Detectability of 21cm signal during the Epoch of Reionization with 21cm-Lyman-$\alpha$ emitter cross-correlation. III. Model dependence

Abstract

Detecting ${\mathrm{H}}_{\mathrm{I}}$ 21cm line in the intergalactic medium (IGM) during the Epoch of Reionization (EoR) suffers from foreground contamination such as Galactic synchrotron and extragalactic radio sources. Cross-correlation between the 21cm line and Lyman-$\alpha$ emitter (LAE) galaxies is a powerful tool to identify the 21cm signal since the 21cm line emission has correlation with LAEs while the LAEs are statistically independent of the foregrounds. So far, the detectability of 21cm-LAE cross-power spectrum has been investigated with simple LAE models where the observed Ly$\alpha$ luminosity is proportional to the dark matter halo mass. However, the previous models were inconsistent with the latest observational data of LAEs obtained with Subaru/Hyper Suprime-Cam (HSC). Here, we revisit the detectability of 21cm-LAE cross-power spectrum adopting a state-of-the-art LAE model consistent with all Subaru/HSC observations such as the Ly$\alpha$ luminosity function, LAE angular auto-correlation, and the LAE fractions in the continuum selected galaxies. We find that resultant cross-power spectrum with the updated LAE model is reduced at small scales ($k\sim 1\mathrm{Mp}{\mathrm{c}}^{-1}$) compared to the simple models, while the amplitudes at large scales ($k\lesssim 0.2\mathrm{Mp}{\mathrm{c}}^{-1}$) are not affected so much. We conclude that the large-scale signal would be detectable with Square Kilometre Array (SKA) and HSC LAE cross-correlation but detecting the small scale signal would require an extended HSC LAE survey with an area of $\sim 75\mathrm{de}{\mathrm{g}}^2$ or 3000 hrs observation time of 21cm line with SKA.

arXiv comment11 pages, 10 figures, accepted to Monthly Notices of the Royal Astronomical Society

References in corpus (36)

• LOFAR: The LOw-Frequency ARray
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• UV-Continuum Slopes of >4000 z~4-8 Galaxies from the HUDF/XDF, HUDF09, ERS, CANDELS-South, and CANDELS-North Fields
• The Murchison Widefield Array: Design Overview
• PAPER-64 Constraints on Reionization: The 21cm Power Spectrum at z=8.4
• Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program Strategy and Clustering Properties of ~2,000 Lya Emitters at z=6-7 over the 0.3-0.5 Gpc${}^2$ Survey Area
• Accelerated Evolution of Ly$\alpha$ Luminosity Function at $\text{z}\gtrsim 7$ Revealed by the Subaru Ultra-Deep Survey for Ly$\alpha$ Emitters at $\text{z}=7.3$
• SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
• SILVERRUSH. V. Census of Lya, [OIII]5007, Ha, and [CII]158um Line Emission with ~1000 LAEs at z=4.9-7.0 Revealed with Subaru/HSC
• Probing Reionization with the 21 cm-Galaxy Cross Power Spectrum
• Multi-redshift limits on the 21cm power spectrum from PAPER
• Probing reionization with LOFAR using 21-cm redshift space distortions
• SILVERRUSH. VI. A simulation of Ly$\alpha$ emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data
• SILVERRUSH. VII. Subaru/HSC Identifications of 42 Protocluster Candidates at z~6-7 with the Spectroscopic Redshifts up to z=6.574: Implications for Cosmic Reionization
• Escape of Lyman-alpha and continuum photons from star-forming galaxies
• The EoR Sensitivity of the Murchison Widefield Array
• The Cross-Correlation of High-Redshift 21 cm and Galaxy Surveys
• SILVERRUSH. II. First Catalogs and Properties of ~2,000 Lya Emitters and Blobs at z~6-7 Identified over the 14-21 deg2 Sky
• The visibility of Lyman Alpha Emitters: constraining reionization, ionizing photons and dust
• Flaring up of the Compact Cloud G2 during the Close Encounter with Sgr A*
• Cross-correlation of the cosmic 21-cm signal and Lyman Alpha Emitters during reionization
• Physical Properties of UDF12 Galaxies in Cosmological simulations
• Predictions for the 21cm-galaxy cross-power spectrum observable with LOFAR and Subaru
• LOFAR insights into the epoch of reionization from the cross power spectrum of 21cm emission and galaxies
• Modelling of Lyman-alpha Emitting Galaxies and Ionized Bubbles at the Era of Reionization
• Detectability of 21cm-signal during the Epoch of Reionization with 21cm-Lyman-$\alpha$ emitter cross-correlation. I
• The cross-power spectrum between 21cm emission and galaxies in hierarchical galaxy formation models
• Clustering and lifetime of Lyman Alpha Emitters in the Epoch of Reionization
• A Halo Model Approach to the $21\mathrm{cm}$ and $\mathrm{Ly}\alpha$ Cross-correlation
• Survey parameters for detecting 21cm - Ly$\alpha$ emitter cross correlations with the Square Kilometre Array
• Detectability of 21cm-signal during the Epoch of Reionization with 21cm-Lyman-α emitter cross-correlation. II. Foreground contamination
• Probing delayed-end reionization histories with the 21cm-LAE cross-power spectrum
• Japanese Cosmic Dawn/Epoch of Reionization Science with the Square Kilometre Array

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• Probing delayed-end reionization histories with the 21cm-LAE cross-power spectrum
• Estimating the Feasibility of 21cm-Ly$\alpha$ Synergies using the Hydrogen Epoch of Reionization Array
• Predicting 21cm-line map from Lyman $\alpha$ emitter distribution with Generative Adversarial Networks
• Detecting galaxy-21-cm cross-correlation during reionization
• The 21cm-galaxy cross-correlation: Realistic forecast for 21cm signal detection and reionisation constraints