James E. Aguirre
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View article: fftvis: A Non-Uniform Fast Fourier Transform Based Interferometric Visibility Simulator
fftvis: A Non-Uniform Fast Fourier Transform Based Interferometric Visibility Simulator Open
The detection and characterization of the 21 cm signal from the Epoch of Reionization (EoR) demands extraordinary precision in radio interferometric observations and analysis. For modern low-frequency arrays, achieving the dynamic range ne…
View article: Exploring One-point Statistics in HERA Phase I Data: Effects of Foregrounds and Systematics on Measuring One-point Statistics
Exploring One-point Statistics in HERA Phase I Data: Effects of Foregrounds and Systematics on Measuring One-point Statistics Open
Measuring one-point statistics in redshifted 21 cm intensity maps offers an opportunity to explore non-Gaussian features of the early Universe. We assess the impact of instrumental effects on measurements made with the Hydrogen Epoch of Re…
View article: Far-infrared lines hidden in archival deep multi-wavelength surveys: Limits on [CII]-158$μ$m at $z \sim 0.3-2.9$
Far-infrared lines hidden in archival deep multi-wavelength surveys: Limits on [CII]-158$μ$m at $z \sim 0.3-2.9$ Open
Singly-ionized carbon is theorized to be the brightest emission line feature in star-forming galaxies, and hence an excellent tracer of the evolution of cosmic star formation. Archival maps from far-infrared and sub-millimeter surveys pote…
View article: The Simons Observatory: science goals and forecasts for the enhanced Large Aperture Telescope
The Simons Observatory: science goals and forecasts for the enhanced Large Aperture Telescope Open
We describe updated scientific goals for the wide-field, millimeter-wave survey that will be produced by the Simons Observatory (SO). Significant upgrades to the 6-meter SO Large Aperture Telescope (LAT) are expected to be complete by 2028…
View article: Investigating mutual coupling in the hydrogen epoch of reionization array and mitigating its effects on the 21-cm power spectrum
Investigating mutual coupling in the hydrogen epoch of reionization array and mitigating its effects on the 21-cm power spectrum Open
Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on the 21-cm power spectrum, but some k-modes remain systematics-dominated. Mutual cou…
View article: fftvis: A Non-Uniform Fast Fourier Transform Based Interferometric Visibility Simulator
fftvis: A Non-Uniform Fast Fourier Transform Based Interferometric Visibility Simulator Open
The detection and characterization of the 21cm signal from the Epoch of Reionization (EoR) demands extraordinary precision in radio interferometric observations and analysis. For modern low-frequency arrays, achieving the dynamic range nec…
View article: A Generalized Method for Characterizing 21 cm Power Spectrum Signal Loss from Temporal Filtering of Drift-scanning Visibilities
A Generalized Method for Characterizing 21 cm Power Spectrum Signal Loss from Temporal Filtering of Drift-scanning Visibilities Open
A successful detection of the cosmological 21 cm signal from intensity mapping experiments (e.g., during the Epoch of Reionization or Cosmic Dawn) is contingent on the suppression of subtle systematic effects in the data. Some of these sys…
View article: The Simons Observatory: Science Goals and Forecasts for the Enhanced Large Aperture Telescope
The Simons Observatory: Science Goals and Forecasts for the Enhanced Large Aperture Telescope Open
We describe updated scientific goals for the wide-field, millimeter-wave survey that will be produced by the Simons Observatory (SO). Significant upgrades to the 6-meter SO Large Aperture Telescope (LAT) are expected to be complete by 2028…
View article: Impacts and Statistical Mitigation of Missing Data on the 21 cm Power Spectrum: A Case Study with the Hydrogen Epoch of Reionization Array
Impacts and Statistical Mitigation of Missing Data on the 21 cm Power Spectrum: A Case Study with the Hydrogen Epoch of Reionization Array Open
The precise characterization and mitigation of systematic effects is one of the biggest roadblocks impeding the detection of the fluctuations of cosmological 21 cm signals. Missing data in radio cosmological experiments, often due to radio…
View article: <tt>matvis</tt>: a matrix-based visibility simulator for fast forward modelling of many-element 21 cm arrays
matvis: a matrix-based visibility simulator for fast forward modelling of many-element 21 cm arrays Open
Detection of the faint 21 cm line emission from the Cosmic Dawn and Epoch of Reionization will require not only exquisite control over instrumental calibration and systematics to achieve the necessary dynamic range of observations but also…
View article: A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline
A demonstration of the effect of fringe-rate filtering in the hydrogen epoch of reionization array delay power spectrum pipeline Open
Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different time-scales. These can be isolated by designing appropriate Fourier filt…
View article: Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations
Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations Open
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionization (EoR). This has led to the construction of low-frequency radio interferometric arrays, such as the Hydrogen Epoch of Reioni…
View article: A Generalized Method for Characterizing 21-cm Power Spectrum Signal Loss from Temporal Filtering of Drift-scanning Visibilities
A Generalized Method for Characterizing 21-cm Power Spectrum Signal Loss from Temporal Filtering of Drift-scanning Visibilities Open
A successful detection of the cosmological 21-cm signal from intensity mapping experiments (for example, during the Epoch of Reioinization or Cosmic Dawn) is contingent on the suppression of subtle systematic effects in the data. Some of t…
View article: Bayesian estimation of cross-coupling and reflection systematics in 21cm array visibility data
Bayesian estimation of cross-coupling and reflection systematics in 21cm array visibility data Open
Observations with radio arrays that target the 21-cm signal originating from the early Universe suffer from a variety of systematic effects. An important class of these are reflections and spurious couplings between antennas. We apply a Ha…
View article: Direct Optimal Mapping Image Power Spectrum and its Window Functions
Direct Optimal Mapping Image Power Spectrum and its Window Functions Open
The key to detecting neutral hydrogen during the epoch of reionization (EoR) is to separate the cosmological signal from the dominating foreground radiation. We developed direct optimal mapping (DOM) to map interferometric visibilities; it…
View article: Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations
Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations Open
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of the Epoch of Reionisation (EoR). This has led to the construction of low-frequency radio interferometric arrays, such as the Hydrogen Epoch of Reioni…
View article: Making Research Data Flow With Python
Making Research Data Flow With Python Open
The increasing volume of research data in fields such as astronomy, biology, and engineering necessitates efficient distributed data management. Traditional commercial solutions are often unsuitable for the decentralized infrastructure typ…
View article: Cosmic Ray Susceptibility of the Terahertz Intensity Mapper Detector Arrays
Cosmic Ray Susceptibility of the Terahertz Intensity Mapper Detector Arrays Open
View article: Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning
Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning Open
This paper presents the design and deployment of the Hydrogen Epoch of Reionization Array (HERA) phase II system. HERA is designed as a staged experiment targeting 21 cm emission measurements of the Epoch of Reionization. First results fro…
View article: The BLAST Observatory: A Sensitivity Study for Far-IR Balloon-borne Polarimeters
The BLAST Observatory: A Sensitivity Study for Far-IR Balloon-borne Polarimeters Open
Sensitive wide-field observations of polarized thermal emission from interstellar dust grains will allow astronomers to address key outstanding questions about the life cycle of matter and energy driving the formation of stars and the evol…
View article: A demonstration of the effect of fringe-rate filtering in the Hydrogen Epoch of Reionization Array delay power spectrum pipeline
A demonstration of the effect of fringe-rate filtering in the Hydrogen Epoch of Reionization Array delay power spectrum pipeline Open
Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different timescales. These can be isolated by designing appropriate Fourier filte…
View article: The BLAST Observatory: A Sensitivity Study for Far-IR Balloon-borne Polarimeters
The BLAST Observatory: A Sensitivity Study for Far-IR Balloon-borne Polarimeters Open
Sensitive wide-field observations of polarized thermal emission from interstellar dust grains will allow astronomers to address key outstanding questions about the life cycle of matter and energy driving the formation of stars and the evol…
View article: Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning
Hydrogen Epoch of Reionization Array (HERA) Phase II Deployment and Commissioning Open
This paper presents the design and deployment of the Hydrogen Epoch of Reionization Array (HERA) phase II system. HERA is designed as a staged experiment targeting 21 cm emission measurements of the Epoch of Reionization. First results fro…
View article: matvis: A matrix-based visibility simulator for fast forward modelling of many-element 21 cm arrays
matvis: A matrix-based visibility simulator for fast forward modelling of many-element 21 cm arrays Open
Detection of the faint 21 cm line emission from the Cosmic Dawn and Epoch of Reionisation will require not only exquisite control over instrumental calibration and systematics to achieve the necessary dynamic range of observations but also…
View article: Bayesian estimation of cross-coupling and reflection systematics in 21cm array visibility data
Bayesian estimation of cross-coupling and reflection systematics in 21cm array visibility data Open
Observations with radio arrays that target the 21-cm signal originating from the early Universe suffer from a variety of systematic effects. An important class of these are reflections and spurious couplings between antennas. We apply a Ha…
View article: Direct Optimal Mapping Image Power Spectrum and its Window Functions
Direct Optimal Mapping Image Power Spectrum and its Window Functions Open
The key to detecting neutral hydrogen during the epoch of reionization (EoR) is to separate the cosmological signal from the dominating foreground radiation. We developed direct optimal mapping (DOM) to map interferometric visibilities; it…
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: Search for the Epoch of Reionization with HERA: upper limits on the closure phase delay power spectrum
Search for the Epoch of Reionization with HERA: upper limits on the closure phase delay power spectrum Open
Radio interferometers aiming to measure the power spectrum of the redshifted 21 cm line during the Epoch of Reionization (EoR) need to achieve an unprecedented dynamic range to separate the weak signal from overwhelming foreground emission…
View article: Characterization of inpaint residuals in interferometric measurements of the epoch of reionization
Characterization of inpaint residuals in interferometric measurements of the epoch of reionization Open
To mitigate the effects of Radio Frequency Interference (RFI) on the data analysis pipelines of 21 cm interferometric instruments, numerous inpaint techniques have been developed. In this paper, we examine the qualitative and quantitative …
View article: Impact of instrument and data characteristics in the interferometric reconstruction of the 21 cm power spectrum
Impact of instrument and data characteristics in the interferometric reconstruction of the 21 cm power spectrum Open
Combining the visibilities measured by an interferometer to form a cosmological power spectrum is a complicated process. In a delay-based analysis, the mapping between instrumental and cosmological space is not a one-to-one relation. Inste…