Issue |
A&A
Volume 689, September 2024
|
|
---|---|---|
Article Number | A325 | |
Number of page(s) | 9 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361/202450539 | |
Published online | 23 September 2024 |
Argon X-ray absorption in the local interstellar medium
1
Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, Germany
2
Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA
3
Department of Computer Engineering, Hasan Kalyoncu University, 27100 Sahinbey, Gaziantep, Turkey
4
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Received:
29
April
2024
Accepted:
4
August
2024
We present the first comprehensive analysis of the argon K-edge absorption region (3.1–4.2 Å) using high-resolution HETGS Chandra spectra of 33 low-mass X-ray binaries. Utilizing R-matrix theory, we computed new K photoabsorption cross sections for Ar I–Ar XVI species. For each X-ray source, we estimated column densities for the Ar I, Ar II, Ar III, Ar XVI, Ar XVII, and Ar XVIII ions, which trace the neutral, warm, and hot components of the gaseous Galactic interstellar medium. We examined their distribution as a function of Galactic latitude, longitude, and distances to the sources. However, no significant correlations were discerned among distances, Galactic latitude, or longitude. Future X-ray observatories will allow us to benchmark the atomic data as the main resonance lines will be resolved.
Key words: ISM: atoms / ISM: structure / local insterstellar matter / X-rays: ISM
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model.
Open Access funding provided by Max Planck Society.
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