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 20 of 96 for “"Extragalactic"”.
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Extragalactic Globular Cluster Systems
Das Ziel dieser Dissertation ist die spektroskopische Studie von extragalaktischen Kugelsternhaufensystemen. Ihre Motivation ist das bessere Verstaendnis der Bildung und Entwicklung dieser Kugelsternhaufensysteme und ihrer Wirtsgalaxien. Zu diesem Zweck werden spektroskopische Linienindices des …
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Extragalactic Novae and Their Progenitors
… curves far deeper than is typically possible for extragalactic systems.A statistical study was then carried out to test the results of the survey and derive an estimate of the proportion of M31 novae associated with a resolved source in the HST data. This includes, for example, models of the …
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Asymmetries in extragalactic radio sources
… the three dimensional hydrodynamics of extragalactic radio jets. This entailed putting together a large number of numerical tools before such simulations could be performed. The thesis was structured to be a set of papers, each addressing a computational or astrophysical issue that was …
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Starbursts in extragalactic giant H II regions
Extragalactic giant H II regions (EGHRs) are sites of active, concentrated star formation on manageable scales, and thus provide ideal labs to analyze starburst phenomena. To get a complete picture of the starburst phenomenon, the critical characteristics we must investigate include star formation …
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Extragalactic Radio Sources in Uniform Model Universes
Made available in DSpace on 2014-12-09T18:34:01Z (GMT). No. of bitstreams: 1 7013456.pdf: 2165188 bytes, checksum: 103532548393fa302ab35585d35fc7e3 (MD5) Previous issue date: 1969
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The Luminosity Function of Extragalactic Radio Sources
Made available in DSpace on 2014-12-05T20:51:49Z (GMT). No. of bitstreams: 1 6305138.pdf: 4472075 bytes, checksum: 7d669eae6b8c4bd5d7775f4188d48ae0 (MD5) Previous issue date: 1963
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Giant Pair Halos Surrounding Non-Thermal Extragalactic Objects
Hochenergetische (E>100 GeV) Gammastrahlen aus extragalaktischen Quellen werden infolge der gamma-gamma-Paarbildung (PP) von der kosmischen Infrarot-Hintergrund-strahlung (CIB) absorbiert und loesen elektromagnetische Schauer durch Paarbildung und inverse Comptonstreuung aus. Dies fuehrt zur …
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Structural and Photometric Properties of Extragalactic Stellar Spheroids
After an overview of the science of galaxy morphology, a new classification for galactic form, based upon the Yerkes system, is presented. This classification scheme is then applied to the study of the role of environment in determining the nature of galaxy populations. By examining the …
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The Universality of Intrinsic Flattening in Extragalactic Stellar Disks
Highly inclined (edge-on) galaxies provide the unique perspective necessary to constrain 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 …
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Improving the extragalactic distance scale using Cepheids in M33
… as Cepheids are used to tie down the base of the extragalactic distance scale. Without an accurate calibration for the nearest distances, the distances we measure for all other objects will be subject to systematic uncertainties. This thesis studies how the chemical composition of a Cepheid …
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The formation and evolution of massive clusters in extragalactic environments
There are a host of open questions in the study of massive clusters relating to cluster formation and evolution. Understanding these processes can be useful in studying their host galaxies and how they have evolved. The formation of globular clusters is also a well debated topic, which is yet …
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Detecting and understanding extragalactic Lyman α emission using 3D spectroscopy
In this thesis we use integral-field spectroscopy to detect and understand of Lyman α (Lyα) emission from high-redshift galaxies. Intrinsically the Lyα emission at λ = 1216 Å is the strongest recombination line from galaxies. It arises from the 2p → 1s transition in hydrogen. In star-forming …
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Spectral characteristics of low-frequency variability in compact extragalactic radio sources
… of the observed fluctuations. Plane waves from extragalactic radio sources propagating through the interstellar medium, a medium with fluctuations of the refractive index due to electron density irregularities, emerge from that medium corrugated. Since fluctuations present on scales greater than …
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Multi-Wavelength Extragalactic Surveys: Star Formation of IR-Submm Selected Galaxies
This Thesis aims to identify and analyse galaxy populations over a range of redshifts in order to evaluate the star formation history over cosmic time. Explicitly focusing on the infrared to submillimetre regime, I carried out a comprehensive multi-wavelength approach at the North and South …
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Wideband spectropolarimetry of extragalactic radio sources with KAT 7 and commissioning phase MeerKAT
The study of cosmic magnetism is vital in fully understanding the role that magnetic fields play in the evolution of cosmological objects such as galaxies. The exact role played by magnetism in galaxy evolution is still not fully understood. This work aims to use wide band radio polarimetry to …
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The nature and evolution of I. extragalactic radio sources, and II. young stellar clusters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Test of the Infrared Wide-Field Camera OMEGA2000 and its Application for an Extragalactic Survey
OMEGA2000 is a prime-focus, near-infrared, wide-field camera, mounted on the 3. 5m telescope at Calar Alto. The camera uses a 2kx2k HAWAII-2 Focal plane array with a sensitivity from z to K band. In the first part of the thesis, we discuss the work aimed at optimizing the operation of the HAWAII-2 …
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