A diagnostic tool for the identification of Supernova Remnants
| Autor: | I. Leonidaki, Andreas Zezas, M. Kopsacheili |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
3d surfaces 010308 nuclear & particles physics Doubly ionized oxygen FOS: Physical sciences Astronomy and Astrophysics Diagnostic tools 01 natural sciences Measure (mathematics) Astrophysics - Astrophysics of Galaxies Flux ratio Combinatorics Supernova Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Beta (velocity) 010303 astronomy & astrophysics Line (formation) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| Popis: | We present new diagnostic tools for distinguishing supernova remnants (SNRs) from HII regions. Up to now, sources with flux ratio [S II]/H$\rm{\alpha}$ higher than 0.4 have been considered as SNRs. Here, we present the combinations of three or two line ratios as more effective tools for the separation of these two kinds of nebulae, depicting them as 3D surfaces or 2D lines. The diagnostics are based on photoionization and shock excitation models (MAPPINGS III) analysed with Support Vector Machine (SVM) models for classification. The line-ratio combination that gives the most efficient diagnostic is: [O I]/H$\rm{\alpha}$ - [O II]/H$\rm{\beta}$ - [O III]/H$\rm{\beta}$. This method gives $98.95\% $ completeness in the SNR selection and $1.20\%$ contamination. We also define the [O I]/H$\rm{\alpha}$ SNR selection criterion and we measure its efficiency in comparison to other selection criteria. Comment: Accepted for publication in the Monthly Notices of the Royal Astronomical Society, 18 pages, 30 figures |
| Databáze: | OpenAIRE |
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