Research

Our group develops radio instrumentation and conducts astronomical observations to study the evolution of the early Universe and the first stars and galaxies. We also apply our technical experience in large data analysis to study new approaches for helping improve science learning and public outreach. We are currently involved in the following projects:

Ask Dr. Discovery
Ask Dr. Discovery is a partnership between ASU, the Arizona Science Center, and the Arizona Museum of Natural History that aims to use familiar technology, including smartphones and tablets, to address the immediate and pressing challenge of affordable, ongoing, large-scale museum evaluation while encouraging visitors to explore and engage deeply with museum content in astronomy, space science, and natural history.

EDGES
The Experiment to Detect the Global EoR Signature (EDGES) is collaboration between scientists and engineers at ASU, MIT Haystack Observatory, and CSIRO. It enables high-precision measurements of the smoothness of the all-sky radio spectrum between 50 and 200 MHz (6<z<30), placing limits on the global 21 cm contribution to the all-sky spectrum. This approach may yield powerful tests of the radiative histories of the first luminous sources. Browse the latest EDGES data. We are also collaborating with Dr. Ricardo Bustos and students in Chile, who are exploring new radio quiet sites around the Atacama desert region as part of the MARI project — check out their blog (in Spanish).

HERA
The Hydrogen Epoch of Reionization Array (HERA) is under construction in South Africa to enable the first detailed measurements of the redshifted 21cm power spectrum from reionization.

MWA
The Murchison Widefield Array (MWA) aims to characterize spatial fluctuations in the redshifted 21 cm HI emission from the cosmological epoch of reionization through CMB-style statistical measurements of the fluctuation power spectrum and other diagnostics. It is also conducting a large survey of the southern sky for astronomical radio transient sources and investigate the heliosphere through scintillation and Faraday rotation effects to improve the prediction of space weather.

DARE
The Dark Ages Radio Explorer (DARE) is an Explorer mission concept that would take advantage of the pristine radio environment behind the farside of the Moon to probe the global 21 cm spectrum. The mission concept was motivated by research performed as part of the Lunar University Network for Astrophysics Research (LUNAR), a collaboration between many institutions to investigate opportunities for new astrophysical measurements from the lunar surface or orbit.

Software
The E-field Parallel Imaging Correlator (EPIC), based on the MOFF algorithm, is the first generic implementation of a direct imaging correlator for dense, large-N radio arrays. The Precision Radio Interferometer Simulator (PRISim) provides accurate, widefield visibility and delay spectra simulations for low-frequency arrays, including MWA and HERA.