Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Spitzer Space Telescope"”.
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A Spitzer Mid-Infrared Study of Active Galactic Nuclei with Outflows
… both BAL and non-BAL quasars obtained with the Spitzer Space Telescope. We find the BALQSOs have an average equivalent width 40% larger and an average MIR-optical luminosity ratio 40% smaller than the ControlQSOs. We explore the physical meaning behind these results.
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Characterizing Exoplanet Atmospheres: From Light-curve Observations to Radiative-Transfer Modeling
… of transiting exoplanet data. I analyzed space-telescope data for three planets to characterize their atmospheres and refine their orbits, investigated correlated noise estimators, and contributed to the development of the respective data-analysis pipelines. Chapters 2 and 3 describe the …
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Infrared-Bright Active Galactic Nuclei in Massive Galaxy Clusters
… galaxy cluster sample from the South Pole Telescope spanning a redshift range of 0.15 ≲ z ≲ 1.7 for which we have acquired follow-up Spitzer Space Telescope observations. With these data we explore the incidence of IR-bright AGN in clusters as a function of cluster mass, redshift, and …
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Lenticular galaxies - the one in the middle
… A sample of lenticular galaxies from the Spitzer Survey of Stellar Structure in Galaxies (S4G) using the Spitzer Space Telescope along with Sloan Digital Sky Survey (SDSS) was used for this project to study molecular gas properties as well morphologies associated with dust where molecular …
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From Spitzer mid-infrared observations and measurements of peculiar velocities to constrained simulations of the local universe
… observable from a given position, in time and space, is available for comparisons with simulations. The related cosmic variance affects our ability to interpret the results. Simulations constrained by observational data are a perfect remedy to this problem. Achieving such simulations requires …
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Models of Dust and Gas Tori in Active Galactic Nuclei
… spectral energy distributions (observed with the Spitzer space telescope). Problems of the comparison of continuous models with the silicate feature strength to H I column density relation can be overcome with the help of our new approach.
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Analysis of exoplanetary transit light curves
… as measured by an instrument on the Hubble Space Telescope, in an effort to properly constrain the stellar and exoplanetary radius. In addition, we assess a detection of strong, wavelength dependent absorption, possibly due to an unusual atmospheric composition. For HD 189733b, we utilize …
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A 3-dimensional analysis of the Cassiopeia a supernova remnant.
… to accomplish these science goals, we used the Spitzer Space Telescope’s Infrared Spectrograph to create a high resolution spectral map of select regions of Cas A, allowing us to make a Doppler reconstruction of its 3-dimensional structure structure. In the center of the remnant, we find …
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The influence of planetary and stellar companions on debris discs
Around 20% of main-sequence stars are known to host debris discs composed of planetesimals and the dust produced in their collisions. The structures of these discs can be constrained through spectral energy distribution (SED) modelling or direct imaging of the dust. Gravitational perturbations in a …