Sökning: "Fermi gamma-ray space telescope"

Hittade 5 avhandlingar innehållade orden Fermi gamma-ray space telescope.

  1. 1. Photospheric emission in gamma ray bursts Analysis and interpretation of observations made by the Fermi gamma ray space telescope

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

    Författare :Shabnam Iyyani; Stockholms universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; gamma ray bursts; photosphere; radiation mechanism; Theoretical Physics; teoretisk fysik;

    Sammanfattning : The large flashes of radiation that are observed in GRBs are generally believed to arise in a relativistic jetted outflow. This thesis addresses the question of how and where in the jet this radiation is produced. LÄS MER

  2. 2. Cosmological Dark Matter and the Isotropic Gamma-Ray Background Measurements and Upper Limits

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

    Författare :Alexander Sellerholm; Stockholms universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dark matter theory; dark matter simulations; dark matter experiments; isotropic gamma-ray background; Fermi gamma-ray space telescope; NATURAL SCIENCES Physics Astronomy and astrophysics Astroparticle physics; NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik; Theoretical Physics; teoretisk fysik;

    Sammanfattning : This thesis addresses the isotropic diffuse gamma-ray background, as measured by the Fermi gamma ray space telescope, and its implications for indirect detection of dark matter. We describe the measurement of the isotropic background, including also an alternative analysis method besides the one published by the Fermi-LAT collaboration. LÄS MER

  3. 3. Subphotospheric dissipation in gamma-ray bursts observed by the Fermi Gamma-ray Space Telescope

    Detta är en avhandling från Stockholm : Kungliga Tekniska högskolan

    Författare :Björn Ahlgren; KTH.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning : Gamma-ray bursts (GRBs) are the brightest events in the Universe, for a short time outshining the rest of the Universe combined, as they explode with isotropic equivalent luminosities up to $10^{54}$ erg s$^{-1}$. These events are believed to be connected to supernovae and to binary compact object mergers, such as binary neutron stars or neutron star -- black hole systems. LÄS MER

  4. 4. Search for Gamma-ray Lines from Dark Matter with the Fermi Large Area Telescope

    Detta är en avhandling från Stockholm : KTH

    Författare :Tomi Ylinen; KTH.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Fermi; Large Area Telescope; gamma-rays; dark matter; spectral lines; beam test; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; NATURAL SCIENCES Physics Astronomy and astrophysics Astroparticle physics; NATURVETENSKAP Fysik Astronomi och astrofysik Astropartikelfysik;

    Sammanfattning : Dark matter (DM) constitutes one of the most intriguing but so far unresolved issues in physics. In many extensions of the Standard Model of particle physics, the existence of a stable Weakly Interacting Massive Particle (WIMP) is predicted. The WIMP is an excellent DM particle candidate. LÄS MER

  5. 5. Photospheric emission in gamma-ray bursts

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Christoffer Lundman; KTH.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis considers emission from gamma-ray bursts (GRBs), the most powerful explosions known in the Universe. Most GRBs are likely associated with the final stages of stellar evolution, where the core of a massive star collapses, and gives birth to a highly compact object such as a neutron star or black hole. LÄS MER