21cm Cosmology

HERA reionization.org

The Hydrogen Epoch of Reionization Array (HERA) is cosmology experiment to directly detect primordial hydrogen dating from the time of the first stars. HERA is a large radio interferometer located in the Karoo desert of South Africa.  At ASU we are contributing in a number of ways but have direct responsibility for the commissioning of the instrument and delivering data products to the collaboration.

ECHO danielcjacobs.com/ECHO

The External Calibrator for Hydrogen Observatories (ECHO) is a drone-mounted calibration source used to map the response of instruments like HERA at the high precision necessary for cosmological observations.

Direct Imaging of Electric Fields

 E-field Parallel Imaging Correlator (EPIC) – Dense arrays are one way to minimize foreground contamination of the 21cm signal.  Full correlation of dipole arrays are also the best way to image the large areas of the sky necessary to survey foregrounds. They also enable significant transient science.  EPIC is an implimentation of a generalized Fast Fourier Transform Telescope that allows for antennas to be positioned arbitrarily and is an important step along the road towards fully correlated arrays with 10s of thousands elements at scalable costs.  
For more see Adam Beardsley’s EPIC page

 

21cm reading for new students

Public Level: Loeb 2011

High level student level: Pritchard and Loeb, 2012

The theory bible: Furlanetto, Oh, and Briggs, 2006

Many more instrumentation papers by myself and collaborators listed on the HERA web site.  See Deboer et al 2016 for a description of HERA.

 

Tutorials

champ_imaging_tutorial  – Updated 19 Feb 2019

HERA Crash Course @ ASU Slide Deck 

Space Missions

SPARCS – A mission to measure the UV flare environment of M-dwarf stars.  SPARCS is a 6U UV space telescope. I’m helping build the spacecraft and operations.

Phoenix – A student led project funded by the NASA USIP program, Phoenix is a 3U cubesat which will image US cities in thermal infrared.