Reionization on Large Scales IV: Predictions for the 21 cm signal incorporating the light cone effect

Abstract

We present predictions for the 21 cm brightness temperature power spectrum during the Epoch of Reionization (EoR). We discuss the implications of the "light cone" effect, which incorporates evolution of the neutral hydrogen fraction and 21 cm brightness temperature along the line of sight. Using a novel method calibrated against radiation-hydrodynamic simulations, we model the neutral hydrogen density field and 21 cm signal in large volumes ($L=2$ Gpc/$h$). The inclusion of the light cone effect leads to a relative decrease of about 50% in the 21 cm power spectrum on all scales. We also find that the effect is more prominent at the midpoint of reionization and later. The light cone effect also can introduce an anisotropy along the line of sight. By decomposing the 3D power spectrum into components perpendicular to and along the line of sight, we find that in our fiducial reionization model, there is no significant anisotropy. However, parallel modes can contribute up to 40% more power for shorter reionization scenarios. The scales on which the light cone effect is relevant are comparable to scales where one measures the baryon acoustic oscillation. We argue that due to its large comoving scale and introduction of anisotropy, the light cone effect is important when considering redshift space distortions and future application to the Alcock-Paczynski test for the determination of cosmological parameters.

20 pages, 14 figures

References in corpus (15)

• Planck 2013 results. XVI. Cosmological parameters
• New Constraints on Cosmic Reionization from the 2012 Hubble Ultra Deep Field Campaign
• A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment
• The CMBR fluctuations from HI perturbations prior to reionization
• Opening the 21cm EoR Window: Measurements of Foreground Isolation with PAPER
• Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• Imprint of Inhomogeneous Hydrogen Reionization on the Temperature Distribution of the Intergalactic Medium
• An Improved Method for 21cm Foreground Removal
• Power spectrum extraction for redshifted 21-cm epoch of reionization experiments: the LOFAR case
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological constraints from the full shape of the clustering wedges
• Cosmic Reionization and the 21-cm signal: Comparison between an analytical model and a simulation
• Probing reionization with LOFAR using 21-cm redshift space distortions
• Current models of the observable consequences of cosmic reionization and their detectability
• The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Measuring H(z) and D_A(z) at z = 0.57 with Clustering Wedges

Cited by in corpus (40)

• Data Analysis for Precision 21 cm Cosmology
• HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
• The Impact of the First Galaxies on Cosmic Dawn and Reionization
• Eliminating the optical depth nuisance from the CMB with 21 cm cosmology
• Quantifying the non-Gaussianity in the EoR 21-cm signal through bispectrum
• The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology
• 21 cm signal from cosmic dawn: Imprints of spin temperature fluctuations and peculiar velocities
• 21CMMC with a 3D light-cone: the impact of the co-evolution approximation on the astrophysics of reionisation and cosmic dawn
• SCORCH I: The Galaxy-Halo Connection in the First Billion Years
• Constraining cosmology and ionization history with combined 21 cm power spectrum and global signal measurements
• 21-cm signal from cosmic dawn - II: Imprints of the light-cone effects
• Simulating the 21-cm signal from reionisation including non-linear ionisations and inhomogeneous recombinations
• Towards simulating and quantifying the light-cone EoR 21-cm signal
• Spherical Harmonic Analyses of Intensity Mapping Power Spectra
• Recovering the Wedge Modes Lost to 21-cm Foregrounds
• AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
• Machine Learning Applied to the Reionization History of the Universe in the 21 cm Signal
• Predictions for measuring the 21-cm multi-frequency angular power spectrum using SKA-Low
• The 21 cm-kSZ-kSZ Bispectrum during the Epoch of Reionization
• A method to determine the evolution history of the mean neutral Hydrogen fraction
• The Epoch of Reionization 21-cm Bispectrum: The impact of light-cone effects and detectability
• Inevitable imprints of patchy reionization on the cosmic microwave background anisotropy
• Prospects for 21cm-Galaxy Cross-Correlations with HERA and the Roman High-Latitude Survey
• Machine-learning recovery of foreground wedge-removed 21-cm light cones for high-$z$ galaxy mapping
• Prospects for kSZ${}^2$-Galaxy Cross-Correlations during Reionization
• Generating extremely large-volume reionisation simulations
• Implications of the $z>5$ Lyman-$\alpha$ forest for the 21-cm power spectrum from the epoch of reionization
• CII and HI 21-cm line intensity mapping from the EoR: Impact of the light-cone effect on auto and cross-power spectra
• A galaxy-free phenomenological model for the 21-cm power spectrum during reionization
• Simultaneously constraining the astrophysics of reionisation and the epoch of heating with 21CMMC
• Upper Limits on the 21 cm Power Spectrum at z = 5.9 from Quasar Absorption Line Spectroscopy
• 21cmFirstCLASS II. Early linear fluctuations of the 21cm signal
• A Full Treatment of Peculiar Velocities on the Reionization Light Cone
• Understanding the Impact of Semi-numeric Reionization Models when using CNNs
• Line of sight anisotropies in the Cosmic Dawn and EoR 21-cm power spectrum
• Measuring the reionization 21 cm fluctuations using clustering wedges
• Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal
• A statistical framework for recovering intensity mapping autocorrelations from crosscorrelations
• Radiative transfer of 21-cm line through ionised cavities in an expanding universe
• Beyond the Power Spectrum: A New Framework for Non-Stationary Fields with Applications to Light-Cone Effects in Line Intensity Mapping