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(Series / Serietittel, 1950)
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(Master thesis / Hovedoppgave, 1999)
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(Master thesis / Hovedoppgave, 2002)It is believed that the Broad Emission Line Region of Quasars consists of discrete clouds. Due to the suspected small size of a cloud, the radiation from clouds may be strongly amplified by gravitational microlensing. It ...
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(Master thesis / Hovedoppgave, 2002)Five years (1992-1997, ~2650 images) of optical observations of the gravitational lens system QSO 0957+561 were analyzed using a new photometry package developed by Jan Teuber and me. My supervisor was Prof. Rolf Stabell, ...
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(Master thesis / Hovedoppgave, 2003)Through the two-point correlation function the effects of limited sky coverage and discretisation of data on satellite observations of the cosmic microwave background (CMB) is examined. Analytical expressions for the ...
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(Master thesis / Hovedoppgave, 2003)The thesis examines the relation between the magnetic field as measured by MDI and the continuum intensity at four different wavelengths (1319, 1199, 1037 and 910Å) as measured by SUMER. A method for copointing the instruments ...
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(Master thesis / Hovedoppgave, 2005)During inflation, the potential of the inflaton scalar field $\phi$, drives the exponential expansion of the Universe. The nature of the inflaton potential is presently unknown, but one hopes to learn more from observations ...
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(Master thesis / Masteroppgave, 2006)Two galaxy clusters, Abell 1351 and Abell 1995, are examined using weak gravitational lensing techniques. Mass maps are created, and the clusters' density and shear profiles are compared to theoretical predictions. Gravitational ...
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(Master thesis / Masteroppgave, 2007)
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(Master thesis / Masteroppgave, 2007)
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(Master thesis / Hovedoppgave, 2007)
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(Master thesis / Hovedoppgave, 2007)The goals of this thesis are to provide a general introduction to CMB fundamentals, give an overview of non-Gaussianity analysis, and to compare the sensitivities of a selection of tests (Minkowski functionals, skeleton ...
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(Master thesis / Masteroppgave, 2007)
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(Master thesis / Masteroppgave, 2007)Gravitational lensing has played an important role in cosmology since the discovery of the first gravitational lensing system in 1979 (Walsh et al.), where the quasar QSO 0957+561 can be seen in two images. Such multiple ...
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(Doctoral thesis / Doktoravhandling, 2007)Doktorgradsavhandlingen beskriver et programvarebibliotek utviklet av Øystein Olsen ved Institutt for teoretisk astrofysikk. Programvaren har blitt brukt til å finne regioner med stabile og ustabile baner rundt asteroider ...
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(Master thesis / Masteroppgave, 2008)In between the Cosmic Microwave Background (CMB) and the instrument there are other sources of radiation, called foregrounds. The foregrounds radiate in the same frequency bands as the background, and cause contamination ...
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(Master thesis / Masteroppgave, 2008)Observations of the Cosmic Microwave Background is impaired by other astrophysical sources that also radiate in the microwave spectrum. These other, non-CMB sources are known as foregrounds. In this thesis, three different ...
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(Master thesis / Masteroppgave, 2008)
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(Master thesis / Masteroppgave, 2008)Systematic anomalies that seem to follow the first ionisation potential (FIP) of the minor, heavy elements at the sun, have been found when comparing the observed elemental abundances in the upper solar atmosphere with the ...
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(Master thesis / Masteroppgave, 2008)In-situ observations together with spectroscopic measurements show that the elemental abundance in the solar atmosphere varies from the photosphere to solar wind. An enrichment for low First Ionisation Potential elements ...