Prospects for clustering and lensing measurements with forthcoming intensity mapping and optical surveys

Abstract

We explore the potential of using intensity mapping surveys (MeerKAT, SKA) and optical galaxy surveys (DES, LSST) to detect HI clustering and weak gravitational lensing of 21cm emission in auto- and cross-correlation. Our forecasts show that high precision measurements of the clustering and lensing signals can be made in the near future using the intensity mapping technique. Such studies can be used to test the intensity mapping method, and constrain parameters such as the HI density ${\Omega }_{\mathrm{HI}}$, the HI bias $b_{\mathrm{HI}}$ and the galaxy-HI correlation coefficient $r_{\mathrm{HI}-\mathrm{g}}$.

9 pages, 8 figures, matches version accepted for publication in MNRAS

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• HI and cosmological constraints from intensity mapping, optical, and CMB surveys
• Intensity Mapping as a Probe of Axion Dark Matter
• Determining the HI content of galaxies via intensity mapping cross-correlations
• Cosmological parameter forecasts for HI intensity mapping experiments using the angular power spectrum
• Simulated multi-tracer analyses with HI intensity mapping
• Lensing reconstruction from line intensity maps: the impact of gravitational nonlinearity
• Probing the primordial Universe with MeerKAT and DES
• Gravitational waves $\times$ HI intensity mapping: cosmological and astrophysical applications
• Recovering lost 21 cm radial modes via cosmic tidal reconstruction
• Multipole expansion for HI intensity mapping experiments: simulations and modelling
• Testing gravity at large scales with HI intensity mapping
• Cross-correlating 21 cm and galaxy surveys: implications for cosmology and astrophysics
• HI Intensity Mapping for Clustering-Based Redshift Estimation
• Beyond $\Lambda$CDM with HI intensity mapping: robustness of cosmological constraints in the presence of astrophysics
• Cleaning foregrounds from single-dish 21cm intensity maps with Kernel Principal Component Analysis
• Intensity mapping of the 21cm emission: lensing
• Testing gravity with gravitational waves $\times$ electromagnetic probes cross-correlations
• A new probe of the high-redshift Universe: nulling CMB lensing with interloper-free "LIM-pair" lensing
• Simulations for 21 cm radiation lensing at EoR redshifts
• The gravitational and lensing-ISW bispectrum of 21cm radiation
• Unveiling the Universe with Emerging Cosmological Probes
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier
• Cross-correlation of the Polarizations of the 21-cm and Cosmic Microwave Backgrounds
• Axion-like particle searches with MeerKAT and SKA
• Differentiating Warm Dark Matter Models through 21cm Line Intensity Mapping: A Convolutional Neural Network Approach
• Sensitivity toward dark matter annihilation imprints on 21-cm signal with SKA-Low: A convolutional neural network approach