Sökning: "astrophysics"

Visar resultat 1 - 5 av 25 uppsatser innehållade ordet astrophysics.

  1. 1. Electron heating in collisionless shocks observed by the MMS spacecraft

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Martin Svensson; [2018]
    Nyckelord :shocks; MMS; electron; heating; gradient; quasi-perpendicular; scaling; plasma; space;

    Sammanfattning : Shock waves are ubiquitous in space and astrophysics. Shocks transform directed particle flow energy into thermal energy. As the major part of space is a collisionless medium, shocks in space physics arises through wave-particle interactions with the magnetic field as the main contributor.The heating processes are scale dependent. LÄS MER

  2. 2. The impact of turbulence on supernovae shockwaves

    Kandidat-uppsats, Lunds universitet/Astronomi

    Författare :Loke Lönnblad Ohlin; [2018]
    Nyckelord :astrophysics; astronomy; supernovae; shockwaves; interstellar medium; massive stars; turbulence; molecular clouds; Physics and Astronomy;

    Sammanfattning : The momentum and energy injection from supernovae is one of the main feedback modes, and is therefore key to the understanding of galaxy evolution and star formation. However, due to low resolution, large scale galaxy simulations often have issues with accurately modelling supernovae, and therefore rely on sub-grid models. LÄS MER

  3. 3. Tekniker för detektion av neutriner med ultrahög energi

    Kandidat-uppsats,

    Författare :Lawen Ahmedi; Mubarak Ali; Larisa Castellanos; [2017]
    Nyckelord :Teknik; tekniker; detektion; detektera; detektorer; detektor; observator; elementarpartikel; neutrino; neutriner; ultrahög; energi; fysik; astronomi; astrofysik; kosmisk strålning; radiostrålning; radiostrålar; partikel; partiklar;

    Sammanfattning : This project highlights various methods used to detect the elongated elemental particle neutrino. It is especially focused on the IceCube observatory, which uses Cherenkov light to detect these particles. LÄS MER

  4. 4. Mapping the present-day chemical abundance structure of the Solar neighbourhood: O & Si

    Master-uppsats, Lunds universitet/Institutionen för astronomi och teoretisk fysik; Lunds universitet/Astronomi

    Författare :Kristiina Verro; [2017]
    Nyckelord :astrophysics; stellar spectroscopy; abundance analysis; solar neighbourhood; massive stars; Galaxy; Physics and Astronomy;

    Sammanfattning : Context. Large scale chemical abundance gradients in the Galactic disks, small-scale abundance structures, and the mean chemical abundance values in the Solar vicinity, are important constraints to Galactic chemo-dynamical formation and evolution models. LÄS MER

  5. 5. High energy gamma ray emission and multi-wavelength view of the AGN PKS 0537-441

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)Linnéuniversitetet/Institutionen för datavetenskap (DV)

    Författare :Emma Fransson; [2017]
    Nyckelord :astrophysics; AGN; PKS 0537-441; jet; accretion; synchrotron self compton; spectral energy distribution;

    Sammanfattning : This thesis describes the analysis of Very High Energy (VHE) emission from the Active Galactic Nucleus PKS 0537-441. It also aims to put the results in a wider context by implementing previous work done on this source. The data chosen for the analysis is provided by the Fermi-LAT satellite and covers the energy range between 300 MeV and 300 GeV. LÄS MER

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