Antenna beam characterization for the global 21-cm experiment LEDA and its impact on signal model parameter reconstruction
M Spinelli, G Kyriakou, G Bernardi… - Monthly Notices of …, 2022 - academic.oup.com
Cosmic dawn, the onset of star formation in the early universe, can in principle be studied
via the 21-cm transition of neutral hydrogen, for which a sky-averaged absorption signal …
via the 21-cm transition of neutral hydrogen, for which a sky-averaged absorption signal …
Lunar orbit measurement of the cosmic dawn's 21 cm global spectrum
Y Shi, F Deng, Y Xu, F Wu, Q Yan… - The Astrophysical …, 2022 - iopscience.iop.org
A redshifted 21 cm line absorption signature is commonly expected from the cosmic dawn
era, when the first stars and galaxies formed. The detailed traits of this signal can provide …
era, when the first stars and galaxies formed. The detailed traits of this signal can provide …
A Bayesian calibration framework for EDGES
We develop a Bayesian model that jointly constrains receiver calibration, foregrounds, and
cosmic 21 cm signal for the EDGES global 21 cm experiment. This model simultaneously …
cosmic 21 cm signal for the EDGES global 21 cm experiment. This model simultaneously …
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors–I. Mathematical formalism
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 …
chromaticity on scales relevant for detection of the 21-cm signal is among the most …
Lost horizon: Quantifying the effect of local topography on global 21 cm cosmology data analysis
We present an investigation of the horizon and its effect on global 21 cm observations and
analysis. We find that the horizon cannot be ignored when modeling low-frequency …
analysis. We find that the horizon cannot be ignored when modeling low-frequency …
Validating Posteriors Obtained by an Emulator When Jointly Fitting Mock Data of the Global 21 cm Signal and High-z Galaxy UV Luminosity Function
Although neural-network-based emulators enable efficient parameter estimation in 21 cm
cosmology, the accuracy of such constraints is poorly understood. We employ nested …
cosmology, the accuracy of such constraints is poorly understood. We employ nested …
Joint constraints on reionization: A framework for combining the global 21 cm signal and the kinetic Sunyaev-Zel'dovich effect
Recent measurements from the CMB and from high-redshift galaxy observations have
placed rough constraints on the midpoint and duration of the epoch of reionization. Detailed …
placed rough constraints on the midpoint and duration of the epoch of reionization. Detailed …
Sky-averaged 21-cm signal extraction using multiple antennas with an SVD framework: the REACH case
A Saxena, PD Meerburg… - Monthly Notices of …, 2023 - academic.oup.com
In a sky-averaged 21-cm signal experiment, the uncertainty of the extracted signal depends
mainly on the covariance between the foreground and 21-cm signal models. In this paper …
mainly on the covariance between the foreground and 21-cm signal models. In this paper …
A general Bayesian framework to account for foreground map errors in global 21-cm experiments
Measurement of the global 21-cm signal during Cosmic Dawn and the Epoch of
Reionization is made difficult by bright foreground emission which is 2–5 orders of …
Reionization is made difficult by bright foreground emission which is 2–5 orders of …
Simulation-based inference of the sky-averaged 21-cm signal from CD-EoR with REACH
The redshifted 21-cm signal from the cosmic dawn and epoch of reionization carries
invaluable information about the cosmology and astrophysics of the early Universe …
invaluable information about the cosmology and astrophysics of the early Universe …