Testing synchrotron models and frequency resolution in BINGO 21 cm simulated maps using GNILC

Abstract

To recover the 21 cm hydrogen line, it is essential to separate the cosmological signal from the much stronger foreground contributions at radio frequencies. The BINGO radio telescope is designed to measure the 21 cm line and detect BAOs using the intensity mapping technique. This work analyses the performance of the GNILC method, combined with a power spectrum debiasing procedure. The method was applied to a simulated BINGO mission, building upon previous work from the collaboration. It compares two different synchrotron emission models and different instrumental configurations, in addition to the combination with ancillary data to optimize both the foreground removal and recovery of the 21 cm signal across the full BINGO frequency band, as well as to determine an optimal number of frequency bands for the signal recovery. We have produced foreground emissions maps using the Planck Sky Model, the cosmological Hi emission maps are generated using the FLASK package and thermal noise maps are created according to the instrumental setup. We apply the GNILC method to the simulated sky maps to separate the Hi plus thermal noise contribution and, through a debiasing procedure, recover an estimate of the noiseless 21 cm power spectrum. We found a near optimal reconstruction of the Hi signal using a 80 bins configuration, which resulted in a power spectrum reconstruction average error over all frequencies of 3%. Furthermore, our tests showed that GNILC is robust against different synchrotron emission models. Finally, adding an extra channel with CBASS foregrounds information, we reduced the estimation error of the 21 cm signal. The optimisation of our previous work, producing a configuration with an optimal number of channels for binning the data, impacts greatly the decisions regarding BINGO hardware configuration before commissioning.

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References in corpus (41)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• A high resolution foreground cleaned CMB map from WMAP
• A unified pseudo-$C_{\ell }$ framework
• A method for subtracting foregrounds from multi-frequency CMB sky maps
• Joint Bayesian component separation and CMB power spectrum estimation
• A full sky, low foreground, high resolution CMB map from WMAP
• On Foreground Removal from the Wilkinson Microwave Anisotropy Probe Data by an Internal Linear Combination Method: Limitations and Implications
• The pre-launch Planck Sky Model: a model of sky emission at submillimetre to centimetre wavelengths
• Global, Exact Cosmic Microwave Background Data Analysis Using Gibbs Sampling
• Separation of anomalous and synchrotron emissions using WMAP polarization data
• Multi-Detector Multi-Component spectral matching and applications for CMB data analysis
• CMB and SZ effect separation with Constrained Internal Linear Combinations
• Improving lognormal models for cosmological fields
• All-sky astrophysical component separation with Fast Independent Component Analysis (FastICA)
• Foreground component separation with generalised ILC
• Blind foreground subtraction for intensity mapping experiments
• Application of Monte Carlo Algorithms to the Bayesian Analysis of the Cosmic Microwave Background
• Towards a model of full-sky Galactic synchrotron intensity and linear polarisation: a re-analysis of the Parkes data
• A needlet ILC analysis of WMAP 7-year data: estimation of CMB temperature map and power spectrum
• Non-parametric foreground subtraction for 21cm epoch of reionization experiments
• The effect of foreground subtraction on cosmological measurements from Intensity Mapping
• Estimation of Polarized Power Spectra by Gibbs sampling
• Erasing the Milky Way: new cleaning technique applied to GBT intensity mapping data
• Extracting HI cosmological signal with Generalized Needlet Internal Linear Combination
• A needlet ILC analysis of WMAP 9-year polarisation data: CMB polarisation power spectra
• Cosmological Measurements from Angular Power Spectra Analysis of BOSS DR12 Tomography
• The BINGO Project I: Baryon Acoustic Oscillations from Integrated Neutral Gas Observations
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• Measuring the tensor to scalar ratio from CMB B-modes in presence of foregrounds
• Wiener Filtering of the COBE DMR Data
• A blind estimation of the power spectrum of CMB anisotropy from WMAP
• CMB and foregrounds in WMAP first year data
• Extracting cosmic microwave background polarisation from satellite astrophysical maps
• Astrophysical components separation of COBE-DMR 4yr data with FastICA
• The BINGO Project II: Instrument Description
• The BINGO Project V: Further steps in Component Separation and Bispectrum Analysis
• A Joint Analysis for Cosmology and Photometric Redshift Calculation Using Cross Correlations
• The BINGO Project IV: Simulations for mission performance assessment and preliminary component separation steps
• Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing
• Baryon acoustic oscillations from Integrated Neutral Gas Observations: Radio frequency interference measurements and telescope site selection

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