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 158 for “"outflows"”.
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Outflows and Dust in Quasars
… arise from major galaxy mergers, quasar-driven outflows must therefore persist after the obscuring dust is cleared from the line of sight.
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Propagation of molecular outflows into inhomogeneous media
… are thought to be responsible for the molecular outflows that are observed in molecular clouds. Interactions between these molecular outflows and the inhomogeneous molecular clouds they encounter may cause changes in the observable characteristics of the outflows by affecting their velocity …
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AGN outflows and the cluster cooling flow conundrum
… units to support the simulation of a pair of outflows in the intracluster medium whilst using classical fluid dynamics. The three simulation chapters involve a single parameter being varied and its impact on jet morphology and the heating process studied. The jet opening angle was found not to …
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Multiphase Galactic Outflows: Physical Properties and Feedback Effects
… galaxies. One feedback route is through galactic outflows, which eject large amounts of gas and thereby remove the fuel for future star formation. Such galactic outflows can be driven by active galactic nuclei (AGN) or processes associated with star formation such as supernovae or radiation …
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On the Distances and Energetics of AGN Outflows
Active galactic nuclei (AGN) ubiquitously show outflows. It is now widely recognized that these outflows are key components in the evolution of super-massive black holes and their host galaxies. As important as these outflows are, we still lack sufficient understanding of their structure and …
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Observational Studies of Rare Quasar Outflows: the FeLoBALs
The absorption spectra of quasar outflows are studied in order to determine their kinematic and energetic properties and how they affect their host galaxy and its surroundings. If an outflow is sufficiently powerful to have an effect, a process known as active galactic nucleus (AGN) feedback, it …
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Numerical simulations of mass outflows from star-forming regions
The development, testing, and application of a two dimensional radiation magnetohydrodynamics (RMHD) code is described in detail. Well developed Eulerian hydrodynamic algorithms are used, but are implemented in a new covariant formalism which facilitates simulations in any orthogonal coordinate …
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A Study of Quasar Outflows: Physical Characteristics and Feedback Effects
… the physical parameters of the absorption outflows of five different quasars: including electron number density, Hydrogen column density, ionization parameter, distance from the source, and kinetic luminosity. We have found that an outflow's chemical abundance can be a determining factor of …
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A Spitzer Mid-Infrared Study of Active Galactic Nuclei with Outflows
We present results of a study of the mid-infrared emission of broad absorption line (BAL) quasars to determine how they are related to the general population of quasars. We use the CLUMPY program code to create models of the tori that surround Active Galactic Nuclei. We compare these models to …
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Quasar Outflows: Their Scale, Behavior and Influence in the Host Galaxy
Quasar outflows are a major candidate for Active Galactic Nuclei (AGN) feedback, and their capacity to influence the evolution of their host galaxy depends on the mass-flow rate (M) and kinetic luminosity (E) of the outflowing material. Both quantities require measurement of the distance (R) to the …
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Identifying Dry Intrusion Outflows in Present and Future Climates with Machine Learning
… change science, and allows the future of DI outflows to be studied. Through a proof-of-concept and comparison of applied methods, followed by advanced model development, a convolutional neural network -- DI-Net -- is trained to identify DI outflow objects across the Northern Hemisphere, using …
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Kinetic Modeling of Ionospheric Outflows Observed by the VISIONS-1 Sounding Rocket
… plasma sheet and ring current regions. Outflows alter mass density and reconnection rates, hence global responses of the magnetosphere. The VISIONS-1 (VISualizing Ion Outflow via Neutral atom imaging during a Substorm) sounding rocket was launched on Feb. 7, 2013 at 8:21 UTC from Poker …
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A Semi-Analytical Line Transfer (SALT) Model For Bi-conical Galactic Outflows
… and Panagia (2015) for modeling galactic outflows, to account for bi-conical geometries of various opening angles and orientations with respect to the line-of- sight to the observer, as well as generalized velocity fields. We model the absorption and emission component of the line profile …
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Circumstellar Structure Properties of Young Stellar Objects: Envelopes, Bipolar Outflows, and Disks
… young stellar objects (YSOs), envelopes, bipolar outflows, and circumstellar disks, have been studied using radio interferometers: the Berkeley-Illinois-Maryland Association (BIMA) array and the Combined Array for Research in Millimeter-wave Astronomy (CARMA). (1) Envelopes: Three Class 0 YSOs …
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Investigating the role of ionised outflows in galactic evolution through spatially resolved spectroscopy
… A majority of this feedback is likely due outflows, ejecting large reservoirs of star forming gas from the galaxy and quenching star formation, powered by either AGN or SNe. However, recent theoretical and numerical models suggest that feedback due to outflows may also be able to promote …
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A near-infrared view of luminous quasars: black hole masses, outflows and hot dust
… confirmed quasars. Quasars driving powerful outflows over galactic scales is a central tenet of galaxy evolution models involving 'quasar feedback' and significant resources have been devoted to searching for observational evidence of this phenomenon. We have used [OIII] emission to probe …
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The Liberalization of Capital Outflows and Its Positive influence on capital inflows : modelsand empirical analysis
The liberalization of capital outflows could cause an increase, rather than decrease, in capital inflows. The aim of this thesis is to explore the paradox. Empirical evidence from four countries, Spain, New Zealand, Italy and Uruguay, is introduced to illustrate the positive influence of …
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Empirical Constraints on O(5+) Outflows and Velocity Distributions in a Solar-Minimum Coronal Streamer
As part of an effort to understand how the solar wind is energized, the so-determined electron density is used to interpret O VI lambda1032, 1037 A spectra taken with UVCS. The spectra are interpreted in terms of empirical constraints on the O5+ ion velocity distributions and outflow speeds. Four …
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Ion-Cyclotron Resonance Heating of O+ in the Topside Ionosphere and Mapping Outflows to the Magnetosphere
… the upward acceleration of ions in type-II ion outflows and ion conics. Instead of employing the guiding center approximation, as is usually done with single particle tracing models in order to make the outflow simulation less computationally expensive, the trajectories here resolve the ions’ …
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