Towards $21$-cm intensity mapping at $z=2.28$ with uGMRT using the tapered gridded estimator II: Cross-polarization power spectrum

Abstract

Neutral hydrogen ($\mathrm{HI}$) $21$-cm intensity mapping (IM) offers an efficient technique for mapping the large-scale structures in the universe. We introduce the 'Cross' Tapered Gridded Estimator (Cross TGE), which cross-correlates two cross-polarizations (RR and LL) to estimate the multi-frequency angular power spectrum (MAPS) $C_{\ell }(\Delta \nu )$. We expect this to mitigate several effects like noise bias, calibration errors etc., which affect the 'Total' TGE which combines the two polarizations. Here we apply the Cross TGE on a $24.4\mathrm{MHz}$ bandwidth uGMRT Band $3$ data centred at $432.8\mathrm{MHz}$ aiming $\mathrm{HI}$ IM at $z=2.28$. The measured $C_{\ell }(\Delta \nu )$ is modelled to yield maximum likelihood estimates of the foregrounds and the spherical power spectrum $P(k)$ in several $k$ bins. Considering the mean squared brightness temperature fluctuations, we report a $2\sigma$ upper limit ${\Delta }_{UL}^2(k)\le (58.67{)}^2{\mathrm{mK}}^2$ at $k=0.804{\mathrm{Mpc}}^{-1}$ which is a factor of $5.2$ improvement on our previous estimate based on the Total TGE. Assuming that the $\mathrm{HI}$ traces the underlying matter distribution, we have modelled $C_{\ell }(\Delta \nu )$ to simultaneously estimate the foregrounds and $[{\Omega }_{\mathrm{HI}}{b}_{\mathrm{HI}}]$ where ${\Omega }_{\mathrm{HI}}$ and $b_{\mathrm{HI}}$ are the $\mathrm{HI}$ density and linear bias parameters respectively. We obtain a best fit value of $[{\Omega }_{\mathrm{HI}}{b}_{\mathrm{HI}}{]}^2=7.51\times 10^{-4}\pm 1.47\times 10^{-3}$ which is consistent with noise. Although the $2\sigma$ upper limit $[{\Omega }_{\mathrm{HI}}{b}_{\mathrm{HI}}{]}_{UL}\le 0.061$ is $\sim 50$ times larger than the expected value, this is a considerable improvement over earlier works at this redshift.

arXiv comment16 pages, 13 figures, accepted for publication in MNRAS

References in corpus (111)

• emcee: The MCMC Hammer
• Baryonic Features in the Matter Transfer Function
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• 21-cm cosmology
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• The DEEP2 Galaxy Redshift Survey: Design, Observations, Data Reduction, and Redshifts
• Reionization and Cosmology with 21 cm Fluctuations
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• 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
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9
• Late-time cosmology with 21cm intensity mapping experiments
• On the (Non)Evolution of HI Disks over Cosmic Time
• 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
• Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
• How accurately can 21 cm tomography constrain cosmology?
• The Epoch of Reionization Window: I. Mathematical Formalism
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• Determination of z~0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping auto-correlation
• Toward Epoch of Reionization Measurements with Wide-Field Radio Observations
• HI intensity mapping : a single dish approach
• Imaging the Epoch of Reionization: limitations from foreground confusion and imaging algorithms
• Resolving the Radio Source Background: Deeper Understanding Through Confusion
• Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
• Radio Foregrounds for the 21cm Tomography of the Neutral Intergalactic Medium at High Redshifts
• The Epoch of Reionization Window: II. Statistical Methods for Foreground Wedge Reduction
• The impact of point source subtraction residuals on 21 cm Epoch of Reionization estimation
• An Improved Model of Diffuse Galactic Radio Emission from 10 MHz to 5 THz
• 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
• The GMRT-EoR Experiment: A new upper limit on the neutral hydrogen power spectrum at z~8.6
• Foreground Contamination in Interferometric Measurements of the Redshifted 21 cm Power Spectrum
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• Opening the 21cm EoR Window: Measurements of Foreground Isolation with PAPER
• Foreground Removal using FastICA: A Showcase of LOFAR-EoR
• Lack of clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities
• The ESO UVES Advanced Data Products Quasar Sample - II. Cosmological Evolution of the Neutral Gas Mass Density
• A study of fundamental limitations to statistical detection of redshifted HI from the epoch of reionization
• On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
• The Tianlai project: a 21cm cosmology experiment
• Baryonic Acoustic Oscillations in 21cm Emission: A Probe of Dark Energy out to High Redshifts
• The Deep SWIRE Field I. 20cm Continuum Radio Observations: A Crowded Sky
• A Homogeneous Sample of Sub-DLAs III: Total Gas Mass Omega_(HI+HeII) at z>2
• Revisiting the radio interferometer measurement equation. II. Calibration and direction-dependent effects
• 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
• Statistical 21-cm Signal Separation via Gaussian Process Regression Analysis
• Foregrounds for redshifted 21 cm studies of reionization: GMRT 153 MHz observations
• Characterizing Foreground for redshifted 21-cm radiation: 150 MHz GMRT observations
• The multi-frequency angular power spectrum of the epoch of reionization 21 cm signal
• Using HI to probe large scale structures at z ~ 3
• The Angular Two-Point Correlation Function for the FIRST Radio Survey
• HI intensity mapping with MeerKAT: power spectrum detection in cross-correlation with WiggleZ galaxies
• HI constraints from the cross-correlation of eBOSS galaxies and Green Bank Telescope intensity maps
• HI as a Probe of the Large Scale Structure in the Post-Reionization Universe
• How well can we measure and understand foregrounds with 21 cm experiments?
• HI Fluctuations at Large Redshifts: I--Visibility correlation
• The Fundamental Multi-Baseline Mode-Mixing Foreground in 21 cm EoR Observations
• Calibration of Low-Frequency, Wide-Field Radio Interferometers Using Delay/Delay-Rate Filtering
• The Importance of Wide-field Foreground Removal for 21 cm Cosmology: A Demonstration With Early MWA Epoch of Reionization Observations
• The GMRT EoR Experiment: Limits on Polarized Sky Brightness at 150 MHz
• Effects of Antenna Beam Chromaticity on Redshifted 21~cm Power Spectrum and Implications for Hydrogen Epoch of Reionization Array
• The SDSS Damped Lya Survey: Data Release 1
• Improved foreground removal in GMRT 610 MHz observations towards redshifted 21-cm tomography
• Sources of the Radio Background Considered
• The angular power spectrum of NVSS radio galaxies
• A search for HI 21cm absorption in strong MgII absorbers in the redshift desert
• First Detection of Cosmic Structure in the 21-cm Intensity Field
• Theoretical and observational constraints on the HI intensity power spectrum
• Visibility based angular power spectrum estimation in low frequency radio interferometric observations
• Towards simulating and quantifying the light-cone EoR 21-cm signal
• Gaussian Process Foreground Subtraction and Power Spectrum Estimation for 21 cm Cosmology
• Spectral index properties of milliJansky radio sources
• Modelling the post-reionization neutral Hydrogen (\HI) bias
• GMRT observation towards detecting the Post-reionization 21-cm signal
• Estimation of Cosmological Parameters from HI Observations of Post-reionization Epoch
• Cosmological constraints from 21cm surveys after reionization
• GMRT observation of neutral atomic hydrogen gas in the COSMOS field at $z\sim 0.37$
• Modeling The Large Scale Bias of Neutral Hydrogen
• Polarized point sources in the LOFAR Two-meter Sky Survey: A preliminary catalog
• The visibility based Tapered Gridded Estimator (TGE) for the redshifted 21-cm power spectrum
• DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra
• Constraining large scale HI bias using redshifted 21-cm signal from the post-reionization epoch
• HI Fluctuations at Large Redshifts: III - Simulating the Signal Expected at GMRT
• Detailed study of ELAIS N1 field with the uGMRT -- II. Source Properties and Spectral Variation Of Foreground Power Spectrum from 300-500 MHz Observations
• The BINGO telescope: a new instrument exploring the new 21-cm cosmology window
• Tapering the sky response for angular power spectrum estimation from low-frequency radio-interferometric data
• Damped Lyman-alpha Absorbers from Sloan Digital Sky Survey DR16Q with Gaussian processes
• Demonstrating the Tapered Gridded Estimator (TGE) for the Cosmological HI 21-cm Power Spectrum using $150\mathrm{MHz}$ GMRT observations
• The Ooty Wide Field Array
• Prospects for detecting the 326.5 MHz redshifted 21 cm HI signal with the Ooty Radio Telescope (ORT)
• The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey
• A Tapered Gridded Estimator (TGE) for the Multi-Frequency Angular Power Spectrum (MAPS) and the Cosmological HI 21-cm Power Spectrum
• The clustering of sub-mJy radio sources in The Bootes Deep Field
• A method to determine the evolution history of the mean neutral Hydrogen fraction
• All sky angular power spectrum: I. Estimating brightness temperature fluctuations using TGSS 150 MHz survey
• First multi-redshift limits on post-Epoch of Reionization (post-EoR) 21 cm signal from z = 1.96 - 3.58 using uGMRT
• Exploring the evolution of Reionisation using a wavelet transform and the light cone effect
• Detailed study of the ELAIS N1 field with the uGMRT - I. Characterizing the 325 MHz foreground for redshifted 21 cm observations
• Characterizing EoR foregrounds: A study of the Lockman Hole Region at 325 MHz
• Primordial Non-Gaussianity in the Forest: 3D Bispectrum of Ly-alpha Flux Spectra Along Multiple Lines of Sight
• Statistical recovery of the BAO scale from multipoles of the beam-convolved 21cm correlation function
• Calibration Requirements for Epoch of Reionization 21-cm signal observations -- I. Effect of time-correlated gains
• Towards 21-cm Intensity Mapping at $z=2.28$ with uGMRT using the Tapered Gridded Estimator I: Foreground Avoidance
• The multi-frequency angular power spectrum in parameter studies of the cosmic 21-cm signal
• Multi-frequency angular power spectrum of the 21~cm signal from the Epoch of Reionisation using the Murchison Widefield Array
• Calibration requirements for Epoch of Reionization 21-cm signal observations -- II. Analytical estimation of the bias and variance with time-correlated residual gains
• A Comparative Analysis To Deal With Missing Spectral Information Caused By RFI In Cosmological HI 21CM Observations

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