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 20 of 27 for “"VLBI"”.
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Imagining active galactic nuclei with 3mm-VLBI
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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A comparison of two models used to predict atmospheric refraction in VLBI
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1979.
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Polarization VLBI monitoring of BL lacertae - kinematics, faraday effects and intermediate scale structure
… presents the results of a series of polarization VLBI experiments on the wellknown variable radio source BL Lacertae (BL Lac). VLBI provides the only means to study radio sources on scales 1 mas, and the sensitivity to polarization allows the magnetic field structures in the source to be …
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Positions and kinematics of quasars and related radio objects inferred from VLBI observations.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Localization and Lensing of Fast Radio Bursts using CHIME/FRB and its VLBI Outriggers
… its bursts. Very-long baseline interferometry (VLBI) is a solution which uses widely-separated telescopes to achieve high angular resolution, but this technique has been limited to following up the small fraction of sources which repeat. In this thesis, I develop key technologies to combine …
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Antenna axis offset and intersection determination using GPS
… utilises advanced space techniques such as VLBI to further the study of crustal motion as well as tidal and rotational deformations of the Earth. One of the parameters in the model used to determine the baseline length between VLBI stations, is the antenna axis offset. This offset is the …
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The Extragalactic Lens VLBI Imaging Survey (ELVIS) : investigating galaxy cores and black holes with gravitational lens central images
This thesis describes the Extragalactic Lens VLBI Imaging Survey (ELVIS), a search for central images in gravitational lenses. We present the first four ELVIS targets, for which we have radio VLBI observations with resolutions of a few milli-arcseconds and sensitivities of 15 - 38 Jy. For PMN …
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Controlling for the Ionospheric and Baseline-Offset Uncertainties in the CHIME/FRB Outriggers VLBI Network for Milliarcsecond Precision
… into a very long baseline interferometry (VLBI) array, drastically increasing the angular resolution of CHIME/FRB from arcminute to sub-arcsecond precision. In this work, I present my contributions to commissioning the CHIME/FRB VLBI Outrigger station located at the Green Bank Observatory …
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Testing general relativity using millimeter wavelength radio interferometry of Sgr A*
… the strong-field regime. Millimeter wavelength VLBI offers a unique opportunity to resolve the black hole structure on event-horizon scales. The ability of millimeter wavelength VLBI observations of Sgr A* to constrain black hole parameters such as mass, spin, and deviation from general …
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Radio-polarimetric observations of gravitational lenses
… under lensing. We performed high dynamic-range VLBI imaging polarimetry of the gravitational lens system B0218+357 at 43 GHz, and further VLBI observations of this system in the frequency range 8 GHz - 43 GHz. Further analysis included a low-frequency VLA study of the gravitational lens system …
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Improving the Resolution and Sensitivity of Microwave Astronomical Observations
… balloon-borne Very Long Baseline Interferometry (VLBI) station where I will be presenting my design and sensitivity requirements for the K-band receiver. While TolTEC will deliver science-ready maps of the linear Stokes parameters I, Q, and U in the short term, BVEX will serve as a proof of …
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The development of new methods for high resolution radio astronomy imaging
Very Long Baseline Interferometry (VLBI) polarisation observations of the relativistic jets from Active Galactic Nuclei (AGN) allow the magnetic field environment around the jet to be probed. In particular, multi-wavelength observations of AGN jets allow the creation of Faraday rotation measure …
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Exploring the faint source population at 15.7 GHz
… used recent Very Long Baseline Interferometry (VLBI) observations by Middleberg et al. with a resolution of $\approx$ 10 mas to investigate the properties of these faint 10C sources in the Lockman Hole and find that 33 out of the 51 10C sources in the VLBI field (65 percent) are detected by the …
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Probabilistic methods for radio interferometry data analysis
… this, we apply this method to a 5 GHz European VLBI Network (EVN) observation of the flaring blazar CGRaBS J0809+5341, to ascertain the presence of a jet emanating from its core, taking into account the imperfections in the station gain calibration performed on the data, especially on the …
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Sensing atmospheric water vapour using the global positioning system
… and very long baseline interferometry (VLBI). A high degree of correlation is observed in all instances of inter-technique comparison. The usefulness of GPS-derived slant delays is demonstrated by their ability to reduce VLBI inter-station baseline repeatabilities when they are included …
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Development of Software to Measure the Gravitational Redshift with RadioAstron
… redshift using RadioAstron – a space-VLBI mission launched in 2011 into a highly elliptical orbit. Utilizing the onboard H-maser frequency standard along with a Doppler compensation scheme that minimizes systematics, the gravitational redshift is anticipated to be determined with a …
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Spectral analysis of earth orientation results from Doppler tracking of the Navy Navigation Satellite System
… (SLR) and Very Long Baseline Interferometry (VLBI), and the Bureau International de l'Heure (BIR) Circular-Dare made. TwoChandler periods of data are analyzed beginning with the start of the Main MERIT Campaign in September 1983. The two major components, annual and Chandler wobble, are …
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The Structure and Polarization Properties of the SiO Masers in the Extended Atmosphere of R Aquarii
… of the star. Very Long Baseline Interferometry (VLBI) has shown that these masers do indeed lie close to the stellar surface at a distance of a few stellar radii. This extended atmosphere is a complex region dominated by stellar pulsations and permeated by circumstellar shocks. This dissertation …
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