Sökning: "dark ages"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden dark ages.

  1. 1. Tomographic study of the 21-cm signal

    Författare :Sambit Kumar Giri; Garrelt Mellema; Matthew Hayes; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dark ages; reionization; first stars – early universe – methods: statistical – radio lines: galaxies – techniques: interferometric – techniques: image processing; Astronomy; astronomi;

    Sammanfattning : The next generation radio telescopes such as the Square Kilometre Array (SKA) will be able to produce images of the redshifted Hi (neutral hydrogen) 21-cm signal from the Epoch of reionization (EoR). In this thesis, we use the simulated tomographic images of the signal and investigate methods to extract and interpret information from those images. LÄS MER

  3. 2. Gravitational lensing as a probe of the first stars and galaxies

    Författare :Claes-Erik Rydberg; Erik Zackrisson; Lise Christensen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stars: Population III; first stars; Galaxies: high-redshift; Galaxies: Population III; dark ages; reionization; techniques: photometric; Astronomy; astronomi;

    Sammanfattning : This thesis investigates the potential for detection and identification of primordial stars, galaxies, and supernovae at high redshift.Simulations indicate that the first Population III stars should appear in minihalos of mass M = 105-106 Msol at z ≈ 10-30. LÄS MER

  4. 3. Bothnia dystrophy, a clinical, genetical and electrophysiological study

    Författare :Marie Burstedt; Ola Sandgren; Ola Textorius; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Ophtalmology; retinal pigment epithelium; retinitis pigmentosa; neural retina; electroretinogram; cellular retinaldehyde-binding protein; dark adaptometry; retinal degeneration; Oftalmiatrik; Ophtalmology; Oftalmologi; Ophtalmology; oftalmiatrik;

    Sammanfattning : A high frequency of retinitis pigmentosa (RP) is found in Northern Sweden. In an inventory of autosomal recessive RP patients in Västerbotten County, a great number of cases with a unique phenotype was noticed, denoted Bothnia Dystrophy (BD). LÄS MER

  5. 4. Molecular Astrophysics in Star-forming Regions with the Odin Satellite

    Författare :Carina Persson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The interstellar medium is the cradle of life, stars and planets in the evolving Universe. Stars are born deep inside cold and dark molecular clouds, and affect the dynamical conditions in local regions by powerful winds, outflows, and by supernova explosions. LÄS MER

  7. 5. On the emergent structures at cosmic dawn

    Författare :Anton Vikaeus; Erik Zackrisson; Martin Sahlén; Andrea Pallottini; Uppsala universitet; []
    Nyckelord :Extragalactic astronomy and cosmology; structure formation; the first generation of stars and galaxies; gravitational lensing.; Astronomi med inriktning mot astrofysik; Astronomy with specialization in Astrophysics;

    Sammanfattning : Recent developments have granted us the means necessary for studying the emergence of the very first luminous structures in the Universe. The beckoning of the first generation of stars marks the end of the cosmic dark ages – thus entering into the cosmic dawn. LÄS MER