TY - JOUR

T1 - Second order cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm fluctuations from the epoch of reionization

AU - Tashiro, Hiroyuki

AU - Aghanim, Nabila

AU - Langer, Mathieu

AU - Douspis, Marian

AU - Zaroubi, Saleem

AU - Jelić, Vibor

PY - 2011/7

Y1 - 2011/7

N2 - 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.

AB - 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.

KW - Cosmology: theory

KW - Large-scale structure of Universe

UR - http://www.scopus.com/inward/record.url?scp=79959847235&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2011.18644.x

DO - 10.1111/j.1365-2966.2011.18644.x

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AN - SCOPUS:79959847235

SN - 0035-8711

VL - 414

SP - 3424

EP - 3433

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -