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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Interstellar Dust"”.
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Interstellar Dust and Distances to Planetary Nebulae
Made available in DSpace on 2014-12-10T23:45:12Z (GMT). No. of bitstreams: 1 7219872.pdf: 3519216 bytes, checksum: f7ecce761bb4c7dc9bfcbe0d059e9d55 (MD5) Previous issue date: 1972
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Scattering and Absorption of X-rays by Interstellar Dust
In dieser Arbeit habe ich die Eigenschaften der interstellaren Staubpartikel untersucht, wie sie sich aus deren Wechselwirkung mit Roentgen strahlung ergeben. Tatsaechlich werden Photonen, die von einer entfernten Punktquelle stammen, von den Staubteilchen nicht nur absorbiert sondern auch in …
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Investigating Interstellar dust in the Milky Way through X-ray scattering and absorption
Interstellar dust strongly affects astronomical observations across the entire electromagnetic spectrum. In the optical and ultraviolet bands, it produces extinction and reddening that must be corrected for both Galactic and extragalactic sources. At longer wavelengths, its thermal emission …
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Monitoring of the Interstellar Dust Stream in the Inner Solar System Using Data of Different Spacecraft
Interstellar dust plays a key role in many astrophysical processes. However, until recently, astronomers could infer some properties of interstellar dust only through observations of starlight extinction and infrared emission. Therefore, the in-situ detection of interstellar dust, based on …
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Numerically modeling the evolution of dust grains in galaxy formation simulations
… I present the development of various models for dust physics suited for galaxy formation simulations. I begin by introducing a model to evolve the spatial distribution of dust in galaxies, with dust treated as a passive scalar advected according to hydrodynamic flow. This model accounts for …
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The Well-Dressed Spacecraft: Textiles for Cosmic Dust Metrology
… fabric skin for sensing hypervelocity space dust, while simultaneously offering enhanced protective capabilities. Dust kinematic estimates can in turn suggest the grain's likely origin. From space webs on asteroids and `sensory conductors' on extravehicular spacesuits to future 'textile …
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Interpreting the 10um astronomical silicate feature
10pm spectra of silicate dust in the diffuse medium towards Cyg 0B2 no. 12 and towards field and embedded objects in the Taurus Molecular Cloud (TMC) were obtained with CGS3 at the United Kingdom Infrared Telescope (UKIRT). Cold molecular-cloud silicates are sampled in quiescent lines of sight …
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Lyα emission as a sensitive probe of galactic mergers and reionization
… to feedback physics and the structure of the interstellar medium (ISM). We identify several Lyα parameters that reliably predict the escape fraction of Lyman continuum (LyC) photons. • What governs the visibility of high-redshift LAEs? We show that galaxy mergers trigger intense starbursts, …
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Uncovering the Structure of the Galactic Bulge Using Kinematic Data from the JASMINE Near-Infrared Astrometric Satellite
… to astronomers. Due to the high extinction from interstellar dust in the visible band (Aᵥ ≈ 30 mag), it is necessary to study the Galactic Bulge in the Near-Infrared (NIR) band. JASMINE mission is designed to observe the Galactic Nuclear Bulge at the region of 100-300 parsecs from the Galactic …
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Low-Energy Electron Impact Fragmentations of the Polycyclic Aromatic Hydrocarbon Anthracene
… environments, including potentially in the interstellar medium where secondary electrons may be produced by UV-irradiation of interstellar dust grains. An effusive, molecular beam of anthracene, generated in a resistively heated oven, is crossed with a beam of low-energy electrons to form …
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Far-UV to Mid-IR Spectral Energy Distributions of Nearby Merging Galaxies
… for the AGN-merger connection remains uncertain. Interstellar dust, a bi-product of SF, can block much of the light from an AGN and re-radiate that energy at infrared (IR) wavelengths. Therefore, quantifying the amount of buried AGN activity in the IR is key to understanding the role of major …
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On the Chemistry of Molecules Containing Silicon, Phosphorus, and Sulfur in the Interstellar Medium
The Interstellar Medium (ISM) is an extreme environment that requires a wide range of experimental techniques to investigate its many shades. This thesis presents a collection of studies in Laboratory Astrochemistry aimed at providing new experimental data for astrochemical modeling and probing the …
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Supernova shrapnel: nearby supernovae and dust transport in the ISM
… also examine various influences on the path of interstellar dust carrying ^60Fe from a SN through the Heliosphere, with the aim of estimating the final global distribution on the ocean floor. We study the influences of magnetic fields, angle of arrival, wind and ocean cycling of SN material on …
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The effects of dust on the derived photometric parameters of disks and bulges in spiral galaxies
Spiral galaxies contain large amounts of interstellar dust, that absorbs and scatters their photons. This results in strong distortions and changes of their observed stellar images from what would be observed in the absence of the dust. Because of this the measured structural parameters of spiral …
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Probing the Role Played by Magnetic Fields in Star Formation with BLASTPol
… measures linearly polarized Galactic dust emission in order to map magnetic field morphology in nearby molecular clouds. The role played by magnetic fields in providing support against gravitational collapse of clouds and cores and in forming observed cloud morphology is a key …
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Disentangling the chemodynamical history of the Milky Way disc with asteroseismology and spectroscopy
… Because APOGEE is much less affected by interstellar dust extinction, the sample covers the disc regions very close to the Galactic plane that are typically avoided by optical surveys. This allows us to investigate the chemo-kinematic properties of the Milky Way's thin disc outside the …