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

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

2009-08-12

arxiv.org/abs/0908.1632v2

2010, MNRAS, 402, 2617

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 figures

Scientific paper

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.

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