Impact of Calibration and Position Errors on Astrophysical Parameters of the HI 21cm Signal

Abstract

The Epoch of Reionization (EoR) and Cosmic Dawn (CD) are pivotal stages during the first billion years of the universe, exerting a significant influence on the development of cosmic structure. The detection of the redshifted 21-cm signal from these epochs is challenging due to the dominance of significantly stronger astrophysical foregrounds and the presence of systematics. This work used the 21cm E2E (end to end) pipeline, followed by simulation methodology described \cite{2022Mazumder} to conduct synthetic observations of a simulated sky model that includes both the redshifted 21-cm signal and foregrounds. A framework was constructed using Artificial Neural Networks (ANN) and Bayesian techniques to directly deduce astrophysical parameters from the measured power spectrum. This approach eliminates the need for explicit telescope layout effects correction in interferometric arrays such as SKA-Low. The present work investigates the impact of gain calibration errors and sky model position errors on the recovery of the redshifted 21-cm power spectrum for the SKA-Low AA${}^{\ast }$ array configuration. We assessed the effects of these inaccuracies on the deduced astrophysical parameters and established acceptable tolerance levels. Based on our results, the gain calibration error tolerance for ideal signal detection is 0.001 \%. However, if the sky model position errors exceed 0.048 arcseconds, the remaining foregrounds would obscure the target signal.

arXiv comment27 pages, 7 figures, comments are welcome, Published in JCAP

References in corpus (86)

• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• 21-cm cosmology
• Observational constraints on Cosmic Reionization
• 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
• Reionization and Cosmology with 21 cm Fluctuations
• Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• Bright Source Subtraction Requirements For Redshifted 21 cm Measurements
• Reionization and the Cosmic Dawn with the Square Kilometre Array
• A Per-Baseline, Delay-Spectrum Technique for Accessing the 21cm Cosmic Reionization Signature
• Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations
• Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\mathbf{z}\approx 9.1$ from LOFAR
• Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• Distance measures in cosmology
• 21CMMC: an MCMC analysis tool enabling astrophysical parameter studies of the cosmic 21 cm signal
• Toward Epoch of Reionization Measurements with Wide-Field Radio Observations
• 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
• Calibration Requirements for Detecting the 21 cm Epoch of Reionization Power Spectrum and Implications for the SKA
• The GMRT-EoR Experiment: A new upper limit on the neutral hydrogen power spectrum at z~8.6
• Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
• Inhomogeneous recombinations during cosmic reionization
• Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems
• On Lyman-limit Systems and the Evolution of the Intergalactic Ionizing Background
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation
• Probing the Dark Ages at Z~20: The SCI-HI 21 cm All-Sky Spectrum Experiment
• Foregrounds in Wide-Field Redshifted 21 cm Power Spectra
• The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array
• The 21-cm signature of the first stars during the Lyman-Werner feedback era
• 21cmFAST v3: A Python-integrated C code forgenerating 3D realizations of the cosmic 21cm signal
• BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal
• Power Spectrum Sensitivity and the Design of Epoch of Reionization Observatories
• Realistic Simulations of the Galactic Polarized Foreground: Consequences for 21-cm Reionization Detection Experiments
• The Tiered Radio Extragalactic Continuum Simulation (T-RECS)
• Statistical 21-cm Signal Separation via Gaussian Process Regression Analysis
• The redshifted 21-cm signal in the EDGES low-band spectrum
• The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology
• The 21 centimeter emission from the reionization epoch: extended and point source foregrounds
• The Impact of Modeling Errors on Interferometer Calibration for 21 cm Power Spectra
• Deep learning from 21-cm tomography of the Cosmic Dawn and Reionization
• How does radiative feedback from a UV background impact reionization?
• HI Fluctuations at Large Redshifts: I--Visibility correlation
• Fundamental Limitations on the Calibration of Redundant 21 cm Cosmology Instruments and Implications for HERA and the SKA
• Confirmation of Wide-Field Signatures in Redshifted 21 cm Power Spectra
• Analysing the 21cm signal from the Epoch of Reionization with artificial neural networks
• Emulation of reionization simulations for Bayesian inference of astrophysics parameters using neural networks
• Characterisation of the ionosphere above the Murchison Radio Observatory using the Murchison Widefield Array
• Mitigating Internal Instrument Coupling for 21 cm Cosmology I: Temporal and Spectral Modeling in Simulations
• Redundant Array Configurations for 21 cm Cosmology
• Emulating the Global 21-cm Signal from Cosmic Dawn and Reionization
• Understanding the Diversity of 21 cm Cosmology Analyses
• Spectral calibration requirements of radio interferometers for Epoch of Reionisation science with the SKA
• Comparing Foreground Removal Techniques for Recovery of the LOFAR-EoR 21cm Power Spectrum
• Comparing Redundant and Sky Model Based Interferometric Calibration: A First Look with Phase II of the MWA
• Evaluating machine learning techniques for predicting power spectra from reionization simulations
• Identifying Reionization Sources from 21cm Maps using Convolutional Neural Networks
• GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
• Polarized Redundant-Baseline Calibration for 21 cm Cosmology Without Adding Spectral Structure
• 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
• Detailed study of ELAIS N1 field with the uGMRT -- II. Source Properties and Spectral Variation Of Foreground Power Spectrum from 300-500 MHz Observations
• A deep learning model to emulate simulations of cosmic reionization
• A Unified Calibration Framework for 21 cm Cosmology
• Improving constraints on the reionization parameters using 21-cm bispectrum
• Detection of Signals from Cosmic Reionization using Radio Interferometric Signal Processing
• 21cmVAE: A Very Accurate Emulator of the 21-cm Global Signal
• 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
• The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey
• Spectral performance of SKA Log-periodic Antennas I: Mitigating spectral artefacts in SKA1-LOW 21-cm cosmology experiments
• Extracting the 21-cm Power Spectrum and the reionization parameters from mock datasets using Artificial Neural Networks
• Characterizing EoR foregrounds: A study of the Lockman Hole Region at 325 MHz
• Observing the Reionization : Effect of Calibration and Position Errors on Realistic Observation Conditions
• Using Artificial Neural Networks to extract the 21-cm Global Signal from the EDGES data
• Spectral performance of Square Kilometre Array Antennas II: Calibration performance
• Calibration Requirements for Epoch of Reionization 21-cm signal observations -- I. Effect of time-correlated gains
• Extracting the Global 21-cm signal from Cosmic Dawn and Epoch of Reionization in the presence of Foreground and Ionosphere
• 21cm Global Signal Extraction: Extracting the 21cm Global Signal using Artificial Neural Networks
• Comparing sampling techniques to chart parameter space of 21 cm Global signal with Artificial Neural Networks
• Ionospheric effect on the synthetic Epoch of Reionization observations with the SKA1-Low

Cited by in corpus (1)

• Mitigating gain calibration errors from EoR observations with SKA1-Low AA*