Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 411, Issue 2, Pages 955-972Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2010.17731.x
Keywords
methods: numerical; galaxies: high redshift; dark ages, reionization, first stars; diffuse radiation; early Universe; large-scale structure of Universe
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Funding
- NASA [HST-HF-51245.01-A, NAS 5-26555, NNG06GI09G, NNX08AH31G]
- NASA Lunar Science Institute [NNA09DB30A]
- NASA [NNX08AH31G, 100710] Funding Source: Federal RePORTER
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We introduce a powerful seminumeric modelling tool, 21cmfast, designed to efficiently simulate the cosmological 21-cm signal. Our code generates 3D realizations of evolved density, ionization, peculiar velocity and spin temperature fields, which it then combines to compute the 21-cm brightness temperature. Although the physical processes are treated with approximate methods, we compare our results to a state-of-the-art large-scale hydrodynamic simulation, and find good agreement on scales pertinent to the upcoming observations (greater than or similar to 1 Mpc). The power spectra from 21cmfast agree with those generated from the numerical simulation to within 10s of per cent, down to the Nyquist frequency. We show results from a 1-Gpc simulation which tracks the cosmic 21-cm signal down from z = 250, highlighting the various interesting epochs. Depending on the desired resolution, 21cmfast can compute a redshift realization on a single processor in just a few minutes. Our code is fast, efficient, customizable and publicly available, making it a useful tool for 21-cm parameter studies.
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