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- W2966258832 abstract "The Interstellar Medium (ISM) represents a small fraction of the Milky Way matter, but it plays a fundamental role because it governs the galactic evolution and its structure.Most of the ISM gaseous constituents have been identified through their emission or absorption characteristics, however, the diffuse interstellar bands (or DIBs), still has no counterpart in absorbing species.A favourable situation is the presence of a DIB (with central wavelength 862 nm) within the spectral interval of the Radial Velocity Spectrometer (RVS), one of the instruments of the ESA Gaia mission. The first part of the work presented in this document is directly related to the construction of this future catalog and its potential use.I have developed a profile fitting code adapted to the emph{Gaia} DIB and to the RVS instrument. I estime in my thesis how many DIBs will be measured.The second part of this thesis is related to the three-dimensional (3D) mapping of the ISM. I made the first tomography based on composite data, both extinctions and DIBs and showed this is a viable way. I ran parallel inversions of two extinction and DIB datasets for the same target stars and compared the distributions.The full 3D tomographic inversion technique in this case requires an unrealistically large computing time. I have developed a technique and I have applied it to a new catalog of 30 millions of extinction measurements based on Gaia.Finally, I used ground-based stellar spectra to extracted radial velocities and columns of IS absorbing species and participated to the first step of a kinematic 3D map of the ISM." @default.
- W2966258832 created "2019-08-13" @default.
- W2966258832 creator A5074254349 @default.
- W2966258832 date "2018-11-29" @default.
- W2966258832 modified "2023-10-16" @default.
- W2966258832 title "The Diffuse Interstellar Band GAIA : optimisation of its extraction and use with double stellar and interstellar goal" @default.
- W2966258832 hasPublicationYear "2018" @default.
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