Emission Line Spectrum Analyzer

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What is ELSA?

ELSA is an astrophysics software package for analyzing the spectral data from emission line objects and deriving chemical abundances in those objects. It is written in C and compatible with a wide range of Unix systems. ELSA has numerous features, including easy data acquisitions from logs produced by the IRAF splot task, an exceptionally sophisticated interstellar dereddening correction scheme, a robust implementation of the standard 5-level atom approximation based on Dick Henry’s abun code (Kwitter & Henry, 2001, ApJ, 562, 804) and the ability to produce output tables in  LaTeX format for use in preprints and papers.

ELSA is available for free to researchers in source code form. It includes extensive documentation as well. The latest version can be found on this website. ELSA is in continual development. We greatly appreciate any feedback from users.