Addendum: Precision in high resolution absorption line modelling, analytic Voigt derivatives, and optimisation methods [IMA]

http://arxiv.org/abs/2112.14490


The parent paper to this Addendum describes the optimisation theory on which VPFIT, a non-linear least-squares program for modelling absorption spectra, is based. In that paper, we show that Voigt function derivatives can be calculated analytically using Taylor series expansions and look-up tables, for the specific case of one column density parameter for each absorption component. However, in many situations, modelling requires more complex parameterisation, such as summed column densities over a whole absorption complex, or common pattern relative ion abundances. This Addendum provides those analytic derivatives.

Read this paper on arXiv…

C. Lee, J. Webb and R. Carswell
Thu, 30 Dec 21
46/71

Comments: 4 pages, 2 figures. Submitted to MNRAS 23 Dec 2021, accepted 24 Dec 2021