Tashiro, Hiroyuki
[UCL]
Aghanim, Nabila
Langer, Mathieu
Douspis, Marian
Zaroubi, Saleem
Jelić, Vibor
The measurement of the brightness temperature fluctuations of neutral hydrogen 21-cm lines from the epoch of reionization (EoR) is expected to be a powerful tool for revealing the reionization process. We study the 21-cm cross-correlation with cosmic microwave background (CMB) temperature anisotropies, focusing on the effect of the patchy reionization. We calculate, up to second order, the angular power spectrum of the cross-correlation between 21-cm fluctuations and the CMB kinetic Sunyaev-Zel'dovich effect (kSZ) from the EoR, using an analytical reionization model. We show that the kSZ and the 21-cm fluctuations are anti-correlated on the scale corresponding to the typical size of an ionized bubble at the observed redshift of the 21-cm fluctuations. The amplitude of the angular power spectrum of the cross-correlation depends on the fluctuations of the ionized fraction. Especially, in a highly inhomogeneous reionization model, the amplitude reaches the order of 100μ K2 at ℓ∼ 3000. We also show that second-order terms may help in distinguishing between reionization histories. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Bibliographic reference |
Tashiro, Hiroyuki ; Aghanim, Nabila ; Langer, Mathieu ; Douspis, Marian ; Zaroubi, Saleem ; et. al. Second order cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm fluctuations from the epoch of reionization. In: Monthly Notices of the Royal Astronomical Society, Vol. 414, no. 4, p. 3424-3433 (2011) |
Permanent URL |
http://hdl.handle.net/2078.1/163430 |