First Detection of Cosmic Structure in the 21-cm Intensity Field

Abstract

We present the first statistically significant detection of cosmic structure using broadly distributed hydrogen radio emission. This is accomplished using a cross correlation with optical galaxies. Statistical noise levels of $20\mu$K are achieved, unprecedented in this frequency band. This lends support to the idea that large volumes of the universe can be rapidly mapped without the need to resolve individual faint galaxies, enabling precise constraints to dark energy models. We discuss strategies for improved intensity mapping.

5 pages, 4 figures, submitted to MNRAS

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• Testing General Relativity with 21 cm intensity mapping
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• Statistical Description of Synchrotron Intensity Fluctuations: Studies of Astrophysical Magnetic Turbulence
• Overview on spectral line source finding and visualisation
• Detection of Cosmological 21 cm Emission with the Canadian Hydrogen Intensity Mapping Experiment
• Understanding the Diversity of 21 cm Cosmology Analyses
• Evidence for HI replenishment in massive galaxies through gas accretion from the cosmic web
• The 21cm Power Spectrum After Reionization
• Impact of Foregrounds on HI Intensity Mapping Cross-Correlations with Optical Surveys
• GMRT observation towards detecting the Post-reionization 21-cm signal
• Impact of Simulated 1/f Noise for HI Intensity Mapping Experiments
• An accurate low-redshift measurement of the cosmic neutral hydrogen density
• Intensity mapping cross-correlations II: HI halo models including shot noise
• Bayesian semi-blind component separation for foreground removal in interferometric 21-cm observations
• Potential Impact of Global Navigation Satellite Services on Total Power HI Intensity Mapping Surveys
• An Intensity Mapping Constraint on the CO-Galaxy Cross Power Spectrum at Redshift ~ 3
• Prospects for detecting the 326.5 MHz redshifted 21 cm HI signal with the Ooty Radio Telescope (ORT)
• Cross-correlation of the HI 21-cm Signal and Lyman-alpha Forest: A Probe Of Cosmology
• The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps
• HI Intensity Mapping for Clustering-Based Redshift Estimation
• Modelling the post-reionization neutral hydrogen ($\mathrm{HI}$) 21-cm bispectrum
• Observational search for primordial chirality violations using galaxy angular momenta
• An HI intensity mapping survey with a Phased Array Feed
• The Tianlai dish array low-z surveys forecasts
• The Halo Occupation Distribution of HI from 21cm Intensity Mapping at Moderate Redshifts
• Searching for HI imprints in cosmic web filaments with 21-cm intensity mapping
• Towards 21-cm Intensity Mapping at $z=2.28$ with uGMRT using the Tapered Gridded Estimator I: Foreground Avoidance
• Extragalactic Science with the Experiment for Cryogenic Large-aperture Intensity Mapping
• Constraining low redshift [CII] Emission by Cross-Correlating FIRAS and BOSS Data
• Extreme Spheres: Counts-in-cells for 21cm intensity mapping
• Forecasts of cosmological constraints from HI intensity mapping with FAST, BINGO & SKA-I
• A study of the HI gas fractions of galaxies at z ~ 1
• Towards $21$-cm intensity mapping at $z=2.28$ with uGMRT using the tapered gridded estimator -- IV. Wideband analysis
• Spectral-line Observations Using a Phased Array Feed on the Parkes Telescope
• Towards $21$-cm intensity mapping at $z=2.28$ with uGMRT using the tapered gridded estimator II: Cross-polarization power spectrum
• A hybrid multi resolution scheme to efficiently model the structure of reionization on the largest scales
• Geometric Interpretations of the $k$-Nearest Neighbour Distributions
• Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME)
• Expanded Generalized Needlet Internal Linear Combination (eGNILC) Framework for the 21-cm Foreground Removal
• Beam Maps of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Measured with a Drone
• A first quantification of the effects of absorption for HI Intensity Mapping experiments
• Testing General Relativity with Cosmological Large Scale Structure
• A simulation experiment of a pipeline based on machine learning for neutral hydrogen intensity mapping surveys
• Direct correlation of line intensity mapping and CMB lensing from evolution along the lightcone
• FAST drift scan survey for HI intensity mapping: simulation on hunting HI filament with pairwise stacking
• Squared-field cross-correlation between kinetic Sunyaev-Zel'dovich effect and 21-cm intensity mapping
• An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment
• Testing the growth of cosmic structures during the Dark Ages