http://arxiv.org/abs/1906.10863
We study statistics of the 21-cm signal from the epoch of reionisation. We propose to use [OIII] line emitting galaxies to cross-correlate with the 21-cm signal from $z = 7 – 10$. To this aim, we employ simulations of reionisation obtained post-processing the high-resolution cosmological hydrodynamics simulation Massive Black-II with the 3D radiative transfer code CRASH to follow the propagation of ionising photons from a variety of sources. We show that, during the early phases of reionisation, the 21-cm signal is positively correlated with the spatial distribution of the [OIII] emitters on large scales $(k < 1h~\rm cMpc^{-1})$. This positive correlation is generated by the temperature – galaxy correlation and it is a few times larger than when we assume that the heating is saturated. As the reionised regions expand, the correlation changes its sign to negative from $z = 10$ to 8. The signals at this epoch can be detected by combining the Square Kilometre Array (SKA) and a wide-field [OIII] emitter survey. We also calculate the cross-power spectrum with a three-dimensional [OIII] intensity field, aiming at exploiting future intensity mapping observations. We conclude that high-redshift [OIII] line emitters provide a promising and unique method to probe the reionisation process when the inter-galactic medium is largely neutral.
K. Moriwaki, N. Yoshida, M. Eide, et. al.
Thu, 27 Jun 19
33/62
Comments: 7 pages, 5 figures, submitted to MNRAS
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