Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"High energy astrophysics"”.
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Characterization of single-sided cadmium zinc telluride strip detectors for high energy astrophysics applications
… semiconductor detector due to its good energy resolution, high atomic number, high density and good stopping power in the early 1990s. UNH has focused on developing CZT strip detector designs for astrophysical measurement applications in the 0.05 to 1 MeV photon energy range. This thesis …
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The X-ray and gamma-ray sky - Temporal, spectral and triangulation techniques for the characterization and localization of sources in High Energy Astrophysics
… where it is accreted with consequent emission of energy, visible mostly in the X-ray band. XTE J1810-189 is a LMXB hosting a neutron star (NS). I analyzed data of the NICER observatory from its 2020 outburst. The analysis revealed typical characteristics of Very-Faint X-ray Transients, systems …
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Radiative signatures of the jet launching region in astronomical objects
… of the most important unanswered questions in high-energy astrophysics. In this thesis, we investigate various aspects of jet launching by calculating the radiative properties of the inner accretion flow and jet launching region in a range of low-luminosity accreting black hole systems. We …
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Radial-zoned thermal accretion disk model around black holes
High energy astrophysics is a relatively new discipline that has witnessed tremendous advancement in the past 25 years or so with the advent of space technology, which provides the field with an indispensable observational tool in the X-ray and $\gamma$-ray range previously unreachable by …
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A high-frequency gravitational-wave burst search with LIGO's Hanford site
… general relativity, as well as new insight into high-energy astrophysics. As of yet there have been no confirmed direct observations of gravitational waves, the largest of which are expected to be near the limit of LIGO's sensitivity. Analyses of LIGO data face the challenge of distinguishing …
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Applications of Gaussian Processes at Extreme Lengthscales: From Molecules to Black Holes
… sciences data is scarce. Observation in high-energy astrophysics is disrupted by celestial occlusions and limited telescope time while laboratory experiments in synthetic chemistry and materials science are both time and cost-intensive. On the other hand, knowledge about the …
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Observational Properties of Gigaelectronvolt-Teraelectronvolt Blazars and the Study of the Teraelectronvolt Blazar RBS 0413 with VERITAS
… blazar jet is currently an essential question in high-energy astrophysics. A blazar spectral energy distribution (SED) has a typical double-peaked shape in the flux vs. energy representation. The low-energy component of the SED is well-studied and thought to be due to synchrotron emission from …
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Probing the Gamma-ray Emission from HESS Source RX J1713.7-3946
… from our the galaxy remains a major mystery in high energy astrophysics. Astronomy techniques, such as 𝛾-ray astronomy, have assisted us in coming closer to solving the problem, but many questions still remain unsolved. CRs are believed to produce 𝛾-rays via interactions with the interstellar …
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The XMM-Newton/SDSS galaxy cluster survey
… with the published ones of nearby clusters with higher temperatures and luminosities. The derived relation is still much steeper than that predicted by self-similar evolution. I also investigated the evolution of the slope and the scatter of the LX - T relation with the cluster redshift. After …
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Core-collapse supernovae in the great survey era
… by direct counting, in an unbiased way and with high statistics. Many science applications will therefore be feasible. Here, we discuss synergies with neutrino detectors, radio observations, and gamma-ray telescopes. The cumulative (anti)neutrino production from all core-collapse supernovae …
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The search for dark matter annihilation in galaxy clusters at VERITAS
… (WIMP) having a mass as low as ∼10 GeV to as high as ∼10 TeV. WIMPs are believed to be their own antiparticles and self-annihilate into a variety of lighter particles including γ-rays. Many direct detection, indirect detection, and direct production schemes have been proposed to search for the …
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Aspects of String Compactification
<p>This dissertation addresses some interesting problems in string compactification relevant to phenomenology, especially cosmological models derived from string theory Most attention is drawn to stabilizing the moduli and discussing the cosmology solutions given the effective potential obtained …
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Pulsating aurora: Source region & morphology
… aurora is a significant component of energy transfer within the framework of magnetosphere-ionosphere coupling. Further study of the morphology, total energy deposition, and the pulsation mechanism of pulsating aurora is key to a better understanding of our earth-sun system.</p>