1.2k citations · 2.8k across the 30 of their papers we have counts for
30 papers
Low-Frequency Radio Recombination Lines Away From the Inner Galactic Plane
Akshatha K. Vydula, Judd D. Bowman, David Lewis +8
Diffuse radio recombination lines (RRLs) in the Galaxy are possible foregrounds for redshifted 21~cm experiments. We use EDGES drift scans centered at ~declination to char…
Analytic approximations of scattering effects on beam chromaticity in 21-cm global experiments
Alan E. E. Rogers, John P. Barrett, Judd D. Bowman +6
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 radi…
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- I. Mathematical formalism
Peter H. Sims, Judd D. Bowman, Nivedita Mahesh +7
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 signif…
The Second Radio Synchrotron Background Workshop: Conference Summary and Report
J. Singal, N. Fornengo, M. Regis +24
We summarize the second radio synchrotron background workshop, which took place June 15-17, 2022 in Barolo, Italy. This meeting was convened because available measurements of the d…
A Bayesian Calibration Framework for EDGES
Steven G. Murray, Judd D. Bowman, Peter H. Sims +5
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 descr…
Effects of model incompleteness on the drift-scan calibration of radio telescopes
Bharat K. Gehlot, Daniel C. Jacobs, Judd D. Bowman +76
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 inter…
Validation of EDGES Low-Band Antenna Beam Model
Nivedita Mahesh, Judd D. Bowman, Thomas J. Mozdzen +4
The response of the antenna is a source of uncertainty in measurements with the Experiment to Detect the Global EoR Signature (EDGES). We aim to validate the beam model of the low-…
Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz
Raul A. Monsalve, Alan E. E. Rogers, Judd D. Bowman +7
We use EDGES measurements to determine scale and zero-level corrections to the diffuse radio surveys by Guzmán et al. at MHz and Landecker & Wielebinski at MHz. We find…
Radio-Frequency Interference at the McGill Arctic Research Station
T. Dyson, H. C. Chiang, E. Egan +7
The frequencies of interest for redshifted 21 cm observations are heavily affected by terrestrial radio-frequency interference (RFI). We identify the McGill Arctic Research Station…
Canada and the SKA from 2020-2030
Kristine Spekkens, Cynthia Chiang, Roland Kothes +57
This white paper submitted for the 2020 Canadian Long-Range Planning process (LRP2020) presents the prospects for Canada and the Square Kilometre Array (SKA) from 2020-2030, focuss…
Emulating the Global 21-cm Signal from Cosmic Dawn and Reionization
Aviad Cohen, Anastasia Fialkov, Rennan Barkana +1
The 21-cm signal of neutral hydrogen is a sensitive probe of the Epoch of Reionization (EoR) and Cosmic Dawn. Currently operating radio telescopes have ushered in a data-driven era…
Discovering the Sky at the Longest Wavelengths with Small Satellite Constellations
Xuelei Chen, Jack Burns, Leon Koopmans +29
Due to ionosphere absorption and the interference by natural and artificial radio emissions, ground observation of the sky at the decameter or longer is very difficult. This unexpl…
Results from EDGES High-Band: III. New Constraints on Parameters of the Early Universe
Raul A. Monsalve, Anastasia Fialkov, Judd D. Bowman +5
We present new constraints on parameters of cosmic dawn and the epoch of reionization derived from the EDGES High-Band spectrum ( MHz). The parameters are probed by evaluat…
Spectral Index of the Diffuse Radio Background Between 50 and 100 MHz
Thomas J. Mozdzen, Nivedita Mahesh, Raul A. Monsalve +2
We report the spectral index of diffuse radio emission between 50 and 100 MHz from data collected with two implementations of the Experiment to Detect the Global EoR Signature (EDG…
An absorption profile centred at 78 megahertz in the sky-averaged spectrum
Judd D. Bowman, Alan E. E. Rogers, Raul A. Monsalve +2
After stars formed in the early Universe, their ultraviolet light is expected, eventually, to have penetrated the primordial hydrogen gas and altered the excitation state of its 21…
Results from EDGES High-Band: II. Constraints on Parameters of Early Galaxies
Raul A. Monsalve, Bradley Greig, Judd D. Bowman +5
We use the sky-average spectrum measured by EDGES High-Band ( MHz) to constrain parameters of early galaxies independent of the absorption feature at ~MHz reported by B…
Concerns about Modelling of the EDGES Data
Richard Hills, Girish Kulkarni, P. Daniel Meerburg +1
It is predicted that the spectrum of radio emission from the whole sky should show a dip arising from the action of the light from the first stars on the hydrogen atoms in the surr…
Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude
A. Ewall-Wice, T. -C. Chang, J. Lazio +3
We estimate the 21 cm Radio Background from accretion onto the first intermediate-mass Black Holes between and . Combining potentially optimistic, but pl…
Results from EDGES High-Band: I. Constraints on Phenomenological Models for the Global cm Signal
Raul A. Monsalve, Alan E. E. Rogers, Judd D. Bowman +1
We report constraints on the global cm signal due to neutral hydrogen at redshifts . We derive our constraints from low foreground observations of the av…
A Space-Based Observational Strategy for Characterizing the First Stars and Galaxies Using the Redshifted 21-cm Global Spectrum
Jack O. Burns, Richard Bradley, Keith Tauscher +19
The redshifted 21-cm monopole is expected to be a powerful probe of the epoch of the first stars and galaxies (). The global 21-cm signal is sensitive to the thermal and i…
Improved Measurement of the Spectral Index of the Diffuse Radio Background Between 90 and 190 MHz
Thomas. J. Mozdzen, Judd. D. Bowman, Raul. A. Monsalve +1
We report absolutely calibrated measurements of diffuse radio emission between 90 and 190 MHz from the Experiment to Detect the Global EoR Signature (EDGES). EDGES employs a wide b…
One-Port Direct/Reverse Method for Characterizing VNA Calibration Standards
Raul A. Monsalve, Alan E. E. Rogers, Thomas J. Mozdzen +1
This paper introduces a one-port method for estimating model parameters of VNA calibration standards. The method involves measuring the standards through an asymmetrical passive ne…
Calibration of the EDGES High-Band Receiver to Observe the Global 21-cm Signature from the Epoch of Reionization
Raul A. Monsalve, Alan E. E. Rogers, Judd D. Bowman +1
The EDGES High-Band experiment aims to detect the sky-average brightness temperature of the -cm signal from the Epoch of Reionization (EoR) in the redshift range $14.8 \gtrsim…
Limits on Foreground Subtraction from Chromatic Beam Effects in Global Redshifted 21 cm Measurements
Thomas J. Mozdzen, Judd D. Bowman, Raul A. Monsalve +1
Foreground subtraction in global redshifted 21 cm measurements is limited by frequency-dependent (chromatic) structure in antenna beam patterns. Chromatic beams couple angular stru…