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Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline
(The American Astronomical Society., 2022)
We describe the validation of the HERA Phase I software pipeline by a series of modular tests, building up to an
end-to-end simulation. The philosophy of this approach is to validate the software and algorithms used in ...
HERA Phase I Limits on the Cosmic 21 cm Signal: Constraints on Astrophysics and Cosmology during the Epoch of Reionization
(The American Astronomical Society., 2022)
Recently, the Hydrogen Epoch of Reionization Array (HERA) has produced the experiment’s first upper limits on
the power spectrum of 21 cm fluctuations at z ∼ 8 and 10. Here, we use several independent theoretical models ...
Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR
(Oxford University Press, 2020)
A new upper limit on the 21 cm signal power spectrum at a redshift of z ≈ 9.1 is presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The analysis includes significant improvements in spectrally ...
Full-sky bispectrum in redshift space for 21cm intensity maps
(IOP Publishing, 2020)
We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in directly observable angular and redshift space, focusing on equal-redshift
correlations and thin redshift bins, for which the ...
Constraining the reionization history using deep learning from 21-cm tomography with the Square Kilometre Array
(Oxford University Press, 2020)
Upcoming 21-cm surveys with the SKA1-LOW telescope will enable imaging of the neutral hydrogen distribution on cosmological scales in the early Universe. These surveys are expected to generate huge imaging data sets that ...
Foreground modelling via Gaussian process regression: an application to HERA data
(Oxford University Press, 2020)
The key challenge in the observation of the redshifted 21-cm signal from cosmic reionization is its separation from the much brighter foreground emission. Such separation relies on the different spectral properties of the ...
Extracting the global signal from 21-cm fluctuations: the multitracer approach
(Oxford University Press, 2019)
The multitracer technique employs a ratio of densities of two differently biased galaxy samples that trace the same underlying matter density field, and was proposed to alleviate the cosmic variance problem. Here, we propose ...
Probing reionization with LOFAR (Low Frequency Array) using 21-cm redshift space distortions
(Oxford University Press, 2013)
One of the most promising ways to study the epoch of reionization (EoR) is through radio
observations of the redshifted 21-cm line emission from neutral hydrogen. These observations
are complicated by the fact that the ...
Cosmic microwave background constraints on a physical model of reionization
(Oxford University Press, 2021)
We study constraints on allowed reionization histories by comparing predictions of a physical seminumerical model with secondary temperature and polarization anisotropies of the cosmic microwave background (CMB). Our model ...
Validation of the hera phase i epoch of reionization 21 cm power spectrum software pipeline
(IOP Publishing, 2022)
We describe the validation of the HERA Phase I software pipeline by a series of modular tests, building up to an
end-to-end simulation. The philosophy of this approach is to validate the software and algorithms used in ...