The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA
arXiv:1906.08943 · doi:10.3847/1538-3881/ab2629
Abstract
The 21\,cm transition of neutral hydrogen is opening an observational window into the cosmic dawn of the universe---the epoch of first star formation. We use 28\,hr of data from the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) to place upper limits on the spatial power spectrum of 21\,cm emission at (), and within the absorption feature reported by the EDGES experiment (Bowman et al. 2018). In the process we demonstrate the first application of the double Karhunen-Loève transform for foreground filtering, and diagnose the systematic errors that are currently limiting the measurement. We also provide an updated model for the angular power spectrum of low-frequency foreground emission measured from the northern hemisphere, which can be used to refine sensitivity forecasts for next-generation experiments.
arXiv commentThe authors really hoping you're having a fantastic day. You keep being awesome!
References in corpus (47)
- Planck 2015 results. XIII. Cosmological parameters
- Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
- An absorption profile centred at 78 megahertz in the sky-averaged spectrum
- 21-cm cosmology
- WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
- Hydrogen Epoch of Reionization Array (HERA)
- Possible interaction between baryons and dark-matter particles revealed by the first stars
- How to measure CMB power spectra without losing information
- Reionization and the Cosmic Dawn with the Square Kilometre Array
- A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment
- A Per-Baseline, Delay-Spectrum Technique for Accessing the 21cm Cosmic Reionization Signature
- Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations
- Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
- Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR
- PAPER-64 Constraints on Reionization: The 21cm Power Spectrum at z=8.4
- Concerns about Modelling of the EDGES Data
- Imaging the Epoch of Reionization: limitations from foreground confusion and imaging algorithms
- Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude
- All-Sky Interferometry with Spherical Harmonic Transit Telescopes
- Calibration Requirements for Detecting the 21 cm Epoch of Reionization Power Spectrum and Implications for the SKA
- Real-Time Calibration of the Murchison Widefield Array
- Coaxing Cosmic 21cm Fluctuations from the Polarized Sky using m-mode Analysis
- Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems
- First Season MWA EoR Power Spectrum Results at Redshift 7
- Constraining Baryon--Dark Matter Scattering with the Cosmic Dawn 21-cm Signal
- On using visibility correlations to probe the HI distribution from the dark ages to the present epoch I: Formalism and the expected signal
- Foregrounds in Wide-Field Redshifted 21 cm Power Spectra
- The 21-cm signature of the first stars during the Lyman-Werner feedback era
- The Radio Background Below 100 MHz
- The multi-frequency angular power spectrum of the epoch of reionization 21 cm signal
- The Impact of Modeling Errors on Interferometer Calibration for 21 cm Power Spectra
- First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating
- SARAS 2 constraints on global 21-cm signals from the Epoch of Reionization
- 21CMMC with a 3D light-cone: the impact of the co-evolution approximation on the astrophysics of reionisation and cosmic dawn
- The Radio Sky at Meter Wavelengths: m-Mode Analysis Imaging with the Owens Valley Long Wavelength Array
- Initial LOFAR observations of Epoch of Reionization windows: II. Diffuse polarized emission in the ELAIS-N1 field
- Improved Measurement of the Spectral Index of the Diffuse Radio Background Between 90 and 190 MHz
- Complete history of the observable 21-cm signal from the first stars during the pre-reionization era
- A Fast Method for Power Spectrum and Foreground Analysis for 21 cm Cosmology
- Fast gain calibration in radio astronomy using alternating direction implicit methods: Analysis and applications
- Mining Weak Lensing Surveys
- A wide-band, active antenna system for long wavelength radio astronomy
- The Evolution of Cas A at Low Radio Frequencies
- A simultaneous search for prompt radio emission associated with the short GRB 170112A using the all-sky imaging capability of the OVRO-LWA
- Implication of the Shape of the EDGES Signal for the 21 cm Power Spectrum
- New probe of magnetic fields in the prereionization epoch. I. Formalism
- A practical theorem on using interferometry to measure the global 21-cm signal
Cited by in corpus (86)
- Ultra-Light Dark Matter
- Data Analysis for Precision 21 cm Cosmology
- Introducing the THESAN project: radiation-magnetohydrodynamic simulations of the epoch of reionization
- Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
- First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum
- Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
- The Impact of the First Galaxies on Cosmic Dawn and Reionization
- Constraining the intergalactic medium at 9.1 using LOFAR Epoch of Reionization observations
- Probing the Small-Scale Matter Power Spectrum with Large-Scale 21-cm Data
- Tight Constraints on the Excess Radio Background at from LOFAR
- High-redshift radio galaxies: a potential new source of 21-cm fluctuations
- Interpreting LOFAR 21-cm signal upper limits at z~9.1 in the context of high-z galaxy and reionisation observations
- Mitigating Internal Instrument Coupling II: A Method Demonstration with the Hydrogen Epoch of Reionization Array
- Emulating the Global 21-cm Signal from Cosmic Dawn and Reionization
- Exploring reionisation and high-z galaxy observables with recent multi-redshift MWA upper limits on the 21-cm signal
- A new MWA limit on the 21 cm Power Spectrum at Redshifts 13 17
- Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations
- First upper limits on the 21 cm signal power spectrum from cosmic dawn from one night of observations with NenuFAR
- Gaussian Process Foreground Subtraction and Power Spectrum Estimation for 21 cm Cosmology
- A 21-cm power spectrum at 48 MHz, using the Owens Valley Long Wavelength Array
- Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum
- Validation of EDGES Low-Band Antenna Beam Model
- The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough
- Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
- Constraining the X-ray heating and reionization using 21-cm power spectra with Marginal Neural Ratio Estimation
- New EoR Power Spectrum Limits From MWA Phase II Using the Delay Spectrum Method and Novel Systematic Rejection
- Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline
- ETHOS -- An Effective Theory of Structure Formation: Impact of Dark Acoustic Oscillations on Cosmic Dawn
- Studying Cosmic Dawn using redshifted HI 21-cm signal: A brief review
- Shot noise and scatter in the star formation efficiency as a source of 21-cm fluctuations
- A unified framework for 21cm tomography sample generation and parameter inference with Progressively Growing GANs
- New Limits on the Low-frequency Radio Transient Sky Using 31 hr of All-sky Data with the OVRO-LWA
- Exploring the cosmic dawn and epoch of reionization with 21cm line
- Modelling Population III stars for semi-numerical simulations
- Detecting the non-Gaussianity of the 21-cm signal during reionisation with the Wavelet Scattering Transform
- A Semi-blind PCA-based Foreground Subtraction Method for 21 cm Intensity Mapping
- Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum
- Forecasts and Statistical Insights for Line Intensity Mapping Cross-Correlations: A Case Study with 21cm x [CII]
- Imaging Spectroscopy of CME-Associated Solar Radio Bursts
- Impact of instrument and data characteristics in the interferometric reconstruction of the 21 cm power spectrum
- Accurate modelling of the Lyman- coupling for the 21-cm signal, observability with NenuFAR and SKA
- Constraints on the state of the IGM at using redshifted 21-cm observations with LOFAR
- Photoevaporation of Minihalos during Cosmic Reionization: Primordial and Metal-Enriched Halos
- Emulation of the Cosmic Dawn 21-cm Power Spectrum and Classification of Excess Radio Models Using an Artificial Neural Network
- Generating extremely large-volume reionisation simulations
- A galaxy-free phenomenological model for the 21-cm power spectrum during reionization
- Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
- Degree-Scale Galactic Radio Emission at 122 MHz around the North Celestial Pole with LOFAR-AARTFAAC
- Transient RFI environment of LOFAR-LBA at 72-75 MHz: Impact on ultra-widefield AARTFAAC Cosmic Explorer observations of the redshifted 21-cm signal
- Improved upper limits on the 21-cm signal power spectrum at and from an optimal field observed with NenuFAR
- A fast method of reionization parameter space exploration using GPR trained SCRIPT
- Cosmic mysteries and the hydrogen 21-cm line: bridging the gap with lunar observations
- Mapping discrete galaxies at cosmic dawn with 21-centimeter observations
- Effects of model incompleteness on the drift-scan calibration of radio telescopes
- Spectral modelling of Cygnus A between 110 and 250 MHz. Impact on the LOFAR 21-cm signal power spectrum
- Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
- Synchrotron emission from virial shocks around stacked OVRO-LWA galaxy clusters
- Ionospheric contributions to the excess power in high-redshift 21-cm power-spectrum observations with LOFAR
- Delay-Weighted Calibration: Precision Calibration for 21 cm Cosmology with Resilience to Sky Model Error
- Search for the Epoch of Reionisation with HERA: Upper Limits on the Closure Phase Delay Power Spectrum
- Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal
- Simulated Predictions for HI at with the Ooty Wide Field Array (OWFA) -- II: Foreground Avoidance
- The FHD Polarized Imaging Pipeline: A New Approach to Widefield Interferometric Polarimetry
- Measurements of one-point statistics in 21 cm intensity maps via foreground avoidance strategy
- Prospects of FRBs and Large Scale 21 cm Power Spectra in Constraining the Epoch of Reionization
- A strong broadband 21 cm cosmological signal from dark matter spin-flip interactions
- Bayesian evidence for flux scale errors in Galactic synchrotron maps
- Probing isocurvature perturbations with 21-cm global signal in the light of HERA result
- Low-Frequency Radio Recombination Lines Away From the Inner Galactic Plane
- Field-level Reconstruction from Foreground-Contaminated 21-cm Maps
- Forecasting 21-cm power spectrum sensitivity to dark Matter-baryon scattering
- Measuring the global 21-cm signal with the MWA-II: improved characterisation of lunar-reflected radio frequency interference
- Common Origin of Warm Dark Matter and Dark Radiation
- Particle production during inflation: constraints expected from redshifted 21 cm observations from the epoch of reionization
- oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
- Extracting the Epoch of Reionization Signal with 3D U-Net Neural Networks Using Data-driven Systematic Effect Model
- The haloes that reionized the Universe
- An improved algorithm for separating clock delays from ionospheric effects in radio astronomy
- Beyond the Power Spectrum: A New Framework for Non-Stationary Fields with Applications to Light-Cone Effects in Line Intensity Mapping
- Effect of the cosmological transition to metal-enriched star-formation on the hydrogen 21-cm signal
- Classification of Radio Backgrounds at Cosmic Dawn and 21 cm Signal Confirmation Using Neural Networks
- Measurements of the diffuse Galactic synchrotron spectral index and curvature from MeerKLASS pilot data
- Simulating a full-sky high resolution Galactic synchrotron spectral index map using neural networks
- First Light: Switching on Stars at the Dawn of Time
- Mitigating incoherent excess variance in high-redshift 21 cm observations with multi-output cross-Gaussian process regression
- Establishing a relationship between the cosmological 21 cm power spectrum and interferometric closure phases