TL;DR
This paper reviews how emission lines can be used to diagnose physical conditions in astrophysical objects, discussing empirical methods, modeling, and unresolved questions.
Contribution
It provides a comprehensive overview of emission line diagnostics, combining empirical approaches with photoionization models and highlighting open questions.
Findings
Emission lines serve as key diagnostics for astrophysical plasmas.
Photoionization models help interpret emission line data.
The paper lists useful emission lines and discusses analysis techniques.
Abstract
1 Generalities 2 Empirical diagnostics based on emission lines 3 Photoionization modelling 4 Pending questions 5 Appendix: Lists of useful lines and how to deal with them
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