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Reverse-Engineering Laboratory Astrophysics: Oxygen Inner-shell Absorption in the ISM
J García1, E Gatuzz2, T R Kallman3
1Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA.
AIP Conference Proceedings
|August 5, 2020
Summary
Advanced X-ray spectral modeling now better describes photoionized astrophysical plasmas. Discrepancies in oxygen absorption lines between observations and lab data highlight the need for improved models of interstellar medium oxygen photoabsorption.
Area of Science:
- Astrophysics
- Plasma Physics
- Atomic Physics
Background:
- Recent advancements in theoretical and numerical frameworks have improved X-ray spectral modeling.
- A reliable atomic database for inner-shell transitions is now available for relevant ions.
Purpose of the Study:
- To discuss developments in X-ray spectral modeling for photoionized astrophysical plasmas.
- To analyze oxygen cold absorption in the interstellar medium (ISM).
- To address discrepancies in neutral oxygen absorption-line positions.
Main Methods:
- Utilizing high-resolution astrophysical observations to determine accurate line positions.
- Adjusting theoretical models for comprehensive interpretation of observed X-ray spectra.
- Comparing observational data with laboratory measurements.
Main Results:
- Identified standing discrepancies in neutral oxygen absorption-line positions.
- Highlighted the need for refined theoretical models based on observational data.
- Demonstrated the utility of astrophysical observations in validating atomic data.
Conclusions:
- Current X-ray spectral models require further refinement, particularly for oxygen photoabsorption.
- The study aims to resolve controversies regarding ISM atomic and molecular fractions.
- Accurate modeling of oxygen photoabsorption is crucial for understanding ISM composition.
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