Search for dissertations about: "garrelt mellema"

Showing result 1 - 5 of 10 swedish dissertations containing the words garrelt mellema.

  2. 1. Prior-less derivation of the astrophysical factor of Dwarf Spheroidal galaxies

    Author : andrea chiappo; jan dr. conrad; garrelt mellema; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; dwarf galaxies; dark matter; fysik; Physics;

    Abstract : Dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are considered ideal targets for particle Dark Matter (DM) identification. Indirect detection strategies entail examining dSphs in search for signals of annihilating or decaying DM, in the form of excess electrons or gamma- and X-ray photons above the astrophysical background. READ MORE

  4. 2. Exploring the nature of ISM turbulencein disc galaxies

    Author : Timmy Ejdetjärn; Göran Östlin; Oscar Agertz; Garrelt Mellema; Troels Haugbølle; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; galaxies; galaxy; disc galaxy; star formation; ISM; interstellar medium; kinematics; dynamics; evolution; turbulence; numerical; Astronomy; astronomi; teoretisk astrofysik; Theoretical Astrophysics;

    Abstract : Galaxy formation is a continuous process that started only a few hundred million yearsafter the Big Bang. The first galaxies were very volatile, with bursts of star formationand disorganised gas motions. READ MORE

  5. 3. Simulations of Cosmic Reionization : Shapes & Sizes of H II regions around Galaxies and Quasars

    Author : Martina M. Friedrich; Garrelt Mellema; Jonathan Pritchard; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astronomy; astronomi;

    Abstract : After the era of recombination, roughly 360 000 years after the big bang (redshift 1100), the universe was neutral, continued to expand and eventually the first gravitationally collapsed structures capable of forming stars, formed. Observations show that approximately 1 billion years later (redshift 6), the Universe had become highly ionized. READ MORE

  6. 4. Understanding the large-scale structure of the the21-cm signal originating from the Epoch of Reionisation

    Author : Ivelin Georgiev; Garrelt Mellema; Jens Jasche; Aurel Schneider; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reionisation; cosmology; 21-cm; large-scale structure; Astronomy; astronomi;

    Abstract : The first billion years from the beginning of the Universe is the focus of multiple astronomical facilities in the upcoming decade. This unique era is marked by the formation of the first stars and galaxies, which release ionising radiation into the intergalactic medium(IGM). READ MORE

  7. 5. Tomographic studies of the 21-cm signal during reionization : Going beyond the power spectrum

    Author : Sambit K. Giri; Garrelt Mellema; Benoît Semelin; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reionization; non-gaussianity; first stars; image processing; Astronomy; astronomi;

    Abstract : The formation of the first luminous sources in the Universe, such as the first generation of stars and accreting black holes, led to the ionization of hydrogen gas present in the intergalactic medium (IGM). This period in which the Universe transitioned from a cold and neutral state to a predominantly hot and ionized state is known as the Epoch of Reionization (EoR). READ MORE