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

Hiroyuki Tashiro*, Nabila Aghanim, Mathieu Langer, Marian Douspis, Saleem Zaroubi, Vibor Jelic

*Bijbehorende auteur voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

7 Citaten (Scopus)
217 Downloads (Pure)


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 100 mu K-2 at l similar to 3000. We also show that second-order terms may help in distinguishing between reionization histories.

Originele taal-2English
Pagina's (van-tot)3424-3433
Aantal pagina's10
TijdschriftMonthly Notices of the Royal Astronomical Society
Nummer van het tijdschrift4
StatusPublished - jul.-2011

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