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Relevant bibliographies by topics / X-ray astronomy / Dissertations / Theses

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Dissertations / Theses on the topic 'X-ray astronomy'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

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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2

Martindale, Adrian. "Novel X-ray instrumentation for astronomy." Thesis, University of Leicester, 2008. http://hdl.handle.net/2381/3964.

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This thesis describes experimental and theoretical work and technology development directed towards the next generation of X-ray astronomical instrumentation. A great heritage exists of instruments which are sensitive to X-rays which operate on board space based observatories. The next generation of such telescopes will take advantage of the rapid technology advancement of the last four decades of more accurately observe the universe and give greater insight into the objects within it, how they formed and how they will evolve. Chapters 2 and 3 describe the investigation of extremely high speed

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3

Butcher, Jacqueline Anne. "Extragalactic X-ray astronomy with GINGA." Thesis, University of Leicester, 1994. http://hdl.handle.net/2381/35850.

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4

Trowell, Stephen P. "Transition-edge sensors for X-ray astronomy." Thesis, University of Leicester, 2001. http://hdl.handle.net/2381/30653.

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This thesis considers the development of a cryogenic Transition Edge Sensor (TES) microcalorimeter for X-ray astronomy. An optimum configuration for this application has yet to be established and some of the design criteria and fabrication methods are discussed on Chapter 5. Results from investigations into different TES material combinations are presented in Chapter 6. Degradation due to interdiffusion between materials has an impact on the reliability of TES detectors and analysis of Al/Ag, Ti/Au, Cu/Nb and Ir/Nb systems has formed a large part of our recent work. Such comparisons show the r

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5

Ferguson, Colin. "Mass modelling in X-/#gamma#-ray astronomy." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327364.

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6

Court, A. J. "Hard X-ray astronomy from balloon altitudes." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377796.

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7

Spooner, Neil John Curwen. "New techniques in hard X-ray astronomy." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38166.

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8

Cohen, Matthew (Matthew L. ). "Active pixel sensors for X-ray astronomy." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34370.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>MIT Institute Archives copy: pages 151-158 bound in reverse order.<br>Also issued in leaves.<br>Includes bibliographical references (p. 155-158).<br>An active pixel sensor array, APS-1, has been fabricated for the purpose of scientific x-ray detection. This thesis presents the results of testing the device. Alternate design architectures are explored. Recommendations are made for a next-generation sensor. CCDs have been the dominant x-ray sensor in astronomy for over ten years.

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9

Rideout, Robert Martin. "Coded imaging systems for X-ray astronomy." Thesis, University of Birmingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364854.

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10

Gavriil, Fotis Panagiotis. "Magnetar-like x-ray bursts from anomalous x-ray pulsars." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100371.

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The leading model for understanding the energetics of anomalous X-ray pulsars (AXPs) is that they are "magnetars"---young, isolated neutron stars powered by the decay of their enormous magnetic fields. The identification of AXPs as magnetars is motivated by the similarity of AXPs to another enigmatic class of sources, the Soft Gamma Repeaters (SGRs). We report on long-term monitoring of AXPs using the Rossi X-ray Timing Explorer (RXTE). We monitor AXPs with RXTE to study their rotational stability, to search for variations in their pulsed flux and pulsed morphology. During our regular monitori

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11

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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12

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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13

Bale, Greg. "CdZnTe radiation detectors for hard X-ray astronomy." Thesis, University of Leicester, 2001. http://hdl.handle.net/2381/30645.

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This thesis is concerned with the development of CdZnTe compound semiconductor detectors for hard X-ray astronomy. The advent of multilayer coated focusing optics for hard X-rays creates the need for compact solid-state X-ray detectors with substantial quantum efficiency above 10 keV. CZT is a material with the necessary properties to meet the requirements. Excellent results from commercially obtained CdZnTe detectors are presented in Chapter 4 of this work. Low-noise preamplifiers and Peltier coolers were employed to obtain high-resolution X-ray and gamma-ray spectra over the 2 - 60 keV energ

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14

Fraser-Mitchell, J. N. "An imaging detector for hard X-ray astronomy." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383420.

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15

Mongrard, Olivier 1976. "High-accuracy foil optics for X-ray astronomy." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/82233.

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16

Mullerworth, Stephen Derek. "Position sensitive detectors for hard X-ray and gamma-ray astronomy." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386646.

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17

Pleasants, Ian Blair. "Detector elements for hard X-ray and gamma-ray astronomy applications." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262152.

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18

Bird, Antony John. "A position-sensitive detector for hard X-ray astronomy." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292524.

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19

Zhang, Shuang Nan. "Instrumentation and data analysis for hard X-ray astronomy." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252689.

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20

Smith, David Alan. "A study of photon counters for X-ray astronomy." Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/35791.

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21

Gavriil, Fotis P. "Long-term monitoring of anomalous X-ray pulsars with the rossi x-ray timing explorer." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33763.

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We report on the long-term monitoring of five anomalous X-ray Pulsars (AXPs) using the Rossi X-ray Timing Explorer (RXTE ). We present a phase-coherent timing ephemeris for 4U 0142+61, and show that it has rotated with high stability over 4.4 yr, with RMS phase deviation of 7% of the pulse period from a simple fit including only n and n&d2; . We show that 1E 1048.1-5937 shows significant deviations from simple spin-down such that phase-coherent timing has not been possible over time spans longer than a few months. We find that the deviations from simple spin down are not consistent with single

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22

Collins, David J. "X-ray observations of cataclysmic variables." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3653/.

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Cataclysmic variables are close binary systems where mass is accreted onto a white dwarf through an accretion disc. Approximately half the gravitational energy in the disc is released in a boundary layer as X-rays. X-rays originate from matter under the extreme and energetic conditions and provide a unique view of high energy processes. X-ray luminosities are sensitive to the accretion rate through the disc and to the conditions in the inner accretion zone. Accretion discs are wide spread throughout astronomy. The extraction of potential energy from accreted material is known to be the princip

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23

Schurch, Matthew Peter Edward. "Optical and X-ray studies of Be/X-ray binaries in the Small Magellanic Cloud." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/66188/.

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High-mass X-ray binaries (HMXBs) have proved to be some of the most interesting X-ray sources in the sky. The growing opulation of Small Magellanic Cloud (SMC) Be/X-ray binaries is monitored weekly with two 15ks RXTE observations. My thesis focuses on presenting the analysis of the X-ray data and the optical follow-up that enhances it. I present detailed studies of the H emission features in several prominent Be/X-ray inaries in the SMC and examine their outbursting nature by combining the OGLE optical light curves with the RXTE light curves. This has culminated in an orbital solution for SXP1

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24

Baskill, Darren Stuart. "X-ray properties of cataclysmic variable stars." Thesis, University of Leicester, 2003. http://hdl.handle.net/2381/30669.

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In this thesis, I study the entire sample of non-magnetic cataclysmic variables observed with the Japanese satellite ASCA, presenting a detailed analysis of the spectral and temporal behaviour of these twenty-nine targets. The spectral analysis indicates that all the targets in the ASCA sample appear to be X-ray under-luminous, with only three possible exceptions. This indicates that energy is being lost from the accretion disk in a non-radiative way. Since a third of the observations require additional absorption above that expected from interstellar alone, both the X-ray under-luminosity and

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25

Marshall, Kevin. "The X-ray Variability of Seyfert Galaxies." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/phy_astr_diss/11.

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Strong and variable X-ray emission has long been known to be a universal property of active galaxies. However, despite years of study, the exact nature of the variability remains relatively unknown. We present here results of a multi-year monitoring campaign of a sample of Seyfert galaxies (3C 120, Mkn 509, 3C 390.3, and Akn 120), carried out using the Rossi X-ray Timing Explorer (RXTE). For Mkn 509, we also present results of optical monitoring. Mkn 509 shows a strong correlation between X-ray and optical variations, with the optical leading the X-ray by 25 days. We also investigate the r

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26

Kara, Erin. "X-ray reverberation around accreting black holes." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709535.

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27

Hoffman, Kelsey L. "A study of X-ray observations of Aquila X-1 /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99184.

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The goal of this thesis is to obtain the most precise radius measurement of the neutron star in Aql X-1. In order to measure the radius, nine new observations have been analyzed along with four previously analyzed observations. Two of the new observations were taken with XMM-Newton. During the times of the XMM-Newton observations Aql X-1 was found not to be in quiescence and so cannot be used for radius measurements. This state of active accretion of Aql X-1 is characterized by basic spectral analysis. Spectral lines from Aql X-1 were investigated using the Reflection Grating Spectrometer (RGS

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28

Wang, Yu, and 王禹. "Non-thermal X-ray and soft gamma-ray radiation from the young pulsars." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/196467.

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This thesis focuses on the radiation mechanisms of non-thermal X-rays and soft gamma-rays of two types of thousands year old spin-down powered pulsars. The thousands year old pulsars have distinct radiation behaviors from the middle-aged gamma-ray pulsars. In the magnetosphere of the pulsar, the particles are accelerated by the electric field resulting from the rotation of the neutron star. These accelerated particles move along the magnetic field lines and emit GeV gamma-ray curvature photons. For the middle-aged pulsars, most of the curvature photons, whose observed spectra are described wel

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29

O'Sullivan, Ewan. "X-ray properties of early-type galaxies." Thesis, University of Birmingham, 2002. http://etheses.bham.ac.uk//id/eprint/76/.

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It has been known for some time that many early–type galaxies possess halos of X–ray emitting gas. However, the properties of these halos and the processes by which they form are as yet not well understood. We have compiled the largest catalogue of X–ray luminosities to date, and use it to examine the relationships between X–ray luminosity and galaxy age, environment and optical luminosity. It is shown that the mass of the X–ray halo increases with galaxy age, and that there is no trend in LX/LBwith environment. Group dominant galaxies are shown to be more X–ray luminous than galaxies in other

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30

Plant, Daniel. "X-ray spectroscopy of accreting black holes." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/371747/.

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Measuring black hole spin has become a key topic in astrophysics, and recent focus on the spin powering of jets in X-ray binaries has heightened the need for accurate measurements of spin. However, the effects of spin are subtle, and are only imprinted on emission from very close to the black hole. This is revealed since the black hole spin defines the radius of the last stable orbit of the accretion disc, which is smaller for larger spin. Recent advances in X-ray observatories and spectroscopic techniques have enabled spin estimates for a number of black holes in X-ray binaries,but the accura

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31

Pearce, Sarah Elizabeth. "Sybchrotron calibration of microchannel plate detectors for X-ray astronomy." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30605.

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This thesis describes the calibration of CsI- and KBr-coated microchannel plate (MCP) detectors using the Daresbury Synchrotron Radiation Source (SRS). This work was carried out as part of the calibration programme for the Advanced X-ray Astrophysics Facility (AXAF). The AXAF High Resolution Camera (HRC) consists of two MCP detectors: HRC-I, optimised as an imaging detector, and HRC-S, optimised as the read-out detector for a dispersive spectrometer. Accurate knowledge of the MCP quantum efficiency (QE) variation with energy is particularly important for HRC-S so that atomic absorption edge-re

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32

Rochford, James. "Development of cryogenic semiconductor microcalories for spectroscopic X-ray Astronomy." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402450.

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33

Allen, Steven Ward. "An X-ray study of the intracluster medium." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309330.

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34

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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35

Dib, Rim. "An RXTE archival search for coherent -X-ray pulsations in low mass x-ray binary 4U 1820-30 /." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80253.

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As part of a large-scale search for coherent pulsations from LMXBs in the RXTE archive, I have completed a detailed series of searches for coherent pulsations of 4U 1820--30---an ultracompact LMXB with a binary period of 11.4 minutes located in the globular cluster NGC 6624. The small binary period leads to a very high acceleration, so I used phase modulation searches as well as acceleration searches to give significant sensitivity to millisecond pulsations. I searched a total of 34 archival RXTE observations, 32 of which had an on-source integration time longer than 10 ks, and some of

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36

Guillot, Sebastien. "An «XMM» search for quiescient low -mass x-ray binaries in globular cluster using x-ray spectral identification." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66924.

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Low-mass X-ray binaries (LMXBs) are now routinely used for neutron star (NS) radius measurements. Observations of these systems in their quiescent stage (qLMXB) is one method leading to precise measurements. However, the dominant source of uncertainty on the NS radii remains the distance to the binary systems. Globular clusters (GCs) are therefore the places to look for more qLMXBs, due to their known or measurable distances and their abundance of binary systems. This thesis reports the discovery of seven candidate qLMXBs in six GCs, using observations from the XMM-Newton sat

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37

Dusoye, Avishek. "Accretion and outflow in black-hole x-ray binaries." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15518.

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Black hole X-ray binaries (BHXBs) are stellar binary systems consisting of a black hole (BH) and a companion star. They are known to produce X-ray emission through the accretion of mass from the companion star onto the black hole via an accretion disc, as well as radio emission originating from their jets. My thesis splits into two projects. On one hand, I focus on the connection between the X-ray emitting accretion disc and the radio jets of BHXBs in general, by studying the quasi-simultaneous evolution of the radio fluxes and the X-ray fluxes from 17 BHXBs. This connection, also known as the

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38

Gonzalez, Marjorie. "X-ray observations of young neutron stars." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18813.

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The extreme physical properties of neutron stars make them efficient emitters at all wavelengths of the electromagnetic spectrum and, traditionally, they have been extensively studied at radio wavelengths. The neutron stars with the highest estimated magnetic fields (so-called "magnetars") have remarkably different characteristics from the rest of the population: they emit no persistent radio emission but show large amounts of high-energy radiation that is thought to be powered by their large magnetic fields. For this thesis we have studied the X-ray emission properties of various types of you

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39

Lobban, Andrew. "X-ray spectral variability of Seyfert galaxies." Thesis, Keele University, 2013. http://eprints.keele.ac.uk/15/.

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40

Holland, Andrew David. "Radiation effects in CCD X-ray detectors." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/27614.

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The outcome of several studies into future X-ray astronomy satellite missions has favoured the approach of using grazing incidence optics in conjunction with Charged Coupled Devices (CCD's) as focal plane detectors. This approach allows astrophysical investigation of unprecedented sensitivity by maximising source detectability and by resolving the source spectra. This thesis covers work performed in the development and evaluation of EEV CCD's for use as focal plane X-ray detectors. Due to the nature of the space environment, the interactions of radiation with CCD's also form a major part of th

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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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42

Pascut, Aurelia. "Evolution of X-ray properties of galaxy groups." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6235/.

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This thesis presents the results from the Chandra Deep Group Survey, a survey dedicated to find high redshift groups of galaxies in deepest observations available in the Chandra archive. The catalogue compiled from this survey contains 26 groups and 36 clusters with available redshifts, with largest redshift being 1.3. This sample has been used to investigate the evolution of the thermal state of the gas at the centre of groups and compare this evolution to that of clusters. Different parameters have been used to quantify the strength of cool cores and it has been showed that groups and cluste

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Slack, Nathan William. "Simulations for the International X-ray Observatory." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1576/.

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The subject of this thesis is the simulation of X-ray cluster surveys and related issues, with a focus on the research that can be conducted with the International X-ray Observatory (IXO), or a similar next-generation X-ray observatory. A general purpose X-ray image simulator has been developed. It uses a modern cosmological simulation and cluster scaling relations to produce simulated cluster images that are well motivated by theory and observation. A distribution of point sources and various instrumental effects are also included. The simulator is complemented by a source identification meth

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44

Phillips, Sam. "Effects of irradiation in low-mass X-ray binaries." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365774.

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Murray, Neil John. "Improvements to MOS CCD technology for future X-ray astronomy missions." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/3316.

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This thesis is concerned with the development of MOS charge-coupled device (CCD) technology for future applications in X-ray astronomy. Of particular interest is increased detection efficiency of high energy X-ray photons and increased pixel readout speed for large area sensors. Chapter 2 reviews the generation of X-rays, methods for extra-terrestrial X-ray observations, detectors and provides an overview of X-ray astronomy missions. Chapter 3 discusses the CCD and introduces some of the recent technological developments that improve their overall performance for optical and X-ray photon detec

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46

Day, Charles Samuel Reuben. "EXOSAT observations of Her X-1 and Cen X-3." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279912.

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47

Townsend, Lee John. "An X-ray, optical and infra-red study of high-mass X-ray binaries in the Small Magellanic Cloud." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/337555/.

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The known population of high-mass X-ray binaries in the Small Magellanic Cloud is continually growing and is now a similar size to that of the Milky Way, despite a significant mass difference between the two galaxies. In this thesis, I present multi-wavelength observations of Be/X-ray binaries that have undergone an outburst during the past three years, including the discovery of new systems and extended outbursts from previously known sources. The results are discussed in terms of both the underlying physics of individual outbursts and how the growing SMC population is helping our understandi

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Dib, Rim. "RXTE monitoring of 5 anomalous x-ray pulsars." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66730.

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Anomalous X-ray Pulsars (AXPs) are a group of neutron stars that share several common properties. They are dubbed "anomalous'' because their observed luminosity exceeds the rate of loss of their rotational kinetic energy. According to the magnetar model, they are young, isolated neutron stars, powered by a large magnetic energy reservoir. Five of these AXPs (1E 2259+586, 4U 0142+61, RXS J170849.0-400910, 1E 1841-045, 1E 1048.1-5937) have been monitored with the Rossi X-ray Timing Explorer (RXTE) since 1997 (1998 for two of the sources). The goal of the monitoring program is to stud

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49

Tang, Pui-shan Anisia, and 鄧佩姗. "Thermal X-ray pulses resulting from pulsar glitches." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B29790992.

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Tang, Pui-shan Anisia. "Thermal X-ray pulses resulting from pulsar glitches /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2089675X.

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