The CMBR ISW and HI 21-cm Cross-correlation Angular Power Spectrum

Abstract

The late-time growth of large scale structures (LSS) is imprinted in the CMBR anisotropy through the Integrated Sachs Wolfe (ISW) effect. This is perceived to be a very important observational probe of dark energy. Future observations of redshifted 21-cm radiation from the cosmological neutral hydrogen (HI) distribution hold the potential of probing the LSS over a large redshift range. We have investigated the possibility of detecting the ISW through cross-correlations between the CMBR anisotropies and redshifted 21-cm observations. Assuming that the HI traces the dark matter, we find that the ISW-HI cross-correlation angular power spectrum at an angular multipole l is proportional to the dark matter power spectrum evaluated at the comoving wave number l/r, where r is the comoving distance to the redshift from which the HI signal originated. The amplitude of the cross-correlation signal depends on parameters related to the HI distribution and the growth of cosmological perturbations. However the cross-correlation is extremely weak as compared to the CMBR anisotropies and the predicted HI signal. As a consequence the cross-correlation signal is smaller than the cosmic variance, and a statistically significant detection is not very likely.

13 pages, 4 eps figures, submitted

References in corpus (44)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The Cosmological Constant and Dark Energy
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological parameters from SDSS and WMAP
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• The Large Scale Structure of f(R) Gravity
• Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• A correlation of the cosmic microwave sky with large scale structure
• Correlation of CMB with large-scale structure: I. ISW Tomography and Cosmological Implications
• Distinguishing Modified Gravity from Dark Energy
• Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
• Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications
• The evolution of Omega(HI) and the epoch of formation of damped Lyman-alpha absorbers
• Cross-Correlation of the Cosmic Microwave Background with the 2MASS Galaxy Survey: Signatures of Dark Energy, Hot Gas, and Point Sources
• The CMBR fluctuations from HI perturbations prior to reionization
• Evolution of Neutral Gas at High Redshift -- Implications for the Epoch of Galaxy Formation
• A high redshift detection of the integrated Sachs-Wolfe effect
• The 21cm angular-power spectrum from the dark ages
• The Wilkinson Microwave Anisotropy Probe (WMAP) Source Catalog
• Probing Reionization with the 21 cm-Galaxy Cross Power Spectrum
• Foregrounds for redshifted 21 cm studies of reionization: GMRT 153 MHz observations
• The multi-frequency angular power spectrum of the epoch of reionization 21 cm signal
• Correlating the CMB with Luminous Red Galaxies : The Integrated Sachs-Wolfe Effect
• Using HI to probe large scale structures at z ~ 3
• Next Generation Redshift Surveys and the Origin of Cosmic Acceleration
• HI Fluctuations at Large Redshifts: I--Visibility correlation
• The integrated Sachs-Wolfe Effect -- Large Scale Structure Correlation
• The 21cm Power Spectrum After Reionization
• The Cosmic Reionization History as Revealed by the CMB Doppler--21-cm Correlation
• Physical Evidence for Dark Energy
• Estimation of Cosmological Parameters from HI Observations of Post-reionization Epoch
• Reionization and the large-scale 21 cm-cosmic microwave background cross correlation
• Lecture Notes on CMB Theory: From Nucleosynthesis to Recombination
• Constraining the Nature of Dark Energy using the SKA
• Cosmological Perturbation Theory and Structure Formation
• Cross-correlation studies as a probe of reionization physics
• The effect of reionization on the CMB-density correlation
• Using Gravitational Lensing to study HI clouds at high redshift
• The Physics of CMBR Anisotropies
• The Wilkinson Microwave Anisotropy Probe

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• CMBR Weak Lensing and HI 21-cm Cross-correlation Angular Power Spectrum
• The redshifted HI 21 cm signal from the post-reionization epoch: Cross-correlations with other cosmological probes
• Cross-correlation analysis of CMB with foregrounds for residuals
• Probing Quintessence using BAO imprint on the cross-correlation of weak lensing and post-reionization HI 21 cm signal
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