Papers › AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
AMBER: A Semi-numerical Abundance Matching Box for the Epoch of Reionization
Hy Trac, Nianyi Chen, Ian Holst, Marcelo A. Alvarez, Renyue Cen
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The Abundance Matching Box for the Epoch of Reionization (AMBER) is a semi-numerical code for modeling the cosmic dawn. The new algorithm is not based on the excursion set formalism for reionization, but takes the novel approach of calculating the reionization-redshift field zᵣₑ(x) assuming that hydrogen gas encountering higher radiation intensity are photoionized earlier. Redshift values are assigned while matching the abundance of ionized mass according to a given mass-weighted ionization fraction x̅ᵢ(z). The code has the unique advantage of allowing users to directly specify the reionization history through the redshift midpoint z_(mid), duration Δ_z, and asymmetry A_z input parameters. The reionization process is further controlled through the minimum halo mass Mₘᵢₙ for galaxy formation and the radiation mean free path l_(mfp) for radiative transfer. We implement improved methods for constructing density, velocity, halo, and radiation fields, which are essential components for modeling reionization observables. We compare AMBER with two other semi-numerical methods and find that our code more accurately reproduces the results from radiation-hydrodynamic simulations. The parallelized code is over four orders of magnitude faster than radiative transfer simulations and will efficiently enable large-volume models, full-sky mock observations, and parameter-space studies. AMBER will be made publicly available to facilitate and transform studies of the EoR.
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