The Hydrogen Epoch of Reionization Array Dish II: Characterization of Spectral Structure with Electromagnetic Simulations and its science Implications

Abstract

We use time-domain electromagnetic simulations to determine the spectral characteristics of the Hydrogen Epoch of Reionization Arrays (HERA) antenna. These simulations are part of a multi-faceted campaign to determine the effectiveness of the dish's design for obtaining a detection of redshifted 21 cm emission from the epoch of reionization. Our simulations show the existence of reflections between HERA's suspended feed and its parabolic dish reflector that fall below -40 dB at 150 ns and, for reasonable impedance matches, have a negligible impact on HERA's ability to constrain EoR parameters. It follows that despite the reflections they introduce, dishes are effective for increasing the sensitivity of EoR experiments at relatively low cost. We find that electromagnetic resonances in the HERA feed's cylindrical skirt, which is intended to reduce cross coupling and beam ellipticity, introduces significant power at large delays ($-40$ dB at 200 ns) which can lead to some loss of measurable Fourier modes and a modest reduction in sensitivity. Even in the presence of this structure, we find that the spectral response of the antenna is sufficiently smooth for delay filtering to contain foreground emission at line-of-sight wave numbers below $k_{\parallel }\lesssim 0.2$ $h$Mpc${}^{-1}$, in the region where the current PAPER experiment operates. Incorporating these results into a Fisher Matrix analysis, we find that the spectral structure observed in our simulations has only a small effect on the tight constraints HERA can achieve on parameters associated with the astrophysics of reionization.

arXiv commentAccepted to ApJ, 18 pages, 17 Figures. Replacement matches accepted manuscript

References in corpus (75)

• 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
• How small were the first cosmological objects?
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
• The Growth of HII Regions During Reionization
• The history of star formation in a LCDM universe
• Massloss of galaxies due to a UV-background
• A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
• Reionization and Cosmology with 21 cm Fluctuations
• Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization
• The Precision Array for Probing the Epoch of Reionization: 8 Station Results
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science goals, survey design and instrumentation
• How to measure CMB power spectra without losing information
• Cosmological Formation of Low-Mass Objects
• Bright Source Subtraction Requirements For Redshifted 21 cm Measurements
• 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
• ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz
• 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
• Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations
• The Epoch of Reionization Window: I. Mathematical Formalism
• New Limits on 21cm EoR From PAPER-32 Consistent with an X-Ray Heated IGM at z=7.7
• PAPER-64 Constraints on Reionization: The 21cm Power Spectrum at z=8.4
• 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
• The Evolution of Lyman Limit Absorption Systems to Redshift Six
• The Epoch of Reionization Window: II. Statistical Methods for Foreground Wedge Reduction
• A lower limit of dz > 0.06 for the duration of the reionization epoch
• A Sensitivity and Array-Configuration Study for Measuring the Power Spectrum of 21cm Emission from Reionization
• Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data
• Calibration Requirements for Detecting the 21 cm Epoch of Reionization Power Spectrum and Implications for the SKA
• Foregrounds for observations of the cosmological 21 cm line: I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• Inhomogeneous recombinations during cosmic reionization
• Opening the 21cm EoR Window: Measurements of Foreground Isolation with PAPER
• The Baryon Acoustic Oscillation Broadband and Broad-beam Array: Design Overview and Sensitivity Forecasts
• A study of fundamental limitations to statistical detection of redshifted HI from the epoch of reionization
• 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
• Observing Neutral Hydrogen Above Redshift 6: The "Global" Perspective
• Probing the First Stars and Black Holes in the Early Universe with the Dark Ages Radio Explorer (DARE)
• BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal
• Realistic Simulations of the Galactic Polarized Foreground: Consequences for 21-cm Reionization Detection Experiments
• Precision Calibration of Radio Interferometers Using Redundant Baselines
• Eliminating the optical depth nuisance from the CMB with 21 cm cosmology
• CHIPS: The Cosmological HI Power Spectrum Estimator
• Empirical Covariance Modeling for 21 cm Power Spectrum Estimation: A Method Demonstration and New Limits from Early Murchison Widefield Array 128-Tile Data
• Spectral Index of the Diffuse Radio Background Measured From 100 to 200 MHz
• First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating
• The kinetic Sunyaev-Zel'dovich signal from inhomogeneous reionization: a parameter space study
• Confirmation of Wide-Field Signatures in Redshifted 21 cm Power Spectra
• MITEoR: A Scalable Interferometer for Precision 21 cm Cosmology
• Calibration of Low-Frequency, Wide-Field Radio Interferometers Using Delay/Delay-Rate Filtering
• Foreground Model and Antenna Calibration Errors in the Measurement of the Sky-Averaged λ21 cm Signal at z~20
• PAPER-64 Constraints On Reionization II: The Temperature Of The z=8.4 Intergalactic Medium
• Multi-redshift limits on the 21cm power spectrum from PAPER
• UV Radiative Feedback During the Advanced Stages of Reionization
• The Effects of Polarized Foregrounds on 21cm Epoch of Reionization Power Spectrum Measurements
• Effects of Antenna Beam Chromaticity on Redshifted 21~cm Power Spectrum and Implications for Hydrogen Epoch of Reionization Array
• Variable and Transient Radio Sources in the FIRST Survey
• A Fast Method for Power Spectrum and Foreground Analysis for 21 cm Cosmology
• Constraining cosmology and ionization history with combined 21 cm power spectrum and global signal measurements
• Constraining High Redshift X-ray Sources with Next Generation 21 cm Power Spectrum Measurements
• SARAS measurement of the Radio Background at long wavelengths
• Measuring Phased-Array Antenna Beampatterns with High Dynamic Range for the Murchison Widefield Array using 137 MHz ORBCOMM Satellites
• Mapmaking for Precision 21 cm Cosmology
• Measuring the Cosmological 21 cm Monopole with an Interferometer
• A Technique for Primary Beam Calibration of Drift-Scanning, Wide-Field Antenna Elements
• On the detection of global 21-cm signal from Reionization using interferometers

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• Quantifying Excess Power from Radio Frequency Interference in Epoch of Reionization Measurements
• Design of the New Wideband Vivaldi Feed for the HERA Radio-Telescope Phase II
• Detecting Cosmic Reionization using Bi-Spectrum Phase
• Spectral performance of SKA Log-periodic Antennas I: Mitigating spectral artefacts in SKA1-LOW 21-cm cosmology experiments
• Detection of Cosmic Structures using the Bispectrum Phase. II. First Results from Application to Cosmic Reionization Using the Hydrogen Epoch of Reionization Array
• The HERA-19 Commissioning Array: Direction Dependent Effects
• Evidence of Ultra-faint Radio Frequency Interference in Deep 21~cm Epoch of Reionization Power Spectra with the Murchison Widefield Array
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• Quantifying EoR delay spectrum contamination from diffuse radio emission
• Antenna design for the SKA1-LOW and HERA super radio telescopes
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• Statistical Detection of IGM Structures during Cosmic Reionization using Absorption of the Redshifted 21 cm line by HI against Compact Background Radio Sources
• Validation Solutions to the Full-Sky Radio Interferometry Measurement Equation for Diffuse Emission
• Unlocking Sensitivity for Visibility-based Estimators of the 21 cm Reionization Power Spectrum
• Foreground and sensitivity analysis for broad band (2D) 21cm--Ly-alpha and 21cm--H-alpha correlation experiments probing the Epoch of Reionization
• Automated Detection of Antenna Malfunctions in Large-N Interferometers: A Case Study with the Hydrogen Epoch of Reionization Array
• Simulations of primary beam effects on the cosmic bispectrum phase observed with the Hydrogen Epoch of Reionization Array
• Synthetic Observations with the Square Kilometre Array (SKA) -- development towards an end-to-end pipeline
• Primary Beam Chromaticity in HIRAX: I. Characterization from Simulations and Power Spectrum Implications
• The impact of lunar topography on the 21-cm power spectrum for grid-based arrays : Insights for the Dark-ages EXplorer (DEX)