Studying the Multi-frequency Angular Power Spectrum of the Cosmic Dawn 21-cm Signal

Abstract

The light-cone (LC) anisotropy arises due to cosmic evolution of the cosmic dawn 21-cm signal along the line-of-sight (LoS) axis of the observation volume. The LC effect makes the signal statistically non-ergodic along the LoS axis. The multi-frequency angular power spectrum (MAPS) provides an unbiased alternative to the popular 3D power spectrum as it does not assume statistical ergodicity along every direction in the signal volume. Unlike the 3D power spectrum which mixes the cosmic evolution of the 21-cm signal along the LoS $k$ modes, MAPS keeps the evolution information disentangled. Here we first study the impact of different underlying physical processes during cosmic dawn on the behaviour of the 21-cm MAPS using simulations of various different scenarios and models. We also make error predictions in 21-cm MAPS measurements considering only the system noise and cosmic variance for mock observations of HERA, NenuFAR and SKA-Low. We find that $100\mathrm{h}$ of HERA observations will be able to measure 21-cm MAPS at $\ge 3\sigma$ for $\ell \lesssim 1000$ with $0.1\mathrm{MHz}$ channel-width. The better sensitivity of SKA-Low allows reaching this sensitivity up to $\ell \lesssim 3000$. Note that due to the difference in the frequency coverage of the various experiements, the CD-EoR model considered for NenuFAR is different than those used for the HERA and SKA-Low predictions. Considering NenuFAR with the new model, measurements $\ge 2\sigma$ are possible only for $\ell \lesssim 600$ with $0.2\mathrm{MHz}$ channel-width and for a ten times longer observation time of $t_{\mathrm{obs}}=1000\mathrm{h}$. However, for the range $300\lesssim \ell \lesssim 600$ and $t_{\mathrm{obs}}=1000\mathrm{h}$ more than $3\sigma$ measurements are still possible for NenuFAR when combining consecutive frequency channels within a $5\mathrm{MHz}$ band.

21 pages, 12 figures, 3 tables, accepted for publication in MNRAS

References in corpus (35)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• Model-independent evidence in favor of an end to reionization by z~6
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
• Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\mathbf{z}\approx 9.1$ from LOFAR
• 21 cm fluctuations from inhomogeneous X-ray heating before reionization
• Deep multi-redshift limits on Epoch of Reionisation 21cm Power Spectra from Four Seasons of Murchison Widefield Array Observations
• A Significantly Neutral Intergalactic Medium Around the Luminous z=7 Quasar J0252-0503
• Constraining the neutral fraction of hydrogen in the IGM at redshift 7.5
• First Season MWA EoR Power Spectrum Results at Redshift 7
• A Simple Technique for Predicting High-Redshift Galaxy Evolution
• Foregrounds for redshifted 21 cm studies of reionization: GMRT 153 MHz observations
• Spectral Index of the Diffuse Radio Background Measured From 100 to 200 MHz
• 21 cm signal from cosmic dawn: Imprints of spin temperature fluctuations and peculiar velocities
• Characterizing Foreground for redshifted 21-cm radiation: 150 MHz GMRT observations
• Constraining the intergalactic medium at $z\approx$ 9.1 using LOFAR Epoch of Reionization observations
• First Season MWA Phase II EoR Power Spectrum Results at Redshift 7
• IGM damping wing constraints on reionisation from covariance reconstruction of two $z\gtrsim 7$ QSOs
• Mitigating Internal Instrument Coupling for 21 cm Cosmology I: Temporal and Spectral Modeling in Simulations
• Imaging the redshifted 21-cm pattern around the first sources during the cosmic dawn using the SKA
• The effect of non-Gaussianity on error predictions for the Epoch of Reionization (EoR) 21-cm power spectrum
• Spectral Index of the Diffuse Radio Background Between 50 and 100 MHz
• Detection and extraction of signals from the epoch of reionization using higher order one-point statistics
• Constraining the state of the intergalactic medium during the Epoch of Reionization using MWA 21-cm signal observations
• Comparing Foreground Removal Techniques for Recovery of the LOFAR-EoR 21cm Power Spectrum
• Visibility based angular power spectrum estimation in low frequency radio interferometric observations
• Towards simulating and quantifying the light-cone EoR 21-cm signal
• Studying 21cm power spectrum with one-point statistics
• The impact of non-Gaussianity on the error covariance for observations of the Epoch of Reionization 21-cm power spectrum
• A Tapered Gridded Estimator (TGE) for the Multi-Frequency Angular Power Spectrum (MAPS) and the Cosmological HI 21-cm Power Spectrum
• Detection of Cosmic Structures using the Bispectrum Phase. II. First Results from Application to Cosmic Reionization Using the Hydrogen Epoch of Reionization Array
• Cosmological implications of the composite spectra of galactic X-ray binaries constructed using MAXI data
• The multi-frequency angular power spectrum in parameter studies of the cosmic 21-cm signal
• Multi-frequency angular power spectrum of the 21~cm signal from the Epoch of Reionisation using the Murchison Widefield Array