@article{f345ad64dcc4481a916cc7dc4ee91ad6,
title = "Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys",
abstract = "In this paper, we use radiative transfer+N-body simulations to explore the feasibility of measurements of cross-correlations between the 21-cm field observed by the Square Kilometre Array (SKA) and high-z Lyman α emitters (LAEs) detected in galaxy surveys with the Subaru Hyper Suprime-Cam (HSC), Subaru Prime Focus Spectrograph (PFS), and Wide Field Infrared Survey Telescope (WFIRST). 21cm–LAE cross-correlations are in fact a powerful probe of the epoch of reionization as they are expected to provide precious information on the progress of reionization and the typical scale of ionized regions at different redshifts. The next generation observations with SKA will have a noise level much lower than those with its precursor radio facilities, introducing a significant improvement in the measurement of the cross-correlations. We find that an SKA-HSC/PFS observation will allow to investigate scales below ∼10 and ∼60 h −1 Mpc at z = 7.3 and 6.6, respectively. WFIRST will allow to access also higher redshifts, as it is expected to observe spectroscopically ∼900 LAEs per deg 2 and unit redshift in the range 7.5 ≤ z ≤ 8.5. Because of the reduction of the shot noise compared to HSC and PFS, observations with WFIRST will result in more precise cross-correlations and increased observable scales. ",
keywords = "galaxies: high-redshift, intergalactic medium, dark ages, reionization, first stars, cosmology: observations, SIMULATING COSMIC REIONIZATION, 21 CM FOREST, HIGH-REDSHIFT, INTERGALACTIC MEDIUM, LARGE SCALES, EPOCH, SIGNAL, LOFAR, TEMPERATURE, EMISSION",
author = "Dijana Vrbanec and Benedetta Ciardi and Vibor Jelic and Hannes Jensen and Iliev, {Ilian T.} and Garrelt Mellema and Saleem Zaroubi",
note = "Funding Information: The authors would like to thank an anonymous referee for useful comments. The authors acknowledge Paul Shapiro for permission to use the simulations on which this paper was based, described in Iliev et al. (2014). That work was supported in part by grants and allocations of which Shapiro is the P.I., including US NSF grant AST-1009799, NASA grant NNX11AE09G, NASA/JPL grant RSA Nos 1492788 and 1515294, and supercomputer resources from NSF XSEDE grant TG-AST090005 and the Texas Advanced Computing Center (TACC) at the University of Texas at Austin. Some of the numerical computations were done on the Apollo cluster at The University of Sussex and the Sciama High Performance Compute (HPC) cluster that is supported by the ICG, SEPNet, and the University of Portsmouth. Parts of the computations were performed on the GPC supercomputer at the SciNet HPC Consortium (courtesy Ue-Li Pen). SciNet is funded by: the Canada Foundation for Innovation under the auspices of Compute Canada; the Government of Ontario; Ontario Research Fund − Research Excellence; and the University of Toronto. The authors thank Kyungjin Ahn for providing the recipe for including subresolution sources in the simulation volume. Publisher Copyright: {\textcopyright} The Author(s) 2020.",
year = "2020",
month = mar,
doi = "10.1093/mnras/staa183",
language = "English",
volume = "492",
pages = "4952--4958",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",
}