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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Exterior Giant Planet Effects On Terrestrial Architecture, Anna Corinne Childs
Exterior Giant Planet Effects On Terrestrial Architecture, Anna Corinne Childs
UNLV Theses, Dissertations, Professional Papers, and Capstones
Terrestrial planet formation is a chaotic and violent process which is not fully understood. Prior to Kepler, Solar System observations were the basis for planet formation models. How- ever, Kepler observations have shown that exoplanet systems are very different from our solar system, thus requiring a more complete planet formation model. With advancements in com- putational ability, N-body integrators, and collision models, we can explore planet formation by experimenting with simulations in different parameter space. Our Solar System has shown us that exterior giant planets can play a vital role in the shaping of the final terrestrial planet system. Our …
Probing Broad Line Regions Of Active Galactic Nuclei, Champika Sandamali Weerasooriya
Probing Broad Line Regions Of Active Galactic Nuclei, Champika Sandamali Weerasooriya
UNLV Theses, Dissertations, Professional Papers, and Capstones
The broad line regions (BLR) of Type I Active galactic nuclei (AGN) are too small to be spatially resolved even with the most powerful telescopes available. Observations suggest that BLR gas is moving under the influence of the gravitational potential of the central supermassive black-hole (SMBH) and responds to the variations in the ionizing continuum flux of the accretion disk, giving rise to broad emission line variations with a time delay. Reverberation mapping campaigns seek to use this time variability to resolve the BLRs in the time domain instead of spatial domain, providing a way to infer geometry and kinematics …
Using Two Simulation Tools To Teach Concepts In Introductory Astronomy: A Design-Based Research Approach, Pamela A. Maher
Using Two Simulation Tools To Teach Concepts In Introductory Astronomy: A Design-Based Research Approach, Pamela A. Maher
UNLV Theses, Dissertations, Professional Papers, and Capstones
Technology in college classrooms has gone from being an enhancement to the learning experience to being something expected by both instructors and students. This design-based research investigation takes technology one step further, putting the tools used to teach directly in the hands of students. The study examined the affordances and constraints of two simulation tools for use in introductory astronomy courses. The variety of experiences participants had using two tools; a virtual reality headset and fulldome immersive planetarium simulation, to manipulate a lunar surface flyby were identified using a multi-method research approach with N = 67 participants. Participants were recruited …
Secular Resonances During Main-Sequence And Post-Main-Sequence Planetary System Dynamics, Jeremy L. Smallwood
Secular Resonances During Main-Sequence And Post-Main-Sequence Planetary System Dynamics, Jeremy L. Smallwood
UNLV Theses, Dissertations, Professional Papers, and Capstones
We investigate gravitational perturbations of an asteroid belt by secular resonances. We ap- ply analytic and numerical models to main–sequence and post–main–sequence planetary systems. First, we investigate how the asteroid impact rate on the Earth is affected by the architecture of the planetary system. We find that the nu6 resonance plays an important role in the asteroid collision rate with the Earth. Compared to exoplanetary systems, the solar system is somewhat special in its lack of a super–Earth mass planet in the inner solar system. We therefore consider the effects of the presence of a super–Earth in the terrestrial planet …
Understanding Progenitors Of Gamma Ray Bursts With Multi-Wavelength Properties, Ye Li
Understanding Progenitors Of Gamma Ray Bursts With Multi-Wavelength Properties, Ye Li
UNLV Theses, Dissertations, Professional Papers, and Capstones
Gamma-ray bursts (GRBs) are among the most brilliant explosions in the universe, named for their intense, seconds-duration $\gamma$-ray emission. They are generally classified into two categories according to the durations of their $\gamma$-ray emission: the long-duration GRBs (LGRBs) with durations more than 2 seconds, and the short-duration GRBs (SGRBs) with durations less than 2 seconds. Most SGRBs are believed to originate from mergers of compact stars (e.g., neutron star-neutron star and neutron star-black hole; also known as Type I GRBs by their physical mechanism), while the LGRBs are thought to originate from core-collapse of massive stars (Type II). In addition …
The Formation And Dynamics Of Clouds In The Environment Of Active Galactic Nuclei, Timothy Waters
The Formation And Dynamics Of Clouds In The Environment Of Active Galactic Nuclei, Timothy Waters
UNLV Theses, Dissertations, Professional Papers, and Capstones
Active galactic nuclei (AGN) are among the most luminous objects in the universe and are known to be powered by accretion onto supermassive black holes in the centers of galaxies. AGN clouds are prominent components of successful models that attempt to unify the diversity of AGN. These clouds are often hypothesized to be the source of the broad and narrow line emission features seen in AGN spectra. Moreover, the high column densities of gas needed to account for broad absorption lines has been attributed to the same population of clouds, while the motion of AGN clouds has been invoked to …