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Relevant bibliographies by topics / Astronomy and Astrophysics / Dissertations / Theses

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Dissertations / Theses on the topic 'Astronomy and Astrophysics'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Castell, Pedro Ruiz. "Astronomy and astrophysics in Spain (1850-1914)." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432115.

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2

Kuutmann, Andrej. "Photo-evaporation of Globulettes : Numerical hydrodynamic studies of photo-evaporating low-mass globules in the Rosette Nebula." Thesis, Stockholm University, Department of Astronomy, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8354.

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<p>In this work, the long-term evolution of globulettes, low-mass globules found in H II regions, is studied through numerical hydrodynamic simulations. It has been proposed by Gahm et al. (2007) that these clouds may form free-floating planetary mass objects due to shock compression, caused by heating from the intense UV radiation of the central OB star cluster. To address this possibility, lifetimes are calculated for three different 3D simulated cases, similar to globulettes found in the Rosette Nebula. A plane-parallel approximation of the radiation field is used, as well as an inhomogeneo

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3

Brazler, Karen Tracy Susan. "TeV astronomy of millisecond pulsars." Thesis, Durham University, 1991. http://etheses.dur.ac.uk/5971/.

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This thesis is concerned with the detection of pulsed TeV γ-rays from millisecond pulsars. These stars appear to include some very efficient producers of high energy particles, but the mechanisms by which they produce TeV γ-rays are still a matter of debate. After an introductory section, there is a brief description of the principles used in the atmospheric Cerenkov technique. The design and operation of the University of Durham atmospheric Cerenkov telescopes are reviewed. The main analysis techniques used to search for periodic signals are then described. The effects on periodic signals of

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4

Harness, Anthony D. "High Contrast Astronomy with Starshades." Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245089.

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<p> One of the most important scientific discoveries to be had this century is the spectroscopic characterization of Earth-like exoplanets to determine the occurrence rate of worlds capable of supporting life and to potentially answer: are we alone in the universe? To accomplish these lofty goals requires an advancement in the technology to separate the overwhelming starlight from that of the exoplanet. I believe starshades are the key technology that will enable these discoveries within our lifetime. This dissertation work is a contribution to the advancement of starshade technology to put us

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5

Norton, Andrew John. "Galactic X-ray astronomy with EXOSAT." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/35751.

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The work presented in this thesis covers two topics: a study of Intermediate Polars (non- synchronously rotating magnetic cataclysmic variables) and a survey of the Galactic plane, both carried out with the EXOSAT observatory. The first part of the thesis describes a study of all the Intermediate Polars observed by EXOSAT. The X-ray light curves and spectra of each source are considered, with particular emphasis on the spin modulation. By treating the Intermediate Polars as an homogenous set of objects, a model for the accretion flow and emission region is developed in which the modulation is

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6

Birtwell, N. C. "Far infrared astronomy by balloon and satellite." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354218.

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7

Murphy, John Anthony. "A heterodyne array receiver for submillimetre wave astronomy." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373261.

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8

Carozzi, Tobia. "Radio waves in the ionosphere : Propagation, generation and detection." Doctoral thesis, Uppsala universitet, Institutionen för astronomi och rymdfysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1184.

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We discuss various topics concerning the propagation, generation, and detec-tionof high-frequency (HF) radio waves in the Earth's ionosphere. With re-gardsto propagation, we derive a full wave Hamiltonian and a polarization evo-lutionequation for electromagnetic waves in a cold, stratified magnetoplasma.With regards to generation, we will be concerned with three experiments con-ducted at the ionosphere- radio wave interaction research facilities at Sura, Rus-siaand Tromsø, Norway. These facilities operate high power HF transmittersthat can inject large amplitude electromagnetic waves into the

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9

Hills, Graeme Lawrence. "The application of polarimetric techniques to gamma ray astronomy." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243187.

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10

Yearworth, M. "A coded aperture telescope for low energy gamma-ray astronomy." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377798.

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11

Gonzales, Alexandria. "The Great Galactic Oversight - Characterizing the Most Numerous Stars in the Galaxy." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/scripps_theses/341.

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Stars with masses roughly less than half a solar mass, M stars, constitute 75% of all stars in the Galaxy. However, due to their enigmatic nature, it remains difficult to measure these stars' physical properties. This project performs such characterization through the investigation of eclipsing binary star systems. By utilizing precise photometric data from NASA's Kepler Mission, we present this study on all M star eclipsing binaries in the Kepler dataset. We modeled our selected targets' light curves using existing code and vetted our sample for prime candidates for radial velocity follow up.

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12

Mingarelli, Chiara Maria Francesca. "Gravitational wave astrophysics with pulsar timing arrays." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5117/.

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This thesis focuses on gravitational wave (GW) astrophysics with Pulsar Timing Arrays (PTAs). Firstly it is shown that anisotropy in the GW background may be present, and that its characterization at different angular scales carries important information. The standard analysis for isotropic backgrounds is then generalized by decomposing the angular distribution of the GW energy density into multipole moments. Generalized overlap reduction functions (ORFs) are computed for a generic level of anisotropy and PTA configuration. A rigorous analysis is then done of the assumptions made when calculat

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13

Hu, Yiming. "Novel inference methods for gravitational wave astrophysics." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6441/.

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With the development of more and more elegant and sensitive interferometric gravitational wave detectors, we are expecting the first direct detection of gravitational waves in a short time. This triggers huge interest to develop more powerful tools to perform data analysis on these signals, and to develop a good understanding of the analysis so that confident conclu- sions can be made. A further step would be to view into the future, as the first detections will boost the scientific demands for more powerful future generation detectors, which identifies the task of optimising the site of such

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14

Booker, Joseph J. "Characterizing the Role of Feedback and Protostellar Properties in the Orion Molecular Clouds." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501868933007357.

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15

Bradbury, Stella Marie. "Atmospheric Cerenkov astronomy of cataclysmic variables & other potential gamma ray sources." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5632/.

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Recent developments in the application of the atmospheric Cerenkov technique to 7-ray astronomy are reviewed here. These include new methods of signal to noise enhancement and the increasing diversity of stellar systems positively identified as Very High Energy 7-ray sources. Four Cataclysmic Variable systems were observed using the University of Durham Atmospheric Cerenkov telescopes during the course of 1990 and 1991. The statistical analysis performed in the search for a 7-ray signal, above a threshold energy of approximately 0-4 TeV, from three of these objects, H0253+193, EF Eridani and V

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16

Davis, Adam N. "Astrophysical Constraints on Fundamental Parameters in Physics and Astronomy." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1098973318.

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17

MANGIAGLI, ALBERTO. "The astrophysics of black hole binaries in the era of gravitational wave astronomy." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/299791.

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I buchi neri (BHs) sono oggetti variegati ed affascinanti in Natura. Il loro regno si estende dai buchi neri stellari con masse $sim 10-10^2 msun$ fino a BH supermassivi di $10^{9-10} msun$ al centro delle galassie. Mentre i primi sono il lascito dell'evoluzione stellare, i secondi sono il risultato di multipli merger di aloni di dark matter nella cosmologia $Lambda$CDM. Quando due BHs sono abbastanza vicini, formano una binaria (BHBs) ed emettono onde gravitazionali (GWs) che possiamo rilevare con i nostri interferometri. Come i BHs, anche le BHBs possono dividersi in diverse sottopopolazion

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18

Owens, Alan. "High resolution gamma-ray astronomy in the energy range 0.05 to 10 MeV." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/6755/.

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An analysis of the detection properties of an actively shielded 86cm (^3) germanium detector is given. Results are presented of observations of the Crab Nebula, its associated pulsar PSR0531+21, the Seyfert galaxy NGC1275, and the COS B source 2CG195+5. Evidence is presented for gamma-ray line emission from the Crab at energies of 404.7 and 1049.8 keV with intensities at the top of the atmosphere of (7.2 ± 2.1) x 10(^-3) and (2.03 ± 0.46) X 10(^-2) s (^-1) respectively. A line at 78.9 keV has also been detected at the 4.1o level which shows time variability. The peak flux at the top of the atm

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19

Valan, Vlasta. "Thermal components in the early X-ray afterglow of gamma-ray bursts." Licentiate thesis, KTH, Partikel- och astropartikelfysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217103.

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Gamma-ray bursts (GRBs) are still puzzling scientists even 40 years after their discovery. Questions concerning the nature of the progenitors, the connection with supernovae and the origin of the high-energy emission are still lacking clear answers. Today, it is known that there are two populations of GRBs: short and long. It is also known that long GRBs are connected to supernovae (SNe). The emission observed from GRBs can be divided into two phases: the prompt emission and the afterglow. This thesis presents spectral analysis of the early X-ray afterglow of GRBs observed by the {\it Swift} s

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20

AN, JIN HYEOK. "Astrophysics from binary-lens microlensing." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1029254036.

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21

Bryce, Helen M. "Gravitational microlensing as a diagnostic tool for stellar astrophysics." Thesis, University of Glasgow, 2001. http://theses.gla.ac.uk/3047/.

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Chapter One introduces the theory of galactic microlensing and develops the necessary formulae needed to discuss extended source events in the subsequent Chapters. Some of the complications encountered by groups observing such events are discussed, as are a few of the more notable events themselves. In Chapter Two an extended source model for microlensing is presented and applied to different atmosphere models, with different surface brightness profiles including simple one and two parameter limb darkening models and the more sophisticated and recently developed "Next Generation" stellar atmos

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22

Borgonovo, Luis. "Spectral and Temporal Studies of Gamma-Ray Bursts." Doctoral thesis, Stockholm : Department of Astronomy, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6793.

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23

Nymark, Tanja. "X-ray emission from supernova shock waves." Doctoral thesis, Stockholm : Department of Astronomy, Stockholm university, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6671.

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24

Hayes, Matthew. "Lyman-alpha imaging of starburst galaxies in the local universe and beyond." Doctoral thesis, Stockholm : Department of Astronomy, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7023.

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25

Henderson, Calen Barnett. "The Korean Microlensing Telescope Network:Expectations for a Cold Exoplanet Census through a Global Microlensing Survey." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1436490613.

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26

Carraminana, Alberto. "Very high energy gamma ray astronomy and non pulsating low mass X-ray binaries." Thesis, Durham University, 1991. http://etheses.dur.ac.uk/6241/.

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This thesis is concerned with non pulsating Low Mass X-Ray Binaries as Very High Energy γ-ray sources, in particular Scorpius X-1; the brightest of these objects in X-rays, and the most likely to be detectable at energies above 250 GeV. After a first introductory chapter, experimental techniques presently used in Very High Energy γ-ray Astronomy are reviewed. In the third chapter statistical techniques used to quantify count rate excesses and orbital modulations are described and applied to data from Scorpius X-1. Data taken in 1988 and 1989 showing a 3cr count excess, reported previously else

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27

Linder, Tyler R. "Rotational Study of Ambiguous Taxonomic Type Asteroids." Thesis, The University of North Dakota, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10616215.

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<p> Researchers have been categorizing asteroids by color for decades in an attempt to better understand asteroid composition and potential links to the meteorite population. However, only recently through large data collection surveys like the Sloan Digital Sky Survey (SDSS) has the asteroid population as a whole been studied. This research will look at a subset of asteroids with the highest reflectivity differences as reported by Carvano et al. (2010) in order to answer the question: Can visible wavelength ambiguous taxonomic asteroid types be an indicator of a non-homogeneous surface? </p>

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28

Lee, Aaron Thomas. "Star and Planet Formation through Cosmic Time." Thesis, University of California, Berkeley, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10619929.

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<p> The computational advances of the past several decades have allowed theoretical astrophysics to proceed at a dramatic pace. Numerical simulations can now simulate the formation of individual molecules all the way up to the evolution of the entire universe. Observational astrophysics is producing data at a prodigious rate, and sophisticated analysis techniques of large data sets continue to be developed. It is now possible for terabytes of data to be effectively turned into stunning astrophysical results. This is especially true for the field of star and planet formation. Theorists are now

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29

Bradshaw, Andrew Kenneth. "Lights All Askew| Systematics in Galaxy Images from Megaparsecs to Microns." Thesis, University of California, Davis, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10640482.

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<p> The stars and galaxies are not where they seem. In the process of imaging and measurement, the light from distant objects is distorted, blurred, and skewed by several physical effects on scales from megaparsecs to microns. Charge-coupled devices (CCDs) provide sensitive detection of this light, but introduce their own problems in the form of systematic biases. Images of these stars and galaxies are formed in CCDs when incoming light generates photoelectrons which are then collected in a pixel’s potential well and measured as signal. However, these signal electrons can be diverted fro

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30

Penna, Robert Francis. "Black Hole Accretion Disks and Jets: Connecting Simulations and Theory." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10929.

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In recent years, general relativistic magnetohydrodynamic (GRMHD) simulations have produced more realistic models for black hole disks and jets. However the complexity of the simulations has created a disconnect between simulations and theory: it is often unclear whether the simulated physics is correctly described by standard, semi-analytic disk and jet models. In this thesis, we describe new GRMHD simulations of black hole disks and jets. We compare the simulations to standard disk and jet models. We show that GRMHD thin disks are well described by the Novikov-Thorne model, and GRMHD jet

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31

Janowiecki, Steven. "The evolutionary status of high and extremely low surface brightness dwarf galaxies." Thesis, Indiana University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3718472.

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<p> Studying dwarf galaxies can shed light on the original building blocks of galaxy formation. Most large galaxies are thought to be built up over billions of years through the collisions and mergers of smaller galaxies. The dwarf galaxies we see today are the evolved remnants of those building blocks, and by understanding their nature and evolution, we can study the raw ingredients of galaxy formation. </p><p> Blue Compact Dwarf galaxies (BCDs) and Almost Dark galaxies are at opposite extremes of today's population of dwarf galaxies. BCDs are exceptionally compact and host very intense sta

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32

Petigura, Erik Ardeshir. "Prevalence of Earth-size Planets Orbiting Sun-like Stars." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3720767.

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<p> In this thesis, I explore two topics in exoplanet science. The first is the prevalence of Earth-size planets in the Milky Way Galaxy. To determine the occurrence of planets having different sizes, orbital periods, and other properties, I conducted a survey of extrasolar planets using data collected by NASA’s <i>Kepler Space Telescope</i>. This project involved writing new algorithms to analyze <i>Kepler</i> data, finding planets, and conducting follow-up work using ground-based telescopes. I found that most stars have at least one planet at or within Earth’s orbit and that 26%

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33

Rawls, Meredith Linwood. "Red giants in eclipsing binaries as a benchmark for asteroseismology." Thesis, New Mexico State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10141461.

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<p> Red giants with solar-like oscillations are astrophysical laboratories for probing the Milky Way. The <i>Kepler </i>Space Telescope revolutionized asteroseismology by consistently monitoring thousands of targets, including several red giants in eclipsing binaries. Binarity allows us to directly measure stellar properties independently of asteroseismology. In this dissertation, we study a subset of eight red giant eclipsing binaries observed by <i> Kepler</i> with a range of orbital periods, oscillation behavior, and stellar activity. Two of the systems do not show solar-like oscillations a

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34

Nelson, Erica June. "The Spatial Distribution of Star Formation in Galaxies| Observing the Emergence of Galactic Structure." Thesis, Yale University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10160870.

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<p>A high resolution measurement of the distribution of star formation within galaxies is key to understanding the emergence of galactic structure. The aim of this thesis is to understand how the structure of galaxies is built by developing a new method to spatially resolve their star formation. Using Ha maps for 2676 galaxies, this thesis shows where star formation is distributed in galaxies during the epoch 0.7 < <i>z</i> < 1.5 when a third of the total star formation in the history of the universe occurred. Across the star formation rate - stellar mass plane (the "main sequence"), sta

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35

Sun, Ai-Lei. "Active Galactic Nuclei Feedback and Galactic Out ows." Thesis, Princeton University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10167547.

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<p> Feedback from active galactic nuclei (AGN) is thought to regulate the growth of supermassive black holes (SMBHs) and galaxies. The most direct evidence of AGN feedback is probably galactic outflows. This thesis addresses the link between SMBHs and their host galaxies from four different observational perspectives. First, I study the local correlation between black hole mass and the galactic halo potential (the <i>M</i><i>BH</i> – <i> V</i><sub>c</sub> relation) based on Very Large Array (VLA) HI observations of galaxy rotation curves. Although there is a correlation, it is no tighter

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36

Garmilla, Jose Antonio. "Star/Galaxy Separation in Hyper Suprime-Cam and Mapping the Milky Way with Star Counts." Thesis, Princeton University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10167596.

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<p> We study the problem of separating stars and galaxies in the Hyper Suprime-Cam (HSC) multi-band imaging data at high galactic latitudes. We show that the current separation technique implemented in the HSC pipeline is unable to produce samples of stars with <i>i</i> 24 without a significant contamination from galaxies (> 50%). We study various methods for measuring extendedness in HSC with simulated and real data and find that there are a number of available techniques that give nearly optimal results; the extendedness measure HSC is currently using is among these. We develop a star/galaxy

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37

Tie, Suk Sien. "Lyman-alpha forest cosmology with the Dark Energy Spectroscopic Instrument (DESI)." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594035656891479.

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38

Assef, Roberto Jose. "Properties of Active Galactic Nuclei and Galaxies: Spectral Energy Distributions, Luminosity Functions and Black Hole Masses." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281369360.

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Nataf, David M. "The Galactic Bulge Stellar Population." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343225619.

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40

Brown, Justin Michael. "Abundance of Chlorine in H₂ Poor Diffuse Interstellar Clouds." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431040914.

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MA, ZHIBO. "THE SEGUE K Giant Survey." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1444844561.

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42

Zhu, Wei. "Microlens Mass Determinations from Space-based Parallax." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1498472350212665.

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Villanueva, Steven Jr. "Understanding Hot Jupiters with the DEdicated MONitor of EXotransits and Transients (DEMONEXT)." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531488771229221.

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Trucks, Jesica Lynn. "A Variability Study of Y Dwarfs: A Spitzer Space Telescope Program." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564689621551064.

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Li, Pengfei. "The Dark Matter Problem in Rotationally Supported Galaxies." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case159440473976029.

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Fernandes, Joshua M. "Physical and chemical properties of Jupiter's north and south polar vortex revealed through mid-infrared imaging." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10263309.

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<p> This thesis reports on the characterization of the thermal and chemical distribution of Jupiter’s polar regions. The quantities are derived from mid-infrared images covering all longitudes at unprecedented spatial resolution using the COMICS instrument at the Subaru Telescope on the nights of January 24 and 25, 2016. Because of Jupiter’s slight axial tilt of 3° and low angular resolution and incomplete longitudinal coverage of previous mid-infrared observations, the physical and chemical properties of Jupiter’s polar regions have been poorly characterized. In advance

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Pascut, Aurelia. "Evolution of X-ray Properties of Galaxy Groups." Thesis, University of Birmingham (United Kingdom), 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10591255.

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<p> Studies of scaling relations in groups and clusters of galaxies have shown that the X-ray properties of groups deviate the most from the self-similar prediction. This is because groups are more affected by non-gravitational processes due to their shallower potential well, a behaviour which makes groups an ideal class of systems for the study of the impact of feedback. From the observational point of view, the study of the X-ray properties of groups, especially at high redshifts is hindered by their lower surface brightness compared to their more massive counterparts. We present the result

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McCord, Krista. "Coupling Semi-Analytic Models and N-Body Simulations| A New Way of Making Galaxies and Stellar Halos." Thesis, The University of Alabama, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10240760.

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<p> Stellar halos give insight into the initial conditions that existed when a host galaxy first formed and provide details on disrupted satellites via their different stellar populations. An algorithm that is computationally inexpensive compared to hydrodynamic simulations is necessary in order to theoretically study the structure and formation of galactic stellar halos in sufficient detail to probe substructure. CoSANG (Coupling Semi-Analytic/N-body Galaxies) is a new computational method that we are developing which couples pure dark matter N-body simulations with a semi-analytic galaxy for

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Folsom, Colin Peter. "Magnetic, chemical and rotational properties of the Herbig Ae/Be binary system HD 72106." Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/685.

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Rosen, Anna L. "The Destructive Birth of Massive Stars & Massive Star Clusters." Thesis, University of California, Santa Cruz, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10274404.

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<p> The injection of energy and momentum into the interstellar medium by young massive stars’ intense radiation fields and their fast, radiatively driven winds can have a profound influence on their formation and environment. Massive star forming regions are rare and highly obscured, making the early moments of their formation difficult to observe. Instead, we must turn to theory to elucidate the physics involved in the formation of massive stars and massive star clusters (MSCs), which can host thousands of massive stars. In my thesis, I developed analytical and numerical techniques to s

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