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 14 of 14 for “"Stellar Disk"”.
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Dark Matter in Spiral Galaxies
… gravitational potentials, combined from stellar disk and dark halo contributions. The gravitational potential of the stellar disk was derived from color-corrected NIR photometry and for the dark halo, the mass density distribution of an axisymmetric isothermal sphere with a core was …
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A multi-wavelength study of the dwarf galaxies NGC 2915 and NGC 1705 : star formation, gas dynamics and dark matter
… Compact Array, October 2006 - May 2007. The stellar disk of NGC 1705 is host to an intense star-bursting core which is rapidly depleting the galaxy's central Hi reservoir. This galaxy can be used to rigorously test theories of star formation. Detailed studies of the distribution and …
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Stellar Dynamics in the Outer Galactic Disk under the Influence of a Central Bar
… the possible influence of a central bar in a disk galaxy on the velocity distribution in the outer stellar disk, which is thought to arise mostly via resonant phenomena. For this, we numerically integrate orbits of a large number of sample points in a 2D model potential consisting of a …
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Uncovering the Structure of the Galactic Bulge Using Kinematic Data from the JASMINE Near-Infrared Astrometric Satellite
… Center (GC) is the region with the most extreme stellar densities, a strong gravitational field, and the most prolific star formation region in the Milky Way. Furthermore, the Milky Way is the only galaxy that we can resolve individual structure such as Nuclear Stellar Disk (NSD) and Nuclear …
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Struktur und Dynamik wechselwirkender Galaxien
… simulations of collisionless mergers between disk galaxies with different mass ratios and orbital geometries were performed. Every merger remnant was investigated with respect to its photometric and kinematic properties. The methods used to determine the characteristic properties were …
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Shocks and Metallicity Gradients in Normal Star-Forming Galaxies
… I measure metallicity gradients in isolated disk galaxies and show that their metallicity gradients are remarkably simple and universal. When the metallicity gradients are normalized to galaxy sizes, all the 49 galaxies studied have virtually the same metallicity gradient. I model the common …
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Analysis of exoplanetary transit light curves
… period as the exoplanet covers a portion of the stellar disk. This exoplanetary transit light curve provides a wealth of information about both the planet and star. In this Thesis we consider the transit light curve as a tool for characterizing the exoplanet. The Thesis can divided into two …
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Spectropolarimetry of epsilon Aurigae: Probing Stellar and Disk Atmospheres
… to uncover physical mechanisms contributing to disk formation and evolution and to explore the relationship between photospheric anisotropies, stellar pulsation and mass loss. This research contributes to our understanding of stellar evolution in the context of binary stars. The research also …
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Gas distribution, star formation and giant molecular cloud evolution in nearby spiral galaxies
… size scales, starting from the whole galactic disk to the size of the Giant Molecular Clouds (GMCs). Differences in the shape and width of global CO and HI spectra of resolved disks of spiral galaxies are systematically investigated using a nearby sample for which high-resolution CO and HI maps …
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Star formation and disk stability in nearby galaxies
… of apparent cutoffs in star formation in the disks of galaxies as well as apparent thresholds in empirical laws of star formation have led many workers in the field to seek out the drivers and regulators of star formation in galaxies. Although the intricate details of these drivers are yet to …
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Weighing the Milky Way While Exploring Dynamical Disequilibrium
… Neighborhood gravitational potential and the stellar distribution in phase spaces. Such simultaneous fittings not only measured the gravitational potential and decomposed them into baryonic and dark contributions, they also made it convenient for residual analysis in arbitrary spaces. Taking …
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Insights from spectral stacking on the Hi content of cluster galaxies in various environments: a tale of two clusters
… field which has a higher fraction of younger, disk-dominated galaxies. Which environmental processes are the cause of this morphology-density relation is still unknown. The dominant processes at play in the cluster environment tend to strongly impact the neutral hydrogen (H i) gas disks of …
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A study of the absorption characteristics of gaseous galaxy halos in the local Universe
… halo, a sphere of gas that surrounds the stellar disk of a galaxy, is especially interesting. It provides a wealth of information about in and outflowing gaseous material towards and away from galaxies and their hierarchical evolution. For the Milky Way, the so-called high-velocity clouds …
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The Universality of Intrinsic Flattening in Extragalactic Stellar Disks
… the intrinsic flattening, 𝑐/𝑎, of galactic disks. We use “dust-free” 3.6 𝜇m maps of 141 edge-on spiral galaxies from the Spitzer Survey of Stellar Structure in Galaxies (S4G) and its early-type galaxy extension to determine the intrinsic flattening of stellar disks. The proper assessment of …