Dust grain chemistry in the diffuse ISM towards the black hole transient GX 339-4
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arXiv
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2026
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| author | Psaradaki, I. Corrales, L. Costantini, E. Draghis, P. García, J. A. Gatuzz, E. Kosec, P. Mastroserio, G. Mehdipour, M. Paerels, F. Rogantini, D. Schulz, N. Zeegers, S. |
| author_facet | Psaradaki, I. Corrales, L. Costantini, E. Draghis, P. García, J. A. Gatuzz, E. Kosec, P. Mastroserio, G. Mehdipour, M. Paerels, F. Rogantini, D. Schulz, N. Zeegers, S. |
| contents | We present results on X-ray absorption and the dust grain chemistry in the diffuse interstellar medium (ISM), based on a new Cycle 25 Chandra High Energy Transmission Grating Spectrometer (HETGS) observational campaign targeting the black hole transient GX 339-4. The X-ray source offers an optimal combination of moderate hydrogen column density and high X-ray flux, enabling the first detailed simultaneous fitting of the photoabsorption edges of Fe, O, Si, and Mg which are key elemental constituents of interstellar dust. We performed a joint spectral analysis of Chandra/HETGS data and archival observations from the Reflection Grating Spectrometer (RGS) on board XMM-Newton. We found that the dust grain chemical composition along this diffuse Galactic line of sight is best described by the silicate Mg-rich amorphous pyroxene (Mg0.75Fe0.25SiO3) and metallic iron. We also discuss the elemental abundances and depletions of Fe, O, Si, and Mg, and the presence of absorption features in the X-ray spectrum of this source associated with highly ionised plasma. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_28947 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dust grain chemistry in the diffuse ISM towards the black hole transient GX 339-4 Psaradaki, I. Corrales, L. Costantini, E. Draghis, P. García, J. A. Gatuzz, E. Kosec, P. Mastroserio, G. Mehdipour, M. Paerels, F. Rogantini, D. Schulz, N. Zeegers, S. High Energy Astrophysical Phenomena We present results on X-ray absorption and the dust grain chemistry in the diffuse interstellar medium (ISM), based on a new Cycle 25 Chandra High Energy Transmission Grating Spectrometer (HETGS) observational campaign targeting the black hole transient GX 339-4. The X-ray source offers an optimal combination of moderate hydrogen column density and high X-ray flux, enabling the first detailed simultaneous fitting of the photoabsorption edges of Fe, O, Si, and Mg which are key elemental constituents of interstellar dust. We performed a joint spectral analysis of Chandra/HETGS data and archival observations from the Reflection Grating Spectrometer (RGS) on board XMM-Newton. We found that the dust grain chemical composition along this diffuse Galactic line of sight is best described by the silicate Mg-rich amorphous pyroxene (Mg0.75Fe0.25SiO3) and metallic iron. We also discuss the elemental abundances and depletions of Fe, O, Si, and Mg, and the presence of absorption features in the X-ray spectrum of this source associated with highly ionised plasma. |
| title | Dust grain chemistry in the diffuse ISM towards the black hole transient GX 339-4 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2605.28947 |