Search for dissertations about: "escape fraction"

Showing result 1 - 5 of 13 swedish dissertations containing the words escape fraction.

  1. 1. On the Escape of Lyman Radiation from Local Galaxies

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Elisabet Leitet; Uppsala universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Galaxies; starbursts; spiral galaxies; Lyman continuum; Lyman alpha; leakage; cosmic reionization; escape fraction; Astronomy; Astronomi;

    Abstract : Cosmic reionization was most likely initiated by star forming dwarf galaxies. Little is known about the physical mechanisms allowing ionizing Lyman continuum (LyC) photons to escape from galaxies, but to learn more we can study local galaxies in detail. READ MORE

  2. 2. Low-Energy Ion Escape from the Terrestrial Polar Regions

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Erik Engwall; Uppsala universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; space physics; ion outflow; polar wind; auroral upflows; atmospheric escape; magnetotail lobes; spacecraft wake; electric field measurements; NATURAL SCIENCES Physics Geocosmophysics and plasma physics; NATURVETENSKAP Fysik Geokosmofysik och plasmafysik; Space and Plasma Physics; rymd- och plasmafysik;

    Abstract : The contemporary terrestrial atmosphere loses matter at a rate of around 100,000 tons per year. A major fraction of the net mass loss is constituted by ions, mainly H+ and O+, which escape from the Earth’s ionosphere in the polar regions. READ MORE

  3. 3. How ISM properties drive Lyman Continuum Escape

    University dissertation from Stockholm : Johannes Puschnig

    Author : Johannes Puschnig; Stockholms universitet.; Stockholms universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Astrophysics; Cosmology; Extragalactics; Reionization; Lyman Continuum; Interstellar Medium; ISM; Tololo 1247-232; Astronomy; astronomi;

    Abstract : 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. READ MORE

  4. 4. Observing Lyman alpha emitters - How does Lyman alpha escape from galaxies?

    University dissertation from Stockholm : Department of Astronomy, Stockholm University

    Author : Andreas Sandberg; Stockholms universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy; astronomi;

    Abstract : The Lyman alpha (Lyα) emission line has grown to become one of the most successful tools for finding galaxies at high redshift. At redshifts corresponding to the early cosmic times of reionization and primeval galaxy formation, the wavelength of Lyα is still accessible with ground-based facilities. READ MORE

  5. 5. Recognition by and escape from CD8+ T cell immune surveillance in cancer bearing hosts

    University dissertation from Stockholm : Karolinska Institutet, false

    Author : Koji Kono; Karolinska Institutet.; Karolinska Institutet.; [1997]

    Abstract : CD8+ T cells ( TCD8+ ) can specifically recognize tumor cells through MHC class I molecules associated with peptides that are 8-l0 amino acid residues long. In recent years, a number of tumor-associated antigens, or their epitopes, have been identified and charactenzed with the advent of new methods in molecular biology and in peptide isolation. READ MORE