Search for dissertations about: "High-redshift"

Showing result 16 - 20 of 31 swedish dissertations containing the word High-redshift.

  2. 16. The spatial distribution of Lyman alpha from star-forming galaxies in the low redshift Universe

    Author : Armin Rasekh; Göran Östlin; Roland Bacon; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lyman alpha; star-forming galaxies; Galaxy evolution; Epoch of Reionisation; galaxy morphology; Lyman continuum diagnostics; gas kinematics of galaxies; Astronomy; astronomi;

    Abstract : The Lyman alpha (Lyα) emission line from the recombination of hydrogen atoms is predicted to be the strongest spectral feature of galaxies. This emission line is regularly used to detect and characterise high redshift galaxies. However, studying this spectral line is challenging. READ MORE

  4. 17. Tests for systematic effects in supernova cosmology

    Author : Serena Nobili; Ariel Goobar; Bruno Leibundgut; Stockholms universitet; []
    Keywords : Cosmology; supernovae; astrophysics;

    Abstract : Type~Ia supernovae are used as standard candles to measure the energy density components of the universe. This led to the new paradigm in cosmology: only about 30\% of the universe is made by ordinary pressure-less matter, the rest is associated with an unknown form of energy with a negative equation of state parameter, called dark energy, able to drive the accelaration of the universe. READ MORE

  5. 18. Measurements of High-Precision Atomic Data with Applications to Astrophysics and Cosmology

    Author : Maria Aldenius; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; atomic data; Ca; Cr; Fe; Mn; Mg; metal-poor stars; fine-structure constant; Fourier transform spectroscopy; nebulae; oscillator strengths; spectroscopy; wavelengths; Ti; Zn; Astronomy; Astronomi; Atomic and molecular physics; Atom- och molekylärfysik; rymdvetenskap; space research; cosmic chemistry; kosmisk kemi; branching fractions;

    Abstract : Investigations of astrophysical spectra require accurate atomic data, such as wavelengths and transition probabilities. This thesis provides high-precision atomic data for astrophysical and cosmological applications. The measurements have been carried out using Fourier transform spectrometry on light produced in a hollow cathode light source. READ MORE

  6. 19. Using Lyα to illuminate the circumgalactic medium and the Epoch of Reionization : Lessons from low redshift

    Author : Axel Runnholm; Matthew J. Hayes; Ross McLure; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lyman alpha galaxies; Starburst galaxies; Galaxy evolution; Epoch of Reionization; Circumgalactic medium; Astronomy; astronomi;

    Abstract : The field of extragalactic astronomy is progressing rapidly but there is still much to understand and many questions that remain open. During recent years the Lyα emission line has come to the fore as a potentially very powerful astrophysical tool and is now routinely used to find galaxies at the very highest redshifts. READ MORE

  7. 20. Aspects of quarks in exotic matter

    Author : Daniel Enström; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

    Abstract : In this licentiate thesis, two different aspects of particle physics have been studied. The results are presented in four papers. In papers I and II, a model for a joint origin of gamma-ray bursts and dark matter is presented. The common denominator is the deconfined state of quarks, the Quark-Gluon Plasma (QGP). READ MORE