomogeneous reionization, and dark energy
• Estimates for the impact of Ultraviolet Background fluctuations on galaxy clustering measurements
• The Imprint of Cosmic Reionization on Galaxy Clustering
• Source Mergers and Bubble Growth During Reionization
• Correlation of supernova redshifts with temperature fluctuations of the Cosmic Microwave Background
• Galaxy Statistics in Pencil-beam Surveys at High Redshifts