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Measurement of All-sky Neutral hydrogen Absorption Spectrum (MANAS)
Vinand Prayag, Nivedita Mahesh, Gregg Hallinan +7
MANAS is a single antenna, ground-based platform built to measure the sky averaged ('global') redshifted 21-cm signal from Cosmic Dawn. The cosmological signal is expected as a ~ 1…
A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology
Peter H. Sims, Steven G. Murray, Judd D. Bowman +8
Comparing composite models for multi-component observational data is a prevalent scientific challenge. When fitting composite models, there exists the potential for systematics fro…
21 cm Intensity Mapping with the DSA-2000
Ruby Byrne, Nivedita Mahesh, Gregg W. Hallinan +3
Line intensity mapping is a promising probe of the universe's large-scale structure. We explore the sensitivity of the DSA-2000, a forthcoming array consisting of over 2000 dishes,…
The Impact of Beam Variations on Power Spectrum Estimation for 21 cm Cosmology II: Mitigation of Foreground Systematics for HERA
Honggeun Kim, Nicholas S. Kern, Jacqueline N. Hewitt +7
One key challenge in detecting 21 cm cosmological signal at z > 6 is to separate the cosmological signal from foreground emission. This can be studied in a power spectrum space whe…
Fitting and Comparing Galactic Foreground Models for Unbiased 21-cm Cosmology
Joshua J. Hibbard, David Rapetti, Jack O. Burns +2
Accurate detection of the cosmological 21-cm global signal requires galactic foreground models which can remove power over ~. Although foreground and global signal models una…
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…
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…
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…
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…