Sökning: "ISM"
Visar resultat 1 - 5 av 71 avhandlingar innehållade ordet ISM.
1. Satellite and ground based observations of massive star forming regions
Sammanfattning : Results from submm/mm radio astronomical observations, using the astronomy/-aeronomy satellite Odin and the 20m telescope at the Onsala Space Observatory, are presented. Analysis of spectroscopic data of interstellar rotational emission lines from gaseous H2O residing in giant molecular clouds (GMCs), reveal important new clues about the chemistry and spatial distribution of water molecules in these regions, including estimates of the water abundance in molecular outflows associated with massive star formation. LÄS MER
2. How ISM properties drive Lyman Continuum Escape
Sammanfattning : The thesis introduces physical processes that are at work in astrophysical plasmas and reviews the current state of research related to the emission of ionizing photons, i.e. Lyman continuum (LyC). Star forming galaxies and active galactic nuclei are discussed as sources of LyC. LÄS MER
3. Impact of feedback on the ISM of extreme starburst galaxies : The case of Haro 11
Sammanfattning : Blue compact galaxies (BCGs) are compact, metal-poor, starbursting galaxies with characteristics similar to what is expected for the young high-redshifted galaxies. BCGs are among the most active in producing a large number of massive star clusters, each containing thousands of massive stars. LÄS MER
4. Evaluating the ISM code using port state control statistics
Sammanfattning : The history of modern maritime safety legislation at the international level is relatively young. Its beginnings are generally associated with the sinking of the Titanic in 1912, a tragedy that resulted in the adoption by an international conference of the first of what was to become a series of versions (1914, 1929, 1948, 1960, 1974) of the International Convention for the Safety of Life at Sea (SOLAS). LÄS MER
5. Studies in Molecular Astrophysics and Astrobiology
Sammanfattning : The molecules of the interstellar medium (ISM) can be used as probes of the physical conditions in a range of different types of interstellar environment, for example star forming regions. The first chapters of this thesis describe the theory and the observational techniques used to study the rotational transition emission from, and the present knowledge of, these molecules. LÄS MER