Second order cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm fluctuations from the epoch of reionization
(2011) Monthly Notices of the Royal Astronomical Society — Vol. 414, n° 4, p. 3424-3433 (2011)
Files
pdfdocument.pdf
Restricted Access - Adobe PDF
- 908.65 KB
Details
- Authors
- Abstract
- 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 K<sup>2</sup> 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.
- Affiliations
Citations
Tashiro, H., Aghanim, N., Langer, M., Douspis, M., Zaroubi, S., & Jelić, V. (2011). Second order cross-correlation between kinetic Sunyaev-Zel’dovich effect and 21-cm fluctuations from the epoch of reionization. Monthly Notices of the Royal Astronomical Society, 414(4), 3424-3433. https://doi.org/10.1111/j.1365-2966.2011.18644.x (Original work published 2011)