Interstellar dust along the line of sight of GX 3+1
D. Rogantini (1, 2), E. Costantini, S.T. Zeegers, C.P. de Vries, M., Mehdipour, F. de Groot, H. Mutschke, I. Psaradaki, L.B.F.M. Waters ((1), SRON Netherlands Institute for Space Research, the Netherlands, (2) Anton, Pannekoek Astronomical Institute, University of Amsterdam

TL;DR
This study characterizes interstellar silicate dust along the line of sight to GX 3+1 using X-ray absorption features, revealing dust composition, size distribution, and crystallinity, with implications for understanding cosmic dust properties.
Contribution
It introduces new X-ray extinction models based on synchrotron measurements and applies them to analyze dust properties in a specific Galactic region.
Findings
Up to 70% of dust is amorphous olivine.
Both magnesium and silicon are highly depleted into dust.
The total abundance of Mg and Si remains near solar values.
Abstract
Studying absorption and scattering of X-ray radiation by interstellar dust grains allows us to access the physical and chemical properties of cosmic grains even in the densest regions of the Galaxy. We aim at characterising the dust silicate population which presents clear absorption features in the energy band covered by the Chandra X-ray Observatory. Through these absorption features, in principle, it is possible to infer the size distribution, composition, and structure of silicate in the interstellar medium. In particular, in this work, we investigate the magnesium and silicon K-edges. By using newly acquired synchrotron measurements, we build X-ray extinction models for fifteen dust candidates. These models, adapted for astrophysical analysis, and implemented in the Spex spectral fitting program, are used to reproduce the dust absorption features observed in the spectrum of the…
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