Université de GenèveDépartement de Physique ThéoriqueCAP Genève

The Hydrogen Intensity and Real-time Analysis eXperiment: 256-Element Array Status and Overview

28. September 2021
Cite as: 
D. Crichton et. al., J. Astron. Telesc. Instrum. Syst. 8(1) 011019 (12 January 2022) [arXiv:2109.13755].

The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio interferometer array currently in development, with an initial 256-element array to be deployed at the South African Radio Astronomy Observatory (SARAO) Square Kilometer Array (SKA) site in South Africa. Each of the 6m, f/0.23 dishes will be instrumented with dual-polarisation feeds operating over a frequency range of 400-800 MHz. Through intensity mapping of the 21 cm emission line of neutral hydrogen, HIRAX will provide a cosmological survey of the distribution of large-scale structure over the redshift range from 0.775 to 2.55 over 15,000 square degrees of the southern sky. The statistical power of such a survey is sufficient to produce 7 percent constraints on the dark energy equation of state parameter when combined with measurements from the Planck satellite. Additionally, HIRAX will provide a highly competitive platform for radio transient and HI absorber science while enabling a multitude of cross-correlation studies. In this paper, we describe the science goals of the experiment, overview of the design and status of the sub-components of the telescope system, and describe the expected performance of the initial 256-element array as well as the planned future expansion to the final, 1024-element array.


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