Calibrating CHIME, A New Radio Interferometer to Probe Dark Energy
Laura B. Newburgh, Graeme E. Addison, Mandana Amiri, Kevin Bandura, J., Richard Bond, Liam Connor, Jean-Fran\c{c}ois Cliche, Greg Davis, Meiling, Deng, Nolan Denman, Matt Dobbs, Mateus Fandino, Heather Fong, Kenneth Gibbs,, Adam Gilbert, Elizabeth Griffin, Mark Halpern
TL;DR
This paper discusses the calibration of CHIME, a new radio interferometer designed to map neutral hydrogen and measure baryon acoustic oscillations to probe dark energy, including the development of a pathfinder for testing calibration methods.
Contribution
It introduces a calibration scheme for CHIME and describes instrumentation developed to meet calibration requirements, advancing radio interferometry for cosmology.
Findings
Pathfinder CHIME constrains BAO power spectrum.
Calibration scheme tested on pathfinder.
Instrumentation meets calibration accuracy needs.
Abstract
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a transit interferometer currently being built at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC, Canada. We will use CHIME to map neutral hydrogen in the frequency range 400 -- 800\,MHz over half of the sky, producing a measurement of baryon acoustic oscillations (BAO) at redshifts between 0.8 -- 2.5 to probe dark energy. We have deployed a pathfinder version of CHIME that will yield constraints on the BAO power spectrum and provide a test-bed for our calibration scheme. I will discuss the CHIME calibration requirements and describe instrumentation we are developing to meet these requirements.
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