A. E. E. Rogers
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View article: A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors – II. Model priors and posterior odds
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors – II. Model priors and posterior odds Open
The reliable detection of the global 21-cm signal, a key tracer of Cosmic Dawn and the Epoch of Reionization, requires meticulous data modelling and robust statistical frameworks for model validation and comparison. In Paper I of this seri…
View article: A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology
A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology Open
Comparing composite models for multicomponent observational data is a prevalent scientific challenge. When fitting composite models, there exists the potential for systematics from a poor fit of one model component to be absorbed by anothe…
View article: A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- II. Model priors and posterior odds
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- II. Model priors and posterior odds Open
The reliable detection of the global 21-cm signal, a key tracer of Cosmic Dawn and the Epoch of Reionization, requires meticulous data modelling and robust statistical frameworks for model validation and comparison. In Paper I of this seri…
View article: A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology
A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology Open
Comparing composite models for multi-component observational data is a prevalent scientific challenge. When fitting composite models, there exists the potential for systematics from a poor fit of one model component to be absorbed by anoth…
View article: Low-frequency Radio Recombination Lines Away from the Inner Galactic Plane
Low-frequency Radio Recombination Lines Away from the Inner Galactic Plane Open
Diffuse radio recombination lines (RRLs) in the Galaxy are possible foregrounds for redshifted 21 cm experiments. We use EDGES drift scans centered at −26.°7 decl. to characterize diffuse RRLs across the southern sky. We find that RRLs ave…
View article: A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors – I. Mathematical formalism
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors – I. Mathematical formalism Open
Accurately accounting for spectral structure in spectrometer data induced by instrumental chromaticity on scales relevant for detection of the 21-cm signal is among the most significant challenges in global 21-cm signal analysis. In the pu…
View article: Low-Frequency Radio Recombination Lines Away From the Inner Galactic Plane
Low-Frequency Radio Recombination Lines Away From the Inner Galactic Plane Open
Diffuse radio recombination lines (RRLs) in the Galaxy are possible foregrounds for redshifted 21~cm experiments. We use EDGES drift scans centered at $-26.7^o$~declination to characterize diffuse RRLs across the southern sky. We find RRLs…
View article: Analytic approximations of scattering effects on beam chromaticity in 21-cm global experiments
Analytic approximations of scattering effects on beam chromaticity in 21-cm global experiments Open
Scattering from objects near an antenna produce correlated signals from strong compact radio sources in a manner similar to those used by the Sea Interferometer to measure the radio source positions using the fine frequency structure in th…
View article: A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- I. Mathematical formalism
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- I. Mathematical formalism Open
Accurately accounting for spectral structure in spectrometer data induced by instrumental chromaticity on scales relevant for detection of the 21-cm signal is among the most significant challenges in global 21-cm signal analysis. In the pu…
View article: Analytic Approximations of Scattering Effects on Beam Chromaticity in 21‐cm Global Experiments
Analytic Approximations of Scattering Effects on Beam Chromaticity in 21‐cm Global Experiments Open
Scattering from objects near an antenna produce correlated signals from strong compact radio sources in a manner similar to those used by the “Sea Interferometer” to measure the radio source positions using the fine frequency structure in …
View article: A Bayesian Calibration Framework for EDGES
A Bayesian Calibration Framework for EDGES Open
We develop a Bayesian model that jointly constrains receiver calibration, foregrounds and cosmic 21cm signal for the EDGES global 21\,cm experiment. This model simultaneously describes calibration data taken in the lab along with sky-data …
View article: Sporadic mesenteric desmoid-type fibromatosis with “double-hit” T41A and S45P beta-catenin mutation profile: a case report of an extremely rare event—clinically relevant or much ado about nothing?
Sporadic mesenteric desmoid-type fibromatosis with “double-hit” T41A and S45P beta-catenin mutation profile: a case report of an extremely rare event—clinically relevant or much ado about nothing? Open
Background: Desmoid tumor is a rare non metastasizing neoplasm arising from fascial or deep musculoaponeurotic tissue. Sporadic desmoid tumors are characterized by mutations in the gene-encoding beta-catenin (CTNNB1), in up to 85% of cases…
View article: Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere
Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere Open
Ground-based observations of 11.072 GHz atmospheric ozone (O3) emission have been made using the Ny-Ålesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (latitude 78∘55′0′′ N, longitude 11∘55′59′′ E), Spitsb…
View article: Comparison of ground-based 11.072 GHz microwave observations of Arctic polar MLT ozone with SABER datasets
Comparison of ground-based 11.072 GHz microwave observations of Arctic polar MLT ozone with SABER datasets Open
<p>Ground-based observations of the ozone (O<sub>3</sub>) emission line at 11.072&#160;GHz have been made using the Ny &#197;lesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (lat…
View article: Comment on amt-2021-339
Comment on amt-2021-339 Open
Abstract. Ground-based observations of 11.072âGHz atmospheric ozone (O3) emission have been made using the Ny-à lesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (latitude 78â55â²0â²â²âN, longitud…
View article: Comment on amt-2021-339
Comment on amt-2021-339 Open
Abstract. Ground-based observations of 11.072âGHz atmospheric ozone (O3) emission have been made using the Ny-à lesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (latitude 78â55â²0â²â²âN, longitud…
View article: Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere
Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere Open
Ground based observations of 11.072 GHz atmospheric ozone (O3) emission have been made using the Ny Ålesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (latitude 78°55’0” N, longitude 11°55’59” E), Spitsber…
View article: Validation of the EDGES Low-band Antenna Beam Model
Validation of the EDGES Low-band Antenna Beam Model Open
The response of the antenna is a source of uncertainty in measurements with the Experiment to Detect the Global Epoch of Reionization Signature (EDGES). We aim to validate the electromagnetic beam model of the low-band (50–100 MHz) dipole …
View article: Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz
Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz Open
We use measurements from the Experiment to Detect the Global EoR Signature (EDGES) to determine scale and zero-level corrections to the diffuse radio surveys by Guzmán et al. at 45 MHz and by Landecker & Wielebinski at 150 MHz. We find tha…
View article: Results from EDGES High-Band. III. New Constraints on Parameters of the Early Universe
Results from EDGES High-Band. III. New Constraints on Parameters of the Early Universe Open
We present new constraints on parameters of cosmic dawn and the epoch of reionization derived from the EDGES High-Band spectrum (90–190 MHz). The parameters are probed by evaluating global 21 cm signals generated with the recently develope…
View article: Dark Cosmology: Investigating Dark Matter & Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum
Dark Cosmology: Investigating Dark Matter & Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum Open
The Dark Ages, probed by the redshifted 21-cm signal, is the ideal epoch for a new rigorous test of the standard LCDM cosmological model. Divergences from that model would indicate new physics, such as dark matter decay (heating) or baryon…
View article: Spectral index of the diffuse radio background between 50 and 100 MHz
Spectral index of the diffuse radio background between 50 and 100 MHz Open
We report the spectral index of diffuse radio emission between 50 and 100 MHz\nfrom data collected with two implementations of the Experiment to Detect the\nGlobal EoR Signature (EDGES) low-band system. EDGES employs a wide beam\nzenith-po…
View article: Results from EDGES High-band. I. Constraints on Phenomenological Models for the Global 21 cm Signal
Results from EDGES High-band. I. Constraints on Phenomenological Models for the Global 21 cm Signal Open
We report constraints on the global 21 cm signal due to neutral hydrogen at redshifts . We derive our constraints from low-foreground observations of the average sky brightness spectrum conducted with the EDGES High-band instrument b…
View article: CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 cm SIGNATURE FROM THE EPOCH OF REIONIZATION
CALIBRATION OF THE EDGES HIGH-BAND RECEIVER TO OBSERVE THE GLOBAL 21 cm SIGNATURE FROM THE EPOCH OF REIONIZATION Open
The EDGES High-Band experiment aims to detect the sky-average brightness temperature of the 21 cm signal from the epoch of reionization in the redshift range . To probe this redshifted signal, EDGES High-Band conducts single-antenna measur…
View article: FOREGROUNDS IN WIDE-FIELD REDSHIFTED 21 cm POWER SPECTRA
FOREGROUNDS IN WIDE-FIELD REDSHIFTED 21 cm POWER SPECTRA Open
Detection of 21 cm emission of H i from the epoch of reionization, at redshifts z > 6, is limited primarily by foreground emission. We investigate the signatures of wide-field measurements and an all-sky foreground model using the delay sp…
View article: Improved measurement of the spectral index of the diffuse radio background between 90 and 190 MHz
Improved measurement of the spectral index of the diffuse radio background between 90 and 190 MHz Open
We report absolutely calibrated measurements of diffuse radio emission\nbetween 90 and 190 MHz from the Experiment to Detect the Global EoR Signature\n(EDGES). EDGES employs a wide beam zenith-pointing dipole antenna centred on a\ndeclinat…