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 5 of 5 for “"lensed quasars"”.
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New optical surveys for gravitationally lensed quasars
… four new optical surveys for gravitationally lensed quasars. The goal of this work has been to (1) explore new strategies for conducting optical surveys, especially in the southern hemisphere, in the hopes of "fine-tuning" the survey techniques toward finding systems of particular scientific …
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Discovery and Characterisation of Gravitationally Lensed Quasars in Wide-field Surveys
… since the discovery of the first gravitationally lensed quasar, and dedicated spectroscopic and imaging surveys have added over one hundred new systems to this list. In recent years, the amount of available data across the whole-sky has grown exponentially. Full-sky data from X-ray to radio …
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Characterising the Gravitationally Lensed Quasar Population
Understanding the co-evolution of quasars and their host galaxies remains one of astronomy's biggest questions. Observing the quasar and its host galaxy at low redshifts is relatively straightforward. However, this becomes more complex at higher redshifts. One method to study this co-evolution is …
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Zooming in on quasar accretion disks using chromatic microlensing
… have prevented such a measurement for distant quasars. We present a new method for determining the size of quasar accretion disks at a range of wavelengths, thus constraining their temperature profiles. The technique uses single-epoch, multi-wavelength optical and nearinfrared imaging of …
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Automating Searches for Gravitationally Lensed AGN in Wide-Field Surveys
… in 1979. This thesis focuses on searches for lensed systems where the background source is an active galactic nucleus (AGN) - a galaxy powered by their central supermassive black hole (SMBH). Gravitational lensing of the most distant and luminous subclass of AGN, known as quasars, provide a …