Sökning: "molecular cloud"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden molecular cloud.

  1. 1. Extinction in Molecular Clouds : Case of Barnard 335

    Författare :Sven Olofsson; Göran Olofsson; Kalevi Mattila; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ISM; interstellar medium; extinction; molecular cloud; Astronomy; astronomi; Astronomy; astronomi;

    Sammanfattning : The Bok globule B335 is a small molecular cloud in the solar neighbourhood near the galactic plane. The aim for this three-paper-study is to construct and analyze the extinction for this globule. The method we apply is to use the light from field stars behind the cloud in broadband filters ranging from UV to the mid-infrared. LÄS MER

  3. 2. Astrochemical Investigations of Complex Organics in Cold Molecular Cloud Cores

    Författare :Tadeus Carl; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; astrobiology; astrochemistry; ISM – molecular clouds; ISM – molecules; dark clouds;

    Sammanfattning : Astrochemistry is the study of the formation and evolution of molecules in the interstellar medium (ISM) of the Milky Way and other galaxies. Molecules start to accumulate in the coldest and densest regions of the ISM, namely molecular clouds, and as of this date, 307 interstellar molecules are identified. LÄS MER

  4. 3. Ions colliding with molecules and molecular clusters : fragmentation and growth processes

    Författare :Tao Chen; Henrik Cederquist; Hutton Roger; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PAH; H2; C60; fragmentation; fysik; Physics;

    Sammanfattning : In this work we will discuss fragmentation and molecular growth processes in collisions of Polycyclic Aromatic Hydrocarbon (PAH) molecules, fullerenes, or their clusters with atoms or atomic ions. Simple collision models as well as molecular structure calculations are used to aid the interpretations of the present and other experimental results. LÄS MER

  5. 4. Molecular-Level Investigations of Water-Organic Systems of Atmospheric Relevance

    Författare :Sofia M. Johansson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; EMB method; desorption kinetics; water uptake; organic surfaces;

    Sammanfattning : It is known that aerosol particles may have warming and/or cooling effects on the climate and negative health effects that depend on their chemical and physical properties. However, current understanding of atmospheric particles’ effects is poor due to the diversity of their constituents and associated variations in properties. LÄS MER

  7. 5. Millimetre-wave observations of the Sgr B2 molecular cloud

    Författare :Albert Nummelin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER