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Concerns about Modelling of the EDGES Data
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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 surrounding gas, which causes the 21-cm line to appear in absorption against the cosmic microwave background. Bowman et al. 2018 identified a broad flat-bottomed absorption profile centred at 78 MHz, which could be this feature, although the depth of the profile is much larger than expected. We have examined the modelling process they used and find that their data implies unphysical parameters for the foreground emission and also that their solution is not unique in the sense that we found other simple formulations for the signal that are different in shape but that also fit their data. We argue that this calls into question the interpretation of these data as an unambiguous detection of the cosmological 21-cm absorption signature.
Forward citations
Cited by 3 Pith papers
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Impact of numerical stability in Bayesian noise wave calibration on global 21-cm experiments
Near-collinearity of noise-source and load design-matrix columns makes REACH’s five-parameter Bayesian calibration non-reproducible; a four-parameter Chebyshev fit with hot-load T_NS(ν) recovery and spike masking stab...
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PRATUSH experiment concept and design overview
A concept and design study for a lunar-orbiting radiometer for the global 21-cm cosmic dawn signal, with simulations indicating detection sensitivity for standard models.
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Axion-Photon Conversion in FLRW with Primordial Magnetic Fields: Explaining the Radio Excess
Resonant conversion of axion-like particles into photons in nanogauss primordial magnetic fields is claimed to explain both the ARCADE2 radio excess and the EDGES 21-cm trough for axion masses near 10^-14 to 10^-12 eV.
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