HfS, Hyperfine Structure Fitting Tool

Hyperfine Structure Fitting (HfS) is a tool to fit the hyperfine structure of spectral lines with multiple velocity components. The HfS_nh3 procedures included in HfS simultaneously fit the hyperfine structure of the NH₃ (J, K) = (1, 1) and (2, 2) transitions, and perform a standard analysis to derive {T}_{ex}, NH₃ column density, {T}_{rot}, and {T}_{{k}}. HfS uses a Monte Carlo approach for fitting the line parameters. Special attention is paid to the derivation of the parameter uncertainties. HfS includes procedures that make use of parallel computing for fitting spectra from a data cube.