Topology of Reionisation times: concepts, measurements and comparisons to gaussian random field predictions
arXiv:2209.11608 · doi:10.1051/0004-6361/202244977
Abstract
In the next decade, radio telescopes like the Square Kilometer Array (SKA) will explore the Universe at high redshift, and particularly during the Epoch of Reionisation (EoR). The first structures emerged during this epoch, and their radiations have reionised the previously cold and neutral gas of the Universe creating ionised bubbles that percolate at the end of the EoR (at a redshift of approximately 6). SKA will produce 2D images of the distribution of the neutral gas at many redshifts, pushing us to develop tools and simulations to understand its properties. This paper aims at measuring topological statistics of the EoR in the "reionisation times" fields from both cosmological and semi-analytical simulations. This field informs us about the time of reionisation of the gas at each position, is used to probe the inhomogeneities of reionisation histories and can possibly be extracted from 21 cm maps. We also compare these measurements with analytical predictions from the gaussian random field (GRF) theory. The GRF theory allows us to compute many statistics of a field: PDFs of the field or its gradient, isocontour length, critical point distributions, and skeleton length. We compare these theoretical predictions to measurements made on reionisation time fields extracted from an EMMA and a 21cmFAST simulations at 1 a cMpc/h resolution. We also compared our results to GRFs generated from the fitted power spectra of the simulation maps. Both EMMA and 21cmFAST reionisation time fields (treion(r)) are close to be gaussian fields, in contrast with the 21 cm, density or ionisation fraction that are all proven to be non-gaussian. Only accelerating ionisation fronts at the end of the EoR seem to be a cause of small non-gaussianities in treion(r). Overall our results indicate that an analytical description of the reionisation percolation can be reasonably made within the framework of GRF theory.
arXiv comment22 pages, 20 figures, 3 tables. Accepted for publication in Astronomy & Astrophysics
References in corpus (74)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Array Programming with NumPy
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- Large-Scale Structure of the Universe and Cosmological Perturbation Theory
- In the Beginning: The First Sources of Light and the Reionization of the Universe
- 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
- The persistent cosmic web and its filamentary structure I: Theory and implementation
- Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization
- Efficient Simulations of Early Structure Formation and Reionization
- 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
- Simulating Cosmic Reionization at Large Scales I: the Geometry of Reionization
- What Next-Generation 21 cm Power Spectrum Measurements Can Teach Us About the Epoch of Reionization
- Reionization and the Cosmic Dawn with the Square Kilometre Array
- Simulations and Analytic Calculations of Bubble Growth During Hydrogen Reionization
- Large Lyman-alpha opacity fluctuations and low CMB tau in models of late reionization with large islands of neutral hydrogen extending to z<5.5
- Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
- 21CMMC: an MCMC analysis tool enabling astrophysical parameter studies of the cosmic 21 cm signal
- Minkowski Functionals used in the Morphological Analysis of Cosmic Microwave Background Anisotropy Maps
- Signatures of X-rays in the early Universe
- Comparison Of Reionization Models: Radiative Transfer Simulations And Approximate, Semi-Numeric Models
- Simulating Cosmic Reionization at Large Scales II: the 21-cm Emission Features and Statistical Signals
- Statistical Probes of Reionization With 21 cm Tomography
- Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
- A radiative transfer scheme for cosmological reionization based on a local Eddington tensor
- 21cmFAST v3: A Python-integrated C code forgenerating 3D realizations of the cosmic 21cm signal
- The Sensitivity of First Generation Epoch of Reionization Observatories and Their Potential for Differentiating Theoretical Power Spectra
- Imprint of Inhomogeneous Hydrogen Reionization on the Temperature Distribution of the Intergalactic Medium
- Quantifying the non-Gaussianity in the EoR 21-cm signal through bispectrum
- Emulating Simulations of Cosmic Dawn for 21cm Power Spectrum Constraints on Cosmology, Reionization, and X-ray Heating
- Reionization on Large Scales I: A Parametric Model Constructed from Radiation-Hydrodynamic Simulations
- Can 21-cm observations discriminate between high-mass and low-mass galaxies as reionization sources?
- Topology and Sizes of HII Regions during Cosmic Reionization
- Non-Gaussian statistics of critical sets in 2 and 3D: Peaks, voids, saddles, genus and skeleton
- The Local Theory of the Cosmic Skeleton
- Bubble size statistics during reionization from 21-cm tomography
- Optimal identification of HII regions during reionization in 21-cm observations
- The Distribution of Bubble Sizes During Reionization
- Constraining cosmology and ionization history with combined 21 cm power spectrum and global signal measurements
- The 21cm bispectrum during reionization: a tracer of the ionization topology
- The morphology of cosmological reionization by means of Minkowski Functionals
- The Large-Scale Observational Signatures of Low-Mass Galaxies During Reionization
- An Introductory Review on Cosmic Reionization
- The Topology of Cosmological Reionization
- The invariant joint distribution of a stationary random field and its derivatives: Euler characteristic and critical point counts in 2 and 3D
- EMMA: an AMR cosmological simulation code with radiative transfer
- Recovering the HII region size statistics from 21-cm tomography
- Measuring the topology of reionization with Betti numbers
- Studying topological structure in the epoch of reionization with 3D-Minkowski functionals of 21cm line fluctuations
- Evaluating the QSO contribution to the 21-cm signal from the Cosmic Dawn
- Impact of the reduced speed of light approximation on ionization front velocities in cosmological simulations of the epoch of reionization
- AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
- Neutral island statistics during reionization from 21-cm tomography
- The Inhomogeneous Reionization Times of Present-day Galaxies
- Deep learning approach for identification of HII regions during reionization in 21-cm observations
- Stages of Reionization as revealed by the Minkowski Functionals
- Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
- Prospects of constraining reionization model parameters using Minkowski tensors and Betti numbers
- Impact of the reduced speed of light approximation on the post-overlap neutral hydrogen fraction in numerical simulations of the epoch of reionization
- Morphology of 21cm brightness temperature during the Epoch of Reioinization using Contour Minkowski Tensor
- Measuring the History of Cosmic Reionization using the 21-cm PDF from Simulations
- A novel probe of bubble size statistics and time scales of the epoch of reionization using the contour Minkowski Tensor
- Inferring the properties of the sources of reionization using the morphological spectra of the ionized regions
- Weakly non-Gaussian formula for the Minkowski functionals in general dimensions
- Non Gaussian extrema counts for CMB maps
- Studying the morphology of reionisation with the triangle correlation function of phases
- The impact of non-Gaussianity on the Epoch of Reionization parameter forecast using 21-cm power spectrum measurements
- Quantifying Density-Ionization Correlations with the 21cm Power Spectrum
- Persistent topology of the reionization bubble network. II: Evolution & Classification
- Quantiles as Robust Probes of Non-Gaussianity in 21-cm Images
- Reionization time of the Local Group and Local-Group-like halo pairs
- Opening Reionization: Quantitative Morphology of the Epoch of Reionization and Its Connection to the Cosmic Density Field
- The Skeleton: Connecting Large Scale Structures to Galaxy Formation
- Distinguishing reionization models using the largest cluster statistics of the 21-cm maps
- Cosmic Reionization On Computers: Reionization Histories of Present-day Galaxies