Validation of the EDGES Low-band Antenna Beam Model

  title={Validation of the EDGES Low-band Antenna Beam Model},
  author={Nivedita Mahesh and Judd D. Bowman and T J Mozdzen and Alan E. E. Rogers and Raul A. Monsalve and S. Murray and David Lewis},
  journal={The Astronomical Journal},
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 antenna with comparisons between models and against data. We find that simulations of a simplified model of the antenna over an infinite perfectly conducting ground plane are, with one exception, robust to changes in the numerical electromagnetic solver code… 

Lunar Orbit Measurement of the Cosmic Dawn’s 21 cm Global Spectrum

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 important

First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum

We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights of data (∼36 hr of integration) from Phase I of the Hydrogen Epoch of Reionization

Effects of model incompleteness on the drift-scan calibration of radio telescopes

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 interferometric and



Foreground model selection for signal parameter estimation

The intrinsic astronomical foreground along a line of sight consists primarily of synchrotron and free-free emission (and some absorption depending on frequency) from our Milky Way Galaxy and any

Holographic beam mapping of the CHIME pathfinder array

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder radio telescope is currently surveying the northern hemisphere between 400 and 800 MHz. By mapping the large scale structure of

Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz

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

Testing for calibration systematics in the EDGES low-band data using Bayesian model selection

  • P. SimsJ. Pober
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2019
Cosmic Dawn (CD), when the first stars and proto-galaxies began to form, is commonly expected to be accompanied by an absorption signature at radio frequencies. This feature arises as Lyman α

The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA

The 21 cm transition of neutral hydrogen is opening an observational window into the Cosmic Dawn of the universe—the epoch of first star formation. We use 28 hr of data from the Owens Valley Radio

First demonstration of ECHO: An external calibrator for hydrogen observatories

Multiple instruments are pursuing constraints on dark energy, observing reionization and opening a window on the dark ages through the detection and characterization of the 21 cm hydrogen line for

A Ground Plane Artifact that Induces an Absorption Profile in Averaged Spectra from Global 21 cm Measurements, with Possible Application to EDGES

Most of the current Global 21 cm experiments include ground screens that help moderate effects from the Earth. In this paper, we report on a possible systematic artifact within the ground plane that

Electromagnetic Simulation Using the FDTD Method

Results from EDGES High-Band. III. New Constraints on Parameters of the Early Universe

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