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Predictions for the 21 cm-galaxy cross-power spectrum observable with LOFAR and Subaru

Vrbanec, D; Ciardi, B; Jelic, V; Jensen, H; Zaroubi, S; Fernandez, ER; Ghosh, A; ... Mellema, G; + view all (2016) Predictions for the 21 cm-galaxy cross-power spectrum observable with LOFAR and Subaru. Monthly Notices of the Royal Astronomical Society , 457 (1) pp. 666-675. 10.1093/mnras/stv2993. Green open access

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Abstract

The 21 cm-galaxy cross-power spectrum is expected to be one of the promising probes of the Epoch of Reionization (EoR), as it could offer information about the progress of reionization and the typical scale of ionized regions at different redshifts. With upcoming observations of 21 cm emission from the EoR with the Low Frequency Array (LOFAR), and of high-redshift Ly α emitters with Subaru's Hyper Suprime-Cam (HSC), we investigate the observability of such cross-power spectrum with these two instruments, which are both planning to observe the ELAIS-N1 field at z = 6.6. In this paper, we use N-body + radiative transfer (both for continuum and Ly α photons) simulations at redshift 6.68, 7.06 and 7.3 to compute the 3D theoretical 21 cm-galaxy cross-power spectrum and cross-correlation function, as well as to predict the 2D 21 cm-galaxy cross-power spectrum and cross-correlation function expected to be observed by LOFAR and HSC. Once noise and projection effects are accounted for, our predictions of the 21 cm-galaxy cross-power spectrum show clear anti-correlation on scales larger than ∼60 h−1 Mpc (corresponding to k ∼ 0.1 h Mpc−1), with levels of significance p = 0.003 at z = 6.6 and p = 0.08 at z = 7.3. On smaller scales, instead, the signal is completely contaminated. On the other hand, our 21 cm-galaxy cross-correlation function is strongly contaminated by noise on all scales, since the noise is no longer being separated by its k modes.

Type: Article
Title: Predictions for the 21 cm-galaxy cross-power spectrum observable with LOFAR and Subaru
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stv2993
Publisher version: https://doi.org/10.1093/mnras/stv2993
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: high-redshift, intergalactic medium, cosmology: observations, LY-ALPHA EMITTERS, SIMULATING COSMIC REIONIZATION, LYMAN-BREAK GALAXIES, PROBING REIONIZATION, INTERGALACTIC MEDIUM, LARGE SCALES, Z-SIMILAR-TO-6 QUASARS, LUMINOSITY FUNCTIONS, 21-CM EPOCH, II EMISSION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10078645
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