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.
Results
Showing 1 to 20 of 120 for “"AGN"”.
-
The evolution of galaxies and AGN
… regarding the evolution of galaxies and AGN. We first argue that the bright submillimetre number counts may be dominated by obscured AGN rather than ultraluminous starbursts. Through statistical analyses of the ECDFS and WHDF, we show that N_H > 10^22 cm^−2 AGN are typically bright at …
-
Spitzer's Contribution to the AGN Population
… multiwavelength datasets, we study obscured AGN in the distant universe that have been missed via traditional selection techniques (e.g. UV/ optical/X-ray). To do so, we take particular advantage of the mid-IR, which is minimally affected by obscuration. We first select as AGN candidates …
-
AGN outflows and the cluster cooling flow conundrum
… molecular clouds. Active galactic nuclei (AGNs) are thought to be able to counter catastrophic cooling. This thesis provides an overview of the theory and design philosophy of hydrodynamical simulations and a hydrodynamical code called FLASH, which was created by Fryxell et al. (2000). This …
-
Optical surveys of AGN and their host galaxies
… rests on two large Active Galactic Nuclei (AGNs) surveys. The first survey deals with galaxies that host low-level AGNs (LLAGN) and aims at identifying such galaxies by quantifying their variability. While numerous studies have shown that AGNs can be variable at all wavelengths, the nature …
-
On the Distances and Energetics of AGN Outflows
Active galactic nuclei (AGN) ubiquitously show outflows. It is now widely recognized that these outflows are key components in the evolution of super-massive black holes and their host galaxies. As important as these outflows are, we still lack sufficient understanding of their structure and …
-
Automating Searches for Gravitationally Lensed AGN in Wide-Field Surveys
… 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 unique way to study the universe. They have been used to constrain the …
-
The complex interplay between AGN jet feedback and galaxy evolution
… emanating from these active galactic nuclei (AGN). Whilst the clearest observational signatures of AGN jet feedback are found in galaxy clusters, there is growing evidence that these jets are, in fact, largely ubiquitous. Indeed, AGN jets have now been detected in a wide variety of galaxy …
-
The Properties of AGN in the context of X-ray Binaries
Black holes are undoubtedly the most fascinating and exciting objects in the Universe, capturing the imagination of scientists and film writers alike. It has been a long standing objective of the scientific community to understand how these objects work and whether the black holes seen in the …
-
The high-redshift clusters occupied by bent radio AGN (COBRA) survey
… and high redshift are active galactic nuclei (AGNs). Specifically, bent, double-lobed radio sources are commonly found in clusters. I find high-redshift clusters hosting bent AGNs and explore their evolution and red sequence galaxies over cosmic time. To characterize cluster evolution, I …
-
The VIMOS-VLT Deep Survey: the evolution of type-1 AGN
Quasars and AGN play an important role in many aspects of the modern cosmology. Of particular interest is the issue of the interplay between AGN activity and formation and evolution of galaxies and structures. Studies on nearby galaxies revealed that most (and possibly all) galaxy nuclei contain a …
-
The AGN-host galaxy connection : new insights from the extended ionised gas
Active Galactic Nuclei (AGN) are powered by gas accretion onto supermassive Black Holes (BH). The luminosity of AGN can exceed the integrated luminosity of their host galaxies by orders of magnitude, which are then classified as Quasi-Stellar Objects (QSOs). Some mechanisms are needed to trigger …
-
Evaluating the Effectiveness of Supplemental Instruction on Generation Z Students in AGN 331
… Instruction (SI) on Generation Z students in AGN 331. The theory used as a model for this research was the Pace’s Model of College Impress. Prior research indicated that SI improves test scores, final grades, and persistence in historically difficult courses. Correlations and ANOVA’s were …
-
Space-Time Kinetics of the AGN-201M Research Reactor at the University of New Mexico
… experimental measurements were performed on the AGN- 201M reactor (AGN) at the University of New Mexico. Steady-state measurements were made with the AGN in various delayed critical configurations. These delayed critical configurations are defined by moving the coarse and fine control rods to …
-
Broad-band spectral analysis of a complete sample of type 1 AGN detected by INTEGRAL
… thesis is based on a complete sample of type 1 AGN extracted from the 3rd IBIS/ISGRI catalogue. Archival X-ray data taken from several observatories, such as XMM-Newton, Chandra, Swift/XRT and ASCA, have been combined together with IBIS spectra, providing for the first time a broad-band spectral …
-
The Impact of AGN Feedback on Galaxy Formation in Gas-Rich Mergers at z∼1-2
… effect of feedback from active galactic nuclei (AGNs). In total, 16 galaxy mergers at redshifts z = 1 and z = 2 were modeled using the simulation codes KETJU and GADGET-3. The simulations were performed on the supercomputer Mahti located at the Finnish IT Centre for Science (CSC). AGN feedback …
Page 1 of 6