Matthys Maree
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View article: The SARAO MeerKAT 1.3 GHz Galactic Plane Survey
The SARAO MeerKAT 1.3 GHz Galactic Plane Survey Open
We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane (251° ≤l ≤ 358° and 2° ≤l ≤ 61° at |b| ≤ $1{_{.}^{\circ}}5$). SMGPS is the largest, most sensitive, and highest ang…
View article: The SARAO MeerKAT 1.3 GHz Galactic Plane Survey
The SARAO MeerKAT 1.3 GHz Galactic Plane Survey Open
We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane (251°$\le l \le$ 358°and 2°$\le l \le$ 61°at $|b| \le 1.5°$). SMGPS is the largest, most sensitive and highest angu…
View article: Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations Open
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA). Using similar analysis techniques as in previ…
View article: Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations Open
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA). Using similar analysis techniques as in previ…
View article: First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum
First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum Open
We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights of data (∼36 hr of integration) from Phase I of the Hydrogen Epoch of Reionization Array (HERA). The Phase I data show eviden…
View article: Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline
Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline Open
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 the Phase I upper-li…
View article: HERA Phase I Limits on the Cosmic 21 cm Signal: Constraints on Astrophysics and Cosmology during the Epoch of Reionization
HERA Phase I Limits on the Cosmic 21 cm Signal: Constraints on Astrophysics and Cosmology during the Epoch of Reionization Open
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 to infer constraint…
View article: Imaging and Modeling Data from the Hydrogen Epoch of Reionization Array
Imaging and Modeling Data from the Hydrogen Epoch of Reionization Array Open
© 2020. The American Astronomical Society. All rights reserved. We analyze data from the Hydrogen Epoch of Reionization Array (HERA). This is the third in a series of papers on the closure phase delay spectrum technique designed to detect …
View article: The HERA-19 Commissioning Array: Direction-dependent Effects
The HERA-19 Commissioning Array: Direction-dependent Effects Open
© 2019. The American Astronomical Society. All rights reserved. Foreground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted H i emission from the Epoch of Reionization (EoR). The ch…
View article: Effects of model incompleteness on the drift-scan calibration of radio telescopes
Effects of model incompleteness on the drift-scan calibration of radio telescopes Open
Precision calibration poses challenges to experiments probing the redshifted 21-cm signal of neutral hydrogen from the Cosmic Dawn and Epoch of Reionization (z ∼ 30–6). In both interferometric and global signal experiments, systematic cali…
View article: A Real Time Processing System for Big Data in Astronomy: Applications to\n HERA
A Real Time Processing System for Big Data in Astronomy: Applications to\n HERA Open
As current- and next-generation astronomical instruments come online, they\nwill generate an unprecedented deluge of data. Analyzing these data in real\ntime presents unique conceptual and computational challenges, and their\nlong-term sto…
View article: Understanding the HERA Phase I receiver system with simulations and its impact on the detectability of the EoR delay power spectrum
Understanding the HERA Phase I receiver system with simulations and its impact on the detectability of the EoR delay power spectrum Open
The detection of the Epoch of Reionization (EoR) delay power spectrum using a ‘foreground avoidance method’ highly depends on the instrument chromaticity. The systematic effects induced by the radio telescope spread the foreground signal i…
View article: Redundant-baseline calibration of the hydrogen epoch of reionization array
Redundant-baseline calibration of the hydrogen epoch of reionization array Open
In 21-cm cosmology, precision calibration is key to the separation of the neutral hydrogen signal from very bright but spectrally smooth astrophysical foregrounds. The Hydrogen Epoch of Reionization Array (HERA), an interferometer speciali…
View article: Detection of cosmic structures using the bispectrum phase. II. First results from application to cosmic reionization using the Hydrogen Epoch of Reionization Array
Detection of cosmic structures using the bispectrum phase. II. First results from application to cosmic reionization using the Hydrogen Epoch of Reionization Array Open
Characterizing the epoch of reionization (EoR) at z≳6 via the redshifted 21 cm line of neutral Hydrogen (H i) is critical to modern astrophysics and cosmology, and thus a key science goal of many current and planned low-frequency radio tel…
View article: Measuring HERA's Primary Beam in Situ: Methodology and First Results
Measuring HERA's Primary Beam in Situ: Methodology and First Results Open
The central challenge in 21 cm cosmology is isolating the cosmological signal from bright foregrounds. Many separation techniques rely on the accurate knowledge of the sky and the instrumental response, including the antenna primary beam. …
View article: Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum
Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum Open
We discuss absolute calibration strategies for Phase I of the Hydrogen Epoch of Reionization Array (HERA), which aims to measure the cosmological 21 cm signal from the Epoch of Reionization. HERA is a drift-scan array with a 10° wide field…
View article: Mitigating Internal Instrument Coupling for 21 cm Cosmology. II. A Method Demonstration with the Hydrogen Epoch of Reionization Array
Mitigating Internal Instrument Coupling for 21 cm Cosmology. II. A Method Demonstration with the Hydrogen Epoch of Reionization Array Open
We present a study of internal reflection and cross-coupling systematics in Phase I of the Hydrogen Epoch of Reionization Array (HERA). In a companion paper, we outlined the mathematical formalism for such systematics and presented algorit…
View article: Foreground modelling via Gaussian process regression: an application to HERA data
Foreground modelling via Gaussian process regression: an application to HERA data Open
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 two components, a…
View article: Electrical and electromagnetic co-simulations of the HERA Phase I receiver system including the effects of mutual coupling, and impact on the EoR window
Electrical and electromagnetic co-simulations of the HERA Phase I receiver system including the effects of mutual coupling, and impact on the EoR window Open
The detection of the Epoch of Reionization (EoR) delay power spectrum using a avoidance highly depends on the instrument chromaticity. The systematic effects induced by the radio-telescope spread the foreground signal in the delay domain…
Optimizing sparse RFI prediction using deep learning Open
Radio frequency interference (RFI) is an ever-present limiting factor among radio telescopes even in the most remote observing locations. When looking to retain the maximum amount of sensitivity and reduce contamination for Epoch of Reioni…
View article: Preacher girl – Uldine Utley and the industry of revival
Preacher girl – Uldine Utley and the industry of revival Open
Acta Theologica is the official and accredited theological journal of the Faculty of Theology of the University of the Free State, Bloemfontein, South Africa. Acta Theologica is an accredited South African journal publishing independently …
View article: The HERA-19 Commissioning Array: Direction-dependent Effects
The HERA-19 Commissioning Array: Direction-dependent Effects Open
Foreground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted H i emission from the Epoch of Reionization (EoR). The chromaticity of the instrument creates a boundary in the Fourier t…
View article: Hydrogen Epoch of Reionization Array (HERA)
Hydrogen Epoch of Reionization Array (HERA) Open
The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization (z = 6-12), and to explore earlier epochs of our Cosmic Dawn (z …
View article: Hydrogen Epoch of Reionization Array (HERA)
Hydrogen Epoch of Reionization Array (HERA) Open
The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization ($z=6-12$), and to explore earlier epochs of our Cosmic Dawn ($z…
View article: Engineering and science highlights of the KAT-7 radio telescope
Engineering and science highlights of the KAT-7 radio telescope Open
The construction of the seven-dish Karoo Array Telescope (KAT-7) array in the Karoo region of the Northern Cape in South Africa was intended primarily as an engineering prototype for technologies and techniques applicable to the MeerKAT te…
View article: PAPER-64 CONSTRAINTS ON REIONIZATION: THE 21 cm POWER SPECTRUM AT<i>z</i>= 8.4
PAPER-64 CONSTRAINTS ON REIONIZATION: THE 21 cm POWER SPECTRUM AT<i>z</i>= 8.4 Open
In this paper, we report new limits on 21cm emission from cosmic reionization\nbased on a 135-day observing campaign with a 64-element deployment of the\nDonald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER)\nin So…