Now showing items 11-30 of 34

    • A Ground-Based Search for Transit Timing Variations from the Apache Point Observatory 

      Kundurthy, Praveen (2013-02-25)
      The following dissertation presents work done as part of a ground-based transit follow-up program designed to look for transit timing variations in well-known transiting systems called, the Apache Point Survey of Transit ...
    • HI selected galaxies in the Sloan Digital Sky Survey 

      West, Andrew Alan, 1977- (2005)
      We present the results from a study of HI selected galaxies that fall within both the HI Parkes All Sky Survey (HIPASS) and the Sloan Digital Sky Survey (SDSS). By comparing the optical properties derived from the SDSS ...
    • A hyperbolic tetrad approach to numerical relativity 

      Buchman, Luisa T (2003)
      An in-depth numerical study using 3 + 1 formulations of the Einstein equations for 1D colliding plane waves reveals factors which increase accuracy and stability: using "mixed" variables, hyperbolicity, satisfying the ...
    • Karhunen-Loeve Analysis for Weak Gravitational Lensing 

      VanderPlas, Jacob T. (2013-02-25)
      In the past decade, weak gravitational lensing has become an important tool in the study of the universe at the largest scale, giving insights into the distribution of dark matter, the expansion of the universe, and the ...
    • The Milky Way in SDSS and in N-body Models 

      Loebman, Sarah Rose (2013-11-14)
      In this thesis, I present a comparison between recent Sloan Digital Sky Survey (SDSS) Galactic studies and N-body simulations to aid in the interpretation of observed structural features. I investigate the origin of the ...
    • Modeling the Extragalactic Epoch of Reionization Foreground 

      Carroll, Patricia A.
      The Epoch of Reionization represents a largely unexplored yet fundamental chapter of the early universe. During this period, spanning several hundred million years, the first stars and galaxies formed and the Hydrogen-dominated ...
    • Observational Constraints on Models of Rapidly Evolving Luminous Stars 

      Rosenfield, Philip Arthur (2014-02-24)
      Resolved stellar populations in galaxies are excellent laboratories for testing our understanding of galaxy formation, integrated colors and luminosities, supernova progenitor masses, and energy input from stellar feedback. ...
    • The optical counterparts of the luminous x-ray binary stars in globular clusters 

      Deutsch, Eric W (1998)
      Ten percent of our Galaxy's luminous (LX≳1036 ergs-1 ) X-ray point sources are located in globular clusters (GCs), but globular clusters contribute a much smaller fraction of normal stars to the Galaxy. X-ray bursts ...
    • The Optical Variability of Quasars as Seen by SDSS 

      MacLeod, Chelsea Louise (2012-09-13)
      I provide a quantitative analysis of the database of 3.5 million photometric measurements for 80,000 spectroscopically confirmed quasars recently assembled by the Sloan Digital Sky Survey (SDSS). This database is an excellent ...
    • Physical conditions in giant extragalactic H II regions 

      Skillman, Evan David (1984)
      Giant Extragalactic H II Regions (GEHRs) in nearby galaxies have been observed at both radio and optical wavelengths. Narrow band optical imaging, large and small aperture optical spectrophotometry, radio continuum imaging ...
    • Properties of Stellar Clusters and their Relation to Molecular Gas in the Andromeda Galaxy 

      Beerman, Lori Christine
      The apparent age and mass of a stellar cluster can be strongly affected by stochastic sampling of the stellar initial mass function, when inferred from the integrated color of low mass clusters ($\lesssim$ $10^4$ $M_{\odot}$). ...
    • Pulling Back the Veil: The Characterization and Habitability of Enshrouded Worlds 

      Arney, Giada Nicole
      This dissertation explores global atmospheric haze and cloud layers and shows that they are not impenetrable barriers to information about the lower atmosphere and surface environment of planets. Uncovering techniques to ...
    • Resolved Stars' Insights into Galaxy Physics 

      Choi, Yumi
      The history of a galaxy is encoded in its individual stars, and resolved stellar populations in nearby galaxies provide a wealth of information about star formation history (SFH), its relation to the interstellar medium, ...
    • Self-Interacting Dark Matter in Cosmological Simulations 

      Fry, Alexander Bastidas
      Self-Interacting Dark Matter is a cosmologically consistent alternative theory to Cold Dark Matter that solves problems of the Cold Dark Matter model on small scales. Our N-body simulations demonstrate that Self-Interacting ...
    • Simulating and Characterizing the Pale Blue Dot 

      Robinson, Tyler David (2013-02-25)
      The goal of this work is to develop and validate a comprehensive model of Earth's disk-integrated spectrum. Earth is our only example of a habitable planet, or a planet capable of maintaining liquid water on its surface. ...
    • Spots and Flares: Stellar Activity in the Time Domain Era 

      Davenport, James Robert Arthur
      Time domain photometric surveys for large numbers of stars have ushered in a new era of statistical studies of astrophysics. This new parameter space allows us to observe how stars behave and change on a human timescale, ...
    • Star Cluster Formation Efficiency in the Andromeda Galaxy 

      Johnson IV, Lent Clifton
      This work revolutionizes the study of star clusters in the Local Group galaxy Andromeda (Messier 31) using high spatial resolution, multi-wavelength imaging from the Hubble Space Telescope obtained as part of the Panchromatic ...
    • Star Formation in N-Body + SPH Simulations 

      Munshi, Ferah (2014-02-24)
      The primary focus of my thesis work is to study star formation using a series of high resolution cosmological N-body Simulations. Specifically, I have studied the total stellar-to-halo mass ratio as a function of halo mass ...
    • The High-Redshift Quasar Luminosity Function from Multi-Epoch Imaging Surveys 

      AlSayyad, Yusra
      Upcoming time-domain imaging surveys such as the LSST will detect over a million high-redshift z > 4 quasars, making complete spectroscopic followup unfeasible. Statistical estimates such as luminosity functions and ...
    • The Little Galaxies That Could Reionize the Universe 

      Anderson, Lauren
      The sources that reionized the universe are still unknown, but likely candidates are faint but numerous galaxies. In this paper we present results from running a high resolution, uniform volume simulation, the Vulcan , to ...