18 Works

Talking In: Maori English as Index for Maori identity in Film

Allura Warden
New Zealand cinema often represented Maori people as an exotic background to a paradisaical country while Pakeha were represented as heroic protagonists helping bring progress to a backwards nation. Until recently the national film industry was almost entirely Pakeha run. Consequently, there was a dearth of Maori presence in all industry positions. However, since the Maori cultural revolution there has been progress in Maori cinematic presence which has spurred the creation of Maori-produced media. Their...

Thermal Analysis of High Altitude Ballooning Payloads

Paul Hughes
Balloon-borne telescopes have the potential to produce almost space telescope quality data, because stratospheric balloons float above 99% of the atmosphere. The stratospheric environment poses unique and unsolved issues especially in the thermal stability of the optics. To inform the design of the future ”Testbed for High-Acuity Imaging - Stable Photometry and Image-Motion Compensation Experiment” balloon borne telescope, a team formed to improve thermal models for the stratosphere, especially by including convection. To accomplish such...

Examination of Planetary Systems with Kepler Data

Claire Teclaw
In this period of study we attempted to use data from the Kepler archive to deduce information about planetary systems observed by that mission. The ultimate goal was to potentially identify features of the planets in these systems by examining ellipsoidal variations in their light curves. For this purpose we attempted to, separately, apply PyKE utilities and create new code to search the mission’s fits files. We discovered potential issues with the PyKE code regarding...

The Distance to the Sagittarius Dwarf Galaxy and its Relation to M54 using Infrared Photometry of RR Lyrae Variable Stars

Arvind Gupta
The Sagittarius dwarf galaxy (Sgr) is among the most massive satellites of the Milky Way and is unique due to its extensive tails of tidally stripped stars. Models of these tails provide strong constraints on the orbital history of Sgr, which in turn lend insight into the structure of the Milky Way’s dark matter halo. Fully understanding the dynamics of Sgr, however, relies on a precise distance to the core. Yet past measurements yield a...

Analysis of C2H4O2 Isomers in NGC 6334 I

Samer El-Abd
We have analyzed the abundances of the three isomers methyl formate (CH3OCHO), glycolaldehyde (cis-CH2OHCHO), and acetic acid (CH3COOH) in the NGC 6334 I-MM1 and -MM2 massive star-forming regions using Atacama Large Millimeter/submillimeter Array (ALMA) data. In the MM1 star-forming region, we derived column densities of 9.93 (0.94) e17 cm-2 for methyl formate, 1.24 (0.16) e17 cm-2 for acetic acid, and 9.31 (0.68) e15 cm-2 for glycolaldehyde. In the MM2 star-forming region we derived column densities...

Uncertainties and Cosmological Constraints from the Megamaser Cosmology Project

Martine Lokken
This paper investigates sources of uncertainty within the Megamaser Cosmology Project (MCP) as well as cosmological implications of the results as of 2018. The contribution of uncertainty in the value of the matter energy density parameter, Omega_m, towards total uncertainty on the MCP H_0 calculation is found to be negligible (<2%) for galaxies at the redshifts currently used by the project. However, if future projects use angular-diameter distances at further redshifts to calculate H_0, the...

A Monte-Carlo Implementation of a Geodesic Integrator for Relativistic Radiative Transfer in Accreting Black Hole Systems

Eli Golub
We describe the implementation of a relativistic geodesic integrator into a Monte-Carlo radia- tive transfer code intended for computing the spectra produced from thermal emission in optically thick accretion disks around a black hole. We first implemented the integrator and tested it by computing geodesics in the Schwarzschild metric and demonstrated agreement with geodesics computed by the relativistic radiative transfer code geokerr (Dexter & Agol 2009). We then im- plemented the integrator as a module...

SED Fitting of WISE-Selected Luminous, Obscured Quasars at Redshift ~ 2

Patrick Edwards
This project was designed to characterize the nature of a sample of high-redshift galaxies selected from the Wide-field Infrared Survey Explorer catalog (WISE), believed to be hosts to active galactic nuclei (AGN). We believe that these objects are highly dust obscured AGN in the center of their host galaxies, at a very interesting and not well understood point in galaxy evolution. After determining the magnitudes of each object in eight different wavelength bands - ranging...

Investigating the Edge of High Mass Star Formation in the Milky Way Galaxy

Nicholas Ferraro
The Outer Scutum-Centaurus arm (OSC) is the most distant molecular spiral arm known in the Milky Way. The OSC was first revealed in 2011 by Dame and Thaddeus using HI and CO data as a possible extension of the Scutum-Centaurus arm. Here we use the Arizona Radio Observatory (ARO) 12m telescope to observe the 12CO (J = 1-0) and 13CO (J = 1-0) transitions towards 78 HII region and HII region candidates in the First...

Description and Cost Benefit Analysis of Proposed Enhancements to ALMA

John Josephs
The Atacama Large Millimeter Array, or ALMA, is a conglomerate of 66 giant antennae located in the Atacama Desert of northern Chili. Through advanced computing, these antennae work together as a single telescope to pick up radio signals from stars, planets, or other galaxies. Since beginning operations in 2011, ALMA has played a major role in scientific discoveries propelling the field of astronomy. With ALMA’s extreme sensitivity and resolution, astronomers have been able to create...

A Full Polarization Analysis of NGC 3665

Evan Sheldahl
In this thesis, I analyzed Very Large Array (VLA) L-band observations of the Stokes cube coming from the active galactic nucleus (AGN) of the lenticular galaxy NGC 3665. Its data come from the ATLAS 3D Survey, a highly spatially resolved dataset of 260 early type galaxies (ETGs). I present intensity maps of its non-polarized and linearly polarized emission as well as optical R-band and interferometric CO(1-0) molecular gas data. The way in which the molecular...

Gravitational Wave Emission from Tight White Dwarf Binary Systems Formed Through Common Envelope Evolution

Juan Carlos Velasco Barboza
With the upcoming launch of the Laser Interferometer Space Antenna (LISA), the next natural candidates for merger observations are White Dwarf binaries. Current stellar mass candidates for gravitational wave sources suggest the existence of a mechanism which turns high period systems into low period ones. That is, if we hope to see mergers of such low-mass objects within the age of the Universe. In this paper we follow Iben.Jr,Tutukov.(1986)[1] to explore the different possible channels...

NASA Public Opinion and the Federal Budget

Layla Bryant
This paper will explore the implications of growing economy in GDP per capita and public opinion about NASA on the budget granted to the agency each year. These trends are interesting and relevant to the Astronomy and Astrophysics community through the funding aspect and the public association of NASA with Astronomy and space. Using data from the General Social Survey, U.S. Gross Domestic Product, Office of Management and Budget, this paper explores relationships between public...

Callisto's Dynamic Atmosphere

Marcus Smith
This paper presents an analysis of the atmosphere of Callisto and discusses how the Jovian system molded, and continues to mold Callisto's atmosphere over time. Before the analysis the general properties of Callisto and the atmosphere is reviewed and a literature review of pertinent information regarding the Callisto's atmosphere and previous scientific simulations of the atmosphere. These simulations and observation data for the atmosphere provide a basis for all the parameters used in all of...

A computer program for producing synthetic non-LTE molecular spectra from astrochemical models

Joseph Epstein
Context: Molecular transitions can be observed and used to probe the physical and chemical conditions of molecular clouds, which are the building blocks for astrophysical structures. Aims: To provide a tool for analyzing the variation in molecular transition lines throughout a time-dependent chemical model, and for making comparisons between theoretical and observed molecular transitions in non-LTE astrochemical environments. Methods: Data from a time-dependent astrochemical model and its subsequent species abundances, calculated with the NAUTILUS code,...

On Measuring the Radial Velocity of Stars with Earth-Sized Planets

Colleen Casey
This project aimed to examine how Earth-sized exoplanets are found around stars using the radial velocity method. Calculations made using the method laid out in Fundamental Photon Noise Limit to Radial Velocity Measurements (Bouchy) attempted to find the quality factor for a synthetic spectrum, but had an error on the magnitude of 10^4, likely due to an error within the code. Using an interpolation function within Python, I recovered a radial velocity from an artificially...

A Fourier Domain “Jerk” Search for Binary Pulsars

Bridget Andersen
While binary pulsar systems are fantastic laboratories for a wide array of astrophysics, they are particularly difficult to detect. The orbital motion of the pulsar changes its apparent spin frequency over the course of an observation, essentially “smearing” the response of the time series in the Fourier domain. We review the Fourier domain acceleration search (FDAS), which uses a matched filtering algorithm to correct for this smearing by assuming constant acceleration for a small enough...

Using a Monte Carlo Simulation to Resolve Through Confusion the Radio Source Background of Weak Radio Sources Out to Z = 2.9

Melanie Grierson
This thesis details how to create a simulated universe on a 1000'' x 1000'' sky with 1'' x 1'' pixels. The simulated sky was created to provide a realistic distribution of radio sources given a specific source count and includes instrumental observing effects associated with the Karl G. Janksy Very Large Array (VLA). 1.4 GHz counts from Condon et al. (2012), which underwent a spline interpolation, were used to create ≈ 37k radio sources ranging...

Registration Year

  • 2018
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Resource Types

  • Text
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Affiliations

  • University of Virginia
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