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Atomic Data Assessment with PyNeb

Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada 22860, Mexico
Instituto de Astrofísica de Canarias, La Laguna, E-38205 Tenerife, Spain
Departmento de Astrofísica, Universidad de La Laguna, La Laguna, E-38206 Tenerife, Spain
Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA
Venezuelan Institute for Scientific Research (IVIC), Caracas 1020, Venezuela
Author to whom correspondence should be addressed.
Received: 31 July 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 4 October 2020
(This article belongs to the Special Issue Development and Perspectives of Atomic and Molecular Databases)
PyNeb is a Python package widely used to model emission lines in gaseous nebulae. We take advantage of its object-oriented architecture, class methods, and historical atomic database to structure a practical environment for atomic data assessment. Our aim is to reduce the uncertainties in the parameter space (line ratio diagnostics, electron density and temperature, and ionic abundances) arising from the underlying atomic data by critically selecting the PyNeb default datasets. We evaluate the questioned radiative-rate accuracy of the collisionally excited forbidden lines of the N- and P-like ions (O ii, Ne iv, S ii, Cl iii, and Ar iv), which are used as density diagnostics. With the aid of observed line ratios in the dense NGC 7027 planetary nebula and careful data analysis, we arrive at emissivity ratio uncertainties from the radiative rates within 10%, a considerable improvement over a previously predicted 50%. We also examine the accuracy of an extensive dataset of electron-impact effective collision strengths for the carbon isoelectronic sequence recently published. By estimating the impact of the new data on the pivotal [N ii] and [O iii] temperature diagnostics and by benchmarking the collision strength with a measured resonance position, we question their usefulness in nebular modeling. We confirm that the effective-collision-strength scatter of selected datasets for these two ions does not lead to uncertainties in the temperature diagnostics larger than 10%. View Full-Text
Keywords: nebular modeling; astrophysical software; plasma diagnostics; atomic databases; atomic data assessment nebular modeling; astrophysical software; plasma diagnostics; atomic databases; atomic data assessment
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MDPI and ACS Style

Morisset, C.; Luridiana, V.; García-Rojas, J.; Gómez-Llanos, V.; Bautista, M.; Mendoza, C. Atomic Data Assessment with PyNeb. Atoms 2020, 8, 66.

AMA Style

Morisset C, Luridiana V, García-Rojas J, Gómez-Llanos V, Bautista M, Mendoza C. Atomic Data Assessment with PyNeb. Atoms. 2020; 8(4):66.

Chicago/Turabian Style

Morisset, Christophe, Valentina Luridiana, Jorge García-Rojas, Verónica Gómez-Llanos, Manuel Bautista, and Claudio Mendoza. 2020. "Atomic Data Assessment with PyNeb" Atoms 8, no. 4: 66.

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