Simulations of Galactic polarized synchrotron emission for Epoch of Reionization observations

Abstract

The detection of the redshifted cosmological $21$~cm line signal requires the removal of the Galactic and extragalactic foreground emission, which is orders of magnitude brighter anywhere in the sky. Foreground cleaning methods currently used are efficient in removing spectrally smooth components. However, they struggle in the presence of not spectrally smooth contamination that is, therefore, potentially the most dangerous one. An example of this is the polarized synchrotron emission, which is Faraday rotated by the interstellar medium and leaks into total intensity due to instrumental imperfections. In this work we present new full-sky simulations of this polarized synchrotron emission in the $50-200$~MHz range, obtained from the observed properties of diffuse polarized emission at low frequencies. The simulated polarized maps are made publicly available, aiming to provide more realistic templates to simulate the effect of instrumental leakage and the effectiveness of foreground separation techniques.

arXiv comment9 pages, 11 figures

References in corpus (49)

• Planck 2015 results. XIII. Cosmological parameters
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• MASTER of the CMB Anisotropy Power Spectrum: A Fast Method for Statistical Analysis of Large and Complex CMB Data Sets
• Faraday Rotation Measure Synthesis
• Hydrogen Epoch of Reionization Array (HERA)
• Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
• Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR
• 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
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• PAPER-64 Constraints on Reionization: The 21cm Power Spectrum at z=8.4
• An improved map of the Galactic Faraday sky
• The Epoch of Reionization Window: II. Statistical Methods for Foreground Wedge Reduction
• Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data
• Foregrounds for observations of the cosmological 21 cm line: I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field
• Coaxing Cosmic 21cm Fluctuations from the Polarized Sky using m-mode Analysis
• Radio polarization from the inner Galaxy at arcminute resolution
• First Season MWA EoR Power Spectrum Results at Redshift 7
• CMB mapping experiments: a designer's guide
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Polarization
• Realistic Simulations of the Galactic Polarized Foreground: Consequences for 21-cm Reionization Detection Experiments
• Empirical Covariance Modeling for 21 cm Power Spectrum Estimation: A Method Demonstration and New Limits from Early Murchison Widefield Array 128-Tile Data
• Bayesian constraints on the global 21-cm signal from the Cosmic Dawn
• First results on the Epoch of Reionization from First Light with SARAS 2
• Foregrounds for observations of the cosmological 21 cm line: II. Westerbork observations of the fields around 3C196 and the North Celestial Pole
• Results from EDGES High-Band: I. Constraints on Phenomenological Models for the Global $21$ cm Signal
• First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating
• Studying Galactic interstellar turbulence through fluctuations in synchrotron emission: First LOFAR Galactic foreground detection
• A 189 MHz, 2400 square degree polarization survey with the Murchison Widefield Array 32-element prototype
• Linear polarization structures in LOFAR observations of the interstellar medium in the 3C196 field
• Multi-redshift limits on the 21cm power spectrum from PAPER
• Initial LOFAR observations of Epoch of Reionization windows: II. Diffuse polarized emission in the ELAIS-N1 field
• Low frequency observations of linearly polarized structures in the interstellar medium near the south Galactic pole
• The Effects of Polarized Foregrounds on 21cm Epoch of Reionization Power Spectrum Measurements
• The GMRT EoR Experiment: Limits on Polarized Sky Brightness at 150 MHz
• Fast simulations for intensity mapping experiments
• WSRT Faraday tomography of the Galactic ISM at λ~ 0.86 m
• The impact of Galactic synchrotron emission on CMB anisotropy measurements. I. Angular power spectrum analysis of total intensity all-sky surveys
• Structure in the polarized Galactic synchrotron emission, in particular `depolarization canals'
• High Galactic latitude polarized emission at 1.4 GHz and implications for cosmic microwave background observations
• Polarised foreground removal at low radio frequencies using rotation measure synthesis: uncovering the signature of hydrogen reionisation
• The 21-cm Line as a Probe of Reionization
• Polarization leakage in epoch of reionization windows: II. Primary beam model and direction dependent calibration
• Constraining Polarized Foregrounds for EoR Experiments I: 2D Power Spectra from the PAPER-32 Imaging Array
• New Limits on Polarized Power Spectra at 126 and 164 MHz: Relevance to Epoch of Reionization Measurements
• Constraining Polarized Foregrounds for EOR Experiments II: Polarization Leakage Simulations in the Avoidance Scheme
• Exploring the Cosmic Reionization Epoch in Frequency Space: An Improved Approach to Remove the Foreground in 21 cm Tomography
• Polarization observations in a low synchrotron emission field at 1.4 GHz

Cited by in corpus (18)

• Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\mathbf{z}\approx 9.1$ from LOFAR
• SKAO HI Intensity Mapping: Blind Foreground Subtraction Challenge
• Recovery of 21 cm intensity maps with sparse component separation
• Hi intensity mapping with MeerKAT: Primary beam effects on foreground cleaning
• A tale of two sites -- II: Inferring the properties of minihalo-hosted galaxies with upcoming 21-cm interferometers
• On the contamination of the global 21~cm signal from polarized foregrounds
• 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
• Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz
• The bispectrum and 21cm foregrounds during the Epoch of Reionization
• Angular clustering of point sources at 150 MHz in the TGSS survey
• Constraints on the state of the IGM at $z\sim 8-10$ using redshifted 21-cm observations with LOFAR
• Contribution of Radio Halos to the Foreground for SKA EoR Experiments
• Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
• Contribution of Galactic free-free emission to the foreground for EoR signal in SKA experiments
• First upper limits on the 21-cm signal power spectrum of neutral hydrogen at $z=9.16$ from the LOFAR 3C196 field
• External Calibrator in Global Signal Experiment for Detection of the Epoch of Reionization
• Direct correlation of line intensity mapping and CMB lensing from evolution along the lightcone
• A Comprehensive Bayesian re-analysis of the SARAS2 data from the Epoch of Reionization