Emulating the Global 21-cm Signal from Cosmic Dawn and Reionization
arXiv:1910.06274 · doi:10.1093/mnras/staa1530
Abstract
The 21-cm signal of neutral hydrogen is a sensitive probe of the Epoch of Reionization (EoR) and Cosmic Dawn. Currently operating radio telescopes have ushered in a data-driven era of 21-cm cosmology, providing the first constraints on the astrophysical properties of sources that drive this signal. However, extracting astrophysical information from the data is highly non-trivial and requires the rapid generation of theoretical templates over a wide range of astrophysical parameters. To this end emulators are often employed, with previous efforts focused on predicting the power spectrum. In this work we introduce 21cmGEM - the first emulator of the global 21-cm signal from Cosmic Dawn and the EoR. The smoothness of the output signal is guaranteed by design. We train neural networks to predict the cosmological signal using a database of ~30,000 simulated signals which were created by varying seven astrophysical parameters: the star formation efficiency and the minimal mass of star-forming halos; the efficiency of the first X-ray sources and their spectrum parameterized by spectral index and the low energy cutoff; the mean free path of ionizing photons and the CMB optical depth. We test the performance with a set of ~2,000 simulated signals, showing that the relative error in the prediction has an r.m.s. of 0.0159. The algorithm is efficient, with a running time per parameter set of 0.16 sec. Finally, we use the database of models to check the robustness of relations between the features of the global signal and the astrophysical parameters that we previously reported.
arXiv comment17 pages, 13 figures, accepted for publication in MNRAS
References in corpus (89)
- The Formation of the First Star in the Universe
- In the Beginning: The First Sources of Light and the Reionization of the Universe
- UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
- An absorption profile centred at 78 megahertz in the sky-averaged spectrum
- An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
- The Formation of the First Stars. I. The Primordial Star Forming Cloud
- How small were the first cosmological objects?
- 21cmFAST: A Fast, Semi-Numerical Simulation of the High-Redshift 21-cm Signal
- High Mass X-ray Binaries as a Star Formation Rate Indicator in Distant Galaxies
- Hydrogen Epoch of Reionization Array (HERA)
- Simulations of Early Structure Formation: Primordial Gas Clouds
- X-ray emission from star-forming galaxies - I. High-mass X-ray binaries
- Possible interaction between baryons and dark-matter particles revealed by the first stars
- Model-independent evidence in favor of an end to reionization by z~6
- Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
- Dark Halo and Disk Galaxy Scaling Laws in Hierarchical Universes
- Planck intermediate results. XLVI. Reduction of large-scale systematic effects in HFI polarization maps and estimation of the reionization optical depth
- Destruction of Molecular Hydrogen During Cosmological Reionization
- The Birth of a Galaxy - III. Propelling reionisation with the faintest galaxies
- Simulations of Pregalactic Structure Formation with Radiative Feedback
- The Radiative Feedback of the First Cosmological Objects
- A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment
- Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at from LOFAR
- Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
- Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR
- Early reionization by miniquasars
- Insights on Dark Matter from Hydrogen during Cosmic Dawn
- Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn
- 21CMMC: an MCMC analysis tool enabling astrophysical parameter studies of the cosmic 21 cm signal
- Concerns about Modelling of the EDGES Data
- Stellar black holes at the dawn of the universe
- Population III star formation in a Lambda CDM universe, II: Effects of a photodissociating background
- Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
- Energy Feedback from X-ray Binaries in the Early Universe
- Signatures of X-rays in the early Universe
- Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude
- A lower limit of dz > 0.06 for the duration of the reionization epoch
- The observable signature of late heating of the Universe during cosmic reionization
- Charting the Parameter Space of the Global 21-cm Signal
- Reionization by Hard Photons: I. X-rays from the First Star Clusters
- Impact of the Relative Motion between the Dark Matter and Baryons on the First Stars
- The signature of the first stars in atomic hydrogen at redshift 20
- Design and characterization of the Large-Aperture Experiment to Detect the Dark Age (LEDA) radiometer systems
- Suppression of H_2 Cooling in the Ultraviolet Background
- First Season MWA EoR Power Spectrum Results at Redshift 7
- Constraining Baryon--Dark Matter Scattering with the Cosmic Dawn 21-cm Signal
- Lx-SFR relation in star forming galaxies
- Fast Large Volume Simulations of the 21 cm Signal from the Reionization and pre-Reionization Epochs
- Are we witnessing the epoch of reionisation at from the spectrum of J1120+0641?
- The 21-cm signature of the first stars during the Lyman-Werner feedback era
- Photoionization, Numerical Resolution, and Galaxy Formation
- The Global 21-cm Signal in the Context of the High-z Galaxy Luminosity Function
- Testing for calibration systematics in the EDGES low-band data using Bayesian model selection
- Improving the Epoch of Reionization Power Spectrum Results from Murchison Widefield Array Season 1 Observations
- A simplified, lossless re-analysis of PAPER-64
- Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
- The redshifted 21-cm signal in the EDGES low-band spectrum
- Large-scale BAO signatures of the smallest galaxies
- First results on the Epoch of Reionization from First Light with SARAS 2
- Bayesian constraints on the global 21-cm signal from the Cosmic Dawn
- The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA
- Results from EDGES High-Band: I. Constraints on Phenomenological Models for the Global cm Signal
- The Effects of Dark Matter-Baryon Scattering on Redshifted 21 cm Signals
- Emulating Simulations of Cosmic Dawn for 21cm Power Spectrum Constraints on Cosmology, Reionization, and X-ray Heating
- The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z=20-25 from LOFAR
- Constraining the intergalactic medium at 9.1 using LOFAR Epoch of Reionization observations
- How does radiative feedback from a UV background impact reionization?
- SARAS 2 constraints on global 21-cm signals from the Epoch of Reionization
- The Influence of Streaming Velocities on the Formation of the First Stars
- First Season MWA Phase II EoR Power Spectrum Results at Redshift 7
- 21CMMC with a 3D light-cone: the impact of the co-evolution approximation on the astrophysics of reionisation and cosmic dawn
- Analysing the 21cm signal from the Epoch of Reionization with artificial neural networks
- Emulation of reionization simulations for Bayesian inference of astrophysics parameters using neural networks
- Recovery from population III supernova explosions and the onset of second generation star formation
- ALMA observations of molecular clouds in three group centered elliptical galaxies: NGC 5846, NGC 4636, and NGC 5044
- High-Redshift Star Formation in a Time-Dependent Lyman-Werner Background
- Model-independent constraints on the hydrogen-ionizing emissivity at z>6
- Unveiling the nature of dark matter with high redshift 21 cm line experiments
- Constraining the redshifted 21-cm signal with the unresolved soft X-ray background
- Results from EDGES High-Band: III. New Constraints on Parameters of the Early Universe
- Evaluating machine learning techniques for predicting power spectra from reionization simulations
- The Radio Scream from Black Holes at Cosmic Dawn: A Semi-Analytic Model for the Impact of Radio Loud Black-Holes on the 21 cm Global Signal
- A suppressed contribution of low mass galaxies to reionization due to supernova feedback
- Results from EDGES High-Band: II. Constraints on Parameters of Early Galaxies
- The 21-cm BAO signature of enriched low-mass galaxies during cosmic reionization
- Lyman-Werner UV Escape Fractions from Primordial Halos
- On the contamination of the global 21~cm signal from polarized foregrounds
- Epoch of Reionisation 21cm Forecasting From MCMC-Constrained Semi-Numerical Models
- Properties of reionization-era galaxies from JWST luminosity functions and 21-cm interferometry
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- Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
- HERA Phase I Limits on the Cosmic 21-cm Signal: Constraints on Astrophysics and Cosmology During the Epoch of Reionization
- The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
- Constraining the intergalactic medium at 9.1 using LOFAR Epoch of Reionization observations
- Tight Constraints on the Excess Radio Background at from LOFAR
- High-redshift radio galaxies: a potential new source of 21-cm fluctuations
- The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
- A General Bayesian Framework for Foreground Modelling and Chromaticity Correction for Global 21cm Experiments
- Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations
- maxsmooth: Rapid Maximally Smooth Function Fitting With Applications in Global 21-cm Cosmology
- Lyman- coupling and heating at Cosmic Dawn
- GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
- A 21-cm power spectrum at 48 MHz, using the Owens Valley Long Wavelength Array
- Impact of the Primordial Stellar Initial Mass Function on the 21-cm Signal
- Deep learning approach for identification of HII regions during reionization in 21-cm observations
- 21cmVAE: A Very Accurate Emulator of the 21-cm Global Signal
- Cosmological Constraints from the eBOSS Lyman- Forest using the PRIYA Simulations
- From EMBER to FIRE: predicting high resolution baryon fields from dark matter simulations with Deep Learning
- Extracting the 21-cm Power Spectrum and the reionization parameters from mock datasets using Artificial Neural Networks
- A unified framework for 21cm tomography sample generation and parameter inference with Progressively Growing GANs
- Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
- Systematic uncertainties in models of the cosmic dawn
- Exploring the cosmic dawn and epoch of reionization with 21cm line
- Using Artificial Neural Networks to extract the 21-cm Global Signal from the EDGES data
- Sky-averaged 21-cm signal extraction using multiple antennas with an SVD framework: the REACH case
- 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
- Extracting the Global 21-cm signal from Cosmic Dawn and Epoch of Reionization in the presence of Foreground and Ionosphere
- Emulation of the Cosmic Dawn 21-cm Power Spectrum and Classification of Excess Radio Models Using an Artificial Neural Network
- SKA-Low Intensity Mapping Pathfinder Updates: Deeper 21 cm Power Spectrum Limits from Improved Analysis Frameworks
- A Multi-Fidelity Emulator for the Lyman- Forest Flux Power Spectrum
- Extracting the Global Signal from 21-cm Fluctuations: the Multi-Tracer Approach
- Simulation-Based Inference of the sky-averaged 21-cm signal from CD-EoR with REACH
- RHINO: A large horn antenna for detecting the 21cm global signal
- Probing the intergalactic medium during the Epoch of Reionization using 21-cm signal power spectra
- FlexKnot as a Generalised Model of the Sky-averaged 21-cm Signal at z ~ 6-30 in the Presence of Systematics
- Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets
- MF-Box: Multi-fidelity and multi-scale emulation for the matter power spectrum
- Probing the Epoch of Reionization using synergies of line intensity mapping
- Comparing sampling techniques to chart parameter space of 21 cm Global signal with Artificial Neural Networks
- STARFIRE: An algorithm for estimating radio frequency interference in orbits around Earth
- Impact of Calibration and Position Errors on Astrophysical Parameters of the HI 21cm Signal
- On Measuring the 21 cm Global Spectrum of the Cosmic Dawn with an Interferometer Array
- Synthetic Observations with the Square Kilometre Array (SKA) -- development towards an end-to-end pipeline
- In Search of Global 21-cm Signal using Artificial Neural Network in light of ARCADE 2
- Exploring Machine Learning Regression Models for Advancing Foreground Mitigation and Global 21cm Signal Parameter Extraction
- A Comprehensive Bayesian re-analysis of the SARAS2 data from the Epoch of Reionization
- 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
- Nonlinear reconstruction of 21cm global signal from 21cm power spectrum with artificial neural networks
- On the accuracy of posterior recovery with neural network emulators
- Accelerating reionization constraints: An ANN-emulator framework for the SCRIPT Semi-numerical Model
- A bubble size distribution model for the Epoch of Reionization