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 15 of 15 for “"Broad line"”.
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Sonically induced narrowing of the NMR spectra of solids and other novel NMR techniques
… samples. For these the absorptions are typically broad, featureless and yield little information directly. This situation may be further exacerbated by the characteristically long T1 values of nuclei bound within a solid lattice which, consequently, require long inter-sequence delays that …
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Outflows and Dust in Quasars
… and thus arise from the inner parts of the broad line region. The strength of this emission is shown to correlate with the outflow properties. Second, I develop an SED model capable of reproducing the median observed photometric colours in the SDSS quasar population. This model is then used …
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Black hole masses and host galaxy properties in distant quasars from reverberation mapping surveys
… signatures between the accretion disk and the broad-line region (BLR). BH masses can be estimated by combining the BLR radius (inferred from the time delay) and the BLR velocity dispersion (measured from the broad-line width) under the virial assumption. The Sloan Digital Sky Survey …
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Automated methods for checking differential privacy
… is also a natural target for formal analysis. A broad line of work uses logical methods for proving privacy. However, these methods are not complete, and only partially automated. A recent and complementary line of work uses statistical methods for finding privacy violations. However, the methods …
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Reverberation mapping of Active Galactic Nuclei
… RM makes use of the time variability of the broad emission lines from the nearby broad-line region (BLR) to measure their time response or delay (τ) relative to the incident ionizing continuum from the accretion disc. This delay is a consequence of light-travel time effects and directly …
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Understanding the Nature of Blazars High Energy Emission with Time Dependent Multi-zone Modeling
… External radiation, which comes from the broad line region (BLR) or infrared torus, is included in the model. The results confirm that external Compton model can adequately describe the emission from red blazars. The emission from BLR is favored as the source of Inverse Compton seed …
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Hot planetary nebulae nuclei and related objects
… stellar properties suggest that narrow-line and broad-line O VI central stars belong to different mass-groups. We also calculate the nebular electron densities and distances for a larger sample of planetary nebulae and demonstrate the existence of correlations between the different …
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The Mössbauer effect in surface studies Fe57 on Ag
… contaminated the LiF. This experiment yielded a broad line which we interpret as a quadrupole split pair of lines due to a field gradient normal to the surface of about -4 x 1016 volts/cm2 e The Fe in Ag experiment gave a single narrow line shifted at room temperature (.056 + .002) cm/sec with …
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Digital technologies and environmental change : examining the influence of social practices and public policies
… and services affect the planet. Every line of code, every photo uploaded to ‘the cloud’, and every smartphone, computer, or ‘IoT’ device, has an environmental footprint. That footprint often takes the form of carbon dioxide emissions, ecosystem degradation, and resource depletion, each …
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Pulsed field gradient magnetic resonance measurements of lithium-ion diffusion
… sample characterization reveals two ⁷Li NMR lines distinguished by their static line widths and refocusing behavior. A modified version of the 1D EXSY selective inversion experiment is performed to characterize an exchange process between these two lines and extract their intrinsic …
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A near-infrared view of luminous quasars: black hole masses, outflows and hot dust
… to measure H$\beta$-based BH masses and narrow line region outflow properties. The cornerstone of this thesis has been a new near-infrared spectroscopic catalogue providing rest-frame optical data on 434 luminous quasars at redshifts $1.5 \lesssim z \lesssim 4$. At high redshift, $z \gtrsim 2$, …
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The Mass-Pitch Angle Relation for Three High Redshift Active Galaxies Selected from the GOODS Field
<p>As we continue to investigate and ponder the heavens, we have come to realize the presence of highly energetic gravitational wells at the center of all galaxies. These supermassive black holes at a galaxies nucleus formed in the company of the other features making up the galaxy, particularly …
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Broad-band spectral analysis of a complete sample of type 1 AGN detected by INTEGRAL
… IBIS spectra, providing for the first time a broad-band spectral analysis of a hard X-ray detected complete sample of type 1 AGN. The principal aim of this work is to study the continuum properties of type 1 AGN, i.e. power law slope, reflection fraction and high energy cut-off, and their …
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Reverberation Mapping of Supermassive Black Holes using Machine Learning
… traces reprocessing by the accretion disk and broad-line region (BLR). In this thesis, I develop and apply frequency-domain timing techniques based on Gaussian Process (GP) regression to study AGN reverberation across X-ray and UVOIR regimes. By modeling the empirical variability of AGN light …
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Spectroscopic and photometric observations and analysis of compact binaries
… objects and particularly to measure the emission lines parameters and to determine the radial velocities of the systems. For 2SXPS J062339.9− 265751, spectroscopy was undertaken using the SAAO 1.9 metre telescope. In addition, time series high speed photometry, over many epochs, was also obtained …