Detectability of the 21 cm-CMB cross-correlation from the EoR

Abstract

The 21-cm line fluctuations and the cosmic microwave background (CMB) are powerful probes of the epoch of reionisation of the universe. We study the potential of the cross-correlation between 21-cm line fluctuations and CMB anisotropy to obtain further constraints on the reionisation history. We compute analytically the 21-cm cross-correlation with the CMB temperature anisotropy and polarisation, and we calculate the signal-to-noise (SN) ratio for its detection with Planck together with LOFAR, MWA and SKA. We find, on the one hand, that the 21-cm cross-correlation signal with CMB polarisation from the instant reionisation can be detected with an SN ratio of $\sim 1$ for LOFAR and $\sim 10$ for SKA. On the other hand, we confirm that the detection of the 21-cm cross-correlation with CMB polarisation is practically infeasible.

12 figures

References in corpus (13)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observational constraints on Cosmic Reionization
• Foreground simulations for the LOFAR - Epoch of Reionization Experiment
• The CMBR fluctuations from HI perturbations prior to reionization
• Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
• Probing Reionization with the 21 cm-Galaxy Cross Power Spectrum
• The Cross-Correlation of High-Redshift 21 cm and Galaxy Surveys
• The Cosmic Reionization History as Revealed by the CMB Doppler--21-cm Correlation
• The correlation between the distribution of galaxies and 21cm emission at high redshifts
• Reionization and the large-scale 21 cm-cosmic microwave background cross correlation
• Cross-correlation Study between the Cosmological 21-cm Signal and the kinetic Sunyaev-Zel'dovich effect
• Cross-correlation studies as a probe of reionization physics
• The cross-correlation of the CMB polarisation and the 21-cm line fluctuations from cosmic reionisation

Cited by in corpus (10)

• The Epoch of Reionization
• The Kinetic Sunyaev-Zel'dovich Effect from Reionization: Simulated Full Sky Maps at Arcminute Resolution
• Background reionization history from omniscopes
• Probing patchy reionization through tau-21cm correlation statistics
• Reconstructing large scales at cosmic dawn
• Exploring the cosmic dawn and epoch of reionization with 21cm line
• Constraining primordial non-Gaussianity with CMB-21cm cross-correlations?
• Detectability of the ${\tau }_{es}$-21cm cross-correlation: a tomographic probe of patchy reionization
• Study of systematics effects on the Cross Power Spectrum of 21 cm Line and Cosmic Microwave Background using Murchison Widefield Array Data
• Reionization and CMB non-Gaussianity