Calculate electron temperature and electron density using Fe

[payel nandi]

Hi all,

Can we get grids for electron temperature (T_e) and density (n_e) for [Fe II] lines which are in MIR? And how they are good as a tracer of n_e?

Thanks,

Payel

[Christophe Morisset]

Hi Payel,

You can follow the examples given in this Notebook, and produce diagrams involving any line ratio you want, including [FeII] IR lines:

https://github.com/Morisset/PyNeb_devel/blob/master/docs/Notebooks/PyNeb_manual_7.ipynb

You may also find some interest in reading the paper we published in 2023:

Atomic Data Assessment with PyNeb: Radiative and Electron Impact Excitation Rates for [Fe ii] and [Fe iii] 

Mendoza, C., Méndez-Delgado, J. E., Bautista, M., García-Rojas, J., & Morisset, C.

2023, Atoms, 11, 63

ABSTRACT: We use the PyNeb 1.1.16 Python package to evaluate the atomic datasets available for the spectral modeling of [Fe ii] and [Fe iii], which list level energies, A-values, and effective collision strengths. Most datasets are reconstructed from the sources, and new ones are incorporated to be compared with observed and measured benchmarks. For [Fe iii], we arrive at conclusive results that allow us to select the default datasets, while for [Fe ii], the conspicuous temperature dependency on the collisional data becomes a deterrent. This dependency is mainly due to the singularly low critical density of the 3d7a4F9/2 metastable level that strongly depends on both the radiative and collisional data, although the level populating by fluorescence pumping from the stellar continuum cannot be ruled out. A new version of PyNeb (1.1.17) is released containing the evaluated datasets.

ADS URL : https://ui.adsabs.harvard.edu/abs/2023Atoms..11...63M

Hope it helps,

Ch.