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May 2, 2026SHILAP Revista de lepidopterologíaOpen Access

Silicon, Sulfur, and Iron in the Interstellar Medium: A High-resolution X-Ray Spectral Study of GX 340+0

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Authors

DRDaniele RogantiniCCC. R. CanizaresECElisa Costantini

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Overview

Randomized trial reveals dust and gas composition in the interstellar medium of GX 340+00, highlighting silicate dominance.

Key Points

  • This study aims to characterize the composition and physical state of dust grains and atomic species in high-density regions of the interstellar medium (ISM).
  • Utilized high-resolution X-ray spectroscopy from Chandra/HETG to analyze gas and dust in the ISM along the line of sight to GX 340+00.
  • Examined X-ray absorption fine structure and gas absorption lines to identify and quantify elemental contributions.
  • Simultaneously fitted absorption edges of Si, S, and Fe to reduce degeneracies in dust composition.
  • Amorphous olivine was found to dominate the dust composition, contributing ∼65%, followed by metallic iron (∼19%), and iron sulfides (∼10%).
  • Approximately 74% of Fe is associated with silicates, while sulfur was estimated to have a dust fraction of ∼35%.
  • Detected significant absorption near the Ca and Ar K edges, indicating the need for improved atomic photoabsorption data.

Cite This Study

Rogantini et al. (2026) studied this question.

synapsesocial.com/papers/69f5939871405d493affeb5ehttps://doi.org/10.3847/1538-4357/ae5bb6
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