Sökning: "galaxies: ISM"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden galaxies: ISM.

  1. 1. Water and hydroxyl in luminous infrared galaxies: Spectroscopic observations and modelling

    Författare :Niklas Falstad; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ISM: molecules; Galaxies: individual: Zw 049.057; Line: formation; Galaxies: ISM; Submillimeter: galaxies; Infrared: galaxies;

    Sammanfattning : Many luminous infrared galaxies (LIRGs) contain compact obscured nuclei (CONs) where luminosities in excess of 10^9 Lsun emerge from inside dusty regions smaller than 100 pc in diameter. Due to the obscuring material in these regions, the nature of the nuclear power source cannot be determined using direct observations in the optical or IR. LÄS MER

  2. 2. Multi frequency interferometer studies of active and starburst galaxies

    Författare :Evert Olsson; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; galaxies: active; galaxies: ISM; galaxies: starburst; galaxies: evolution;

    Sammanfattning : We report the results of a multi-frequency study of three interactinggalaxies: NGC 5218, NGC 1614 and NGC 4194 (the Medusa merger). These sourcesbelong to different classes of active and starburst galaxies. LÄS MER

  3. 3. Molecular observations of obscured galaxy nuclei

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Niklas Falstad; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Galaxies: nuclei; Galaxies: ISM; Infrared: galaxies; ISM: Molecules; Submillimeter: galaxies;

    Sammanfattning : It is becoming evident that some (ultra)luminous infrared galaxies ((U)LIRGs) contain compact obscured nuclei (CONs) where luminosities in excess of 10^9 L☉  emerge from inside dusty regions smaller than 100 pc in diameter. Due to the obscured nature of these objects, their inner regions are hidden from examination using optical or infrared lines. LÄS MER

  4. 4. How ISM properties drive Lyman Continuum Escape

    Detta är en avhandling från Stockholm : Johannes Puschnig

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

    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

  5. 5. The violent ISM in Haro 11

    Detta är en avhandling från Stockholm : Department of Astronomy, Stockholm University

    Författare :Veronica Menacho; Stockholms universitet.; Stockholms universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; astronomi;

    Sammanfattning : This thesis introduces briefly physical processes operating in the ISM around massive starsand focuses on the impact strong stellar feedback has in creating large-scale structures in a galaxy.Stellar feedback is ubiquitous in star forming galaxies and its effect on the ISM depends strongly on the energy output from the most massive stars (M$\geq$7 \Mo ) and the properties of the surrounding gas. LÄS MER