Detectability of the 21-cm CMB cross-correlation from the epoch of reionization

作者：Tashiro Hiroyuki^*; Aghanim Nabila; Langer Mathieu; Douspis Marian; Zaroubi Saleem; Jelic Vibor

来源：Monthly Notices of the Royal Astronomical Society, 2010, 402(4): 2617-2625.

DOI：10.1111/j.1365-2966.2009.16078.x

• cosmic microwave background
• cosmology: theory
• large-scale structure of Universe

The 21-cm line fluctuations and the cosmic microwave background (CMB) are powerful probes of the epoch of reionization 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 reionization history. We analytically compute the 21-cm cross-correlation with the CMB temperature anisotropy and polarization, and we calculate the signal-to-noise ratio (S/N) for its detection with Planck together with LOw Frequency ARray (LOFAR), Murchison Widefield Array (MWA) and Square Kilometer Array (SKA). We find, on the one hand, that the 21-cm cross-correlation signal with CMB temperature from the instant reionization can be detected with an S/N of similar to 2 for LOFAR and similar to 10 for SKA. On the other hand, we confirm that the detection of the 21-cm cross-correlation with CMB polarization is practically infeasible.

• 出版日期2010-3