Field-level Reconstruction from Foreground-Contaminated 21-cm Maps

Abstract

Current and upcoming 21-cm experiments will soon be able to map 21-cm spatial fluctuations in three dimensions for a wide range of redshifts. However, bright foreground contamination and the nature of radio interferometry create significant challenges, making it difficult to access rich cosmological information from the Fourier modes that lie within the "foreground wedge". In this work, we introduce two approaches aiming to reconstruct the full 21-cm density field, including the missing modes in the wedge: (a) a field-level inference under an effective field theory (EFT) framework; (b) a diffusion-based deep generative model trained on simulations. Under the EFT framework, we implement a fully differentiable forward model that maps the initial conditions of matter fluctuations to the observed, foreground-filtered 21-cm maps. This enables a gradient-based sampler to simultaneously sample the initial conditions and bias parameters, allowing a physically motivated mode reconstruction. Alternatively, we apply a variational diffusion model to perform 21-cm density reconstruction at the map level. Our model is trained on semi-numerical simulations over a wide range of astrophysical parameters. Our results from both approaches should provide improved cosmological constraints from the field level and also enable cross-correlation between experiments that have little or no overlapping modes.

37 pages, 9 figures; Replaced to match accepted JCAP version. New version contains small editorial changes throughout in response to referee comments, no changes to results

References in corpus (102)

• LOFAR: The LOw-Frequency ARray
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• 21-cm cosmology
• 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
• Hydrogen Epoch of Reionization Array (HERA)
• The Growth of HII Regions During Reionization
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
• Reionization and Cosmology with 21 cm Fluctuations
• The Precision Array for Probing the Epoch of Reionization: 8 Station Results
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• Bright Source Subtraction Requirements For Redshifted 21 cm Measurements
• Late-time cosmology with 21cm intensity mapping experiments
• A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment
• A Per-Baseline, Delay-Spectrum Technique for Accessing the 21cm Cosmic Reionization Signature
• Bayesian physical reconstruction of initial conditions from large scale structure surveys
• Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations
• The Epoch of Reionization Window: I. Mathematical Formalism
• Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal
• Correcting for the alias effect when measuring the power spectrum using FFT
• The Phase II Murchison Widefield Array: Design Overview
• Imaging the Epoch of Reionization: limitations from foreground confusion and imaging algorithms
• Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
• The impact of point source subtraction residuals on 21 cm Epoch of Reionization estimation
• First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum
• An Improved Model of Diffuse Galactic Radio Emission from 10 MHz to 5 THz
• Calibration Requirements for Detecting the 21 cm Epoch of Reionization Power Spectrum and Implications for the SKA
• Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• Foreground Removal using FastICA: A Showcase of LOFAR-EoR
• A study of fundamental limitations to statistical detection of redshifted HI from the epoch of reionization
• The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field I: Hamiltonian Markov Chain Monte Carlo Method with Particle Mesh Dynamics
• Physical Bayesian modelling of the non-linear matter distribution: new insights into the Nearby Universe
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• Statistical 21-cm Signal Separation via Gaussian Process Regression Analysis
• The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA
• Past and present cosmic structure in the SDSS DR7 main sample
• The Impact of Modeling Errors on Interferometer Calibration for 21 cm Power Spectra
• Systematic biases in low frequency radio interferometric data due to calibration: the LOFAR EoR case
• The Initial Conditions of the Universe from Constrained Simulations
• First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating
• Accurate initial conditions for cosmological N-body simulations: Minimizing truncation and discreteness errors
• Fundamental Limitations on the Calibration of Redundant 21 cm Cosmology Instruments and Implications for HERA and the SKA
• The Fundamental Multi-Baseline Mode-Mixing Foreground in 21 cm EoR Observations
• LRP 2020 Whitepaper: The Canadian Hydrogen Observatory and Radio-transient Detector (CHORD)
• Near optimal bispectrum estimators for large-scale structure
• Mitigating Internal Instrument Coupling for 21 cm Cosmology I: Temporal and Spectral Modeling in Simulations
• Cosmological Reconstruction From Galaxy Light: Neural Network Based Light-Matter Connection
• A rigorous EFT-based forward model for large-scale structure
• Mitigating the Effects of Antenna-to-Antenna Variation on Redundant-Baseline Calibration for 21 cm Cosmology
• deep21: a Deep Learning Method for 21cm Foreground Removal
• Bayesian inference of cosmic density fields from non-linear, scale-dependent, and stochastic biased tracers
• Reconstructing large-scale structure with neutral hydrogen surveys
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey II: Galactic Plane $345^{\circ }<l<67^{\circ }$, $180^{\circ }<l<240^{\circ }$
• Gaussian Process Foreground Subtraction and Power Spectrum Estimation for 21 cm Cosmology
• How much information can be extracted from galaxy clustering at the field level?
• Translation and Rotation Equivariant Normalizing Flow (TRENF) for Optimal Cosmological Analysis
• Recovering the Wedge Modes Lost to 21-cm Foregrounds
• DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra
• Capturing Non-Gaussianity of the Large-Scale Structure with Weighted Skew-Spectra
• Cosmology Inference from Biased Tracers using the EFT-based Likelihood
• Exploring 21cm - Lyman Alpha emitter synergies for SKA
• Separating the EoR Signal with a Convolutional Denoising Autoencoder: A Deep-learning-based Method
• The Bias and Uncertainty of Redundant and Sky-Based Calibration under Realistic Sky and Telescope Conditions
• The observable 21cm signal from reionization may be perturbative
• Quantifying Suppression of the Cosmological 21-cm Signal due to Direction Dependent Gain Calibration in Radio Interferometers
• The EFT Likelihood for Large-Scale Structure
• Consistency tests of field level inference with the EFT likelihood
• Patterns of primary beam non-redundancy in close-packed 21 cm array observations
• Sigma-Eight at the Percent Level: The EFT Likelihood in Real Space
• Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning
• Calibration and 21-cm Power Spectrum Estimation in the Presence of Antenna Beam Variations
• Array Element Coupling in Radio Interferometry I: A Semi-Analytic Approach
• A Parameter-Masked Mock Data Challenge for Beyond-Two-Point Galaxy Clustering Statistics
• On the accuracy and precision of correlation functions and field-level inference in cosmology
• Deeper multi-redshift upper limits on the Epoch of Reionization 21-cm signal power spectrum from LOFAR between z=8.3 and z=10.1
• Neural physical engines for inferring the halo mass distribution function
• The Likelihood for LSS: Stochasticity of Bias Coefficients at All Orders
• Bayesian Inference of Initial Conditions from Non-Linear Cosmic Structures using Field-Level Emulators
• The Clustering of Galaxies in the Completed SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmic Flows and Cosmic Web from Luminous Red Galaxies
• Noise Temperature of Phased Array Radio Telescope: The Murchison Widefield Array and the Engineering Development Array
• Deep learning approach for identification of HII regions during reionization in 21-cm observations -- II. foreground contamination
• A Bayesian analysis of redshifted 21-cm HI signal and foregrounds: Simulations for LOFAR
• An Effective Bias Expansion for 21 cm Cosmology in Redshift Space
• The Impact of Beam Variations on Power Spectrum Estimation for 21-cm Cosmology I: Simulations of Foreground Contamination for HERA
• Optimal survey parameters: Ly$\alpha$ and H$\alpha$ intensity mapping for synergy with the 21cm signal during reionization
• Density reconstruction from biased tracers and its application to primordial non-Gaussianity
• Prospects for 21cm-Galaxy Cross-Correlations with HERA and the Roman High-Latitude Survey
• The EFT Likelihood for Large-Scale Structure in Redshift Space
• Beamforming Errors in Murchison Widefield Array Phased Array Antennas and their effects on Epoch of Reionization Science
• Lagrangian approach to super-sample effects on biased tracers at field level: galaxy density fields and intrinsic alignments
• Machine-learning recovery of foreground wedge-removed 21-cm light cones for high-$z$ galaxy mapping
• Reconstructing the Universe with Variational self-Boosted Sampling
• Estimating the Feasibility of 21cm-Ly$\alpha$ Synergies using the Hydrogen Epoch of Reionization Array
• Detecting galaxy-21-cm cross-correlation during reionization
• Constraining the 21cm brightness temperature of the IGM at $z$=6.6 around LAEs with the Murchison Widefield Array
• First upper limits on the 21-cm signal power spectrum of neutral hydrogen at $z=9.16$ from the LOFAR 3C196 field
• Stacking Redshifted 21cm Images of HII Regions Around High Redshift Galaxies as a Probe of Early Reionization
• A Differentiable, End-to-End Forward Model for 21 cm Cosmology: Estimating the Foreground, Instrument, and Signal Joint Posterior
• Reconstructing the Long-wavelength Matter Density Fluctuation Modes from the Scalar-Type Clustering Fossils

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