X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy

Leiden Repository

X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy

Type: Doctoral Thesis
Title: X-ray spectroscopy of interstellar dust: from the laboratory to the Galaxy
Author: Zeegers, S.T.
Issue Date: 2018-11-01
Keywords: Interstellar dust
X-ray binary
Interstellar medium
Debris disk
Abstract: In this thesis, we present new laboratory data of interstellar dust analogues. These measurements, were transformed to interstellar dust models and were used to fit the spectra of low-mass X-ray binaries located in the Galactic center neighborhood in order to determine the dust properties along those lines of sight. In these spectra, we focus in particular on the Si K-edge. The XAFS features in the Si K-edge offer a range of possibilities to study silicon-bearing dust, such as investigating the crystallinity, abundance and the chemical composition. We also present a study on the prospects of observing carbon, sulfur, and other lower abundance elements (namely Al, Ca, Ti and Ni) present in the interstellar medium using future X-ray instruments. We simulated data of instruments with characteristics of resolution and sensitivity of the Athena, XARM and Arcus concepts. Lastly, we explore the theory of X-ray scattering for a new parameter space where the small angle approach is no longer valid and where the size distribution of the dust includes large (> 1 micron) particles. We apply this theory to the environment of stellar debris disks where such conditions apply. We use as a best test case the debris disk of AU Microscopii.
Promotor: Supervisor: Tielens A.G.G.M. Co-Supervisor: Costantini E.
Faculty: Faculty of Science
University: Leiden University
Uri: urn:isbn:9789402812343
Handle: http://hdl.handle.net/1887/66668

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