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 19 of 19 for “"Massive black holes"”.
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Dense stellar systems and massive black holes
… of the cardinal predictions of this theory are black holes. Massive, dark objects are found in the majority of galaxies. Our own galactic center very contains such an object with a mass of about four million solar masses. Are these objects supermassive black holes (SMBHs), or do we need …
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Star Clusters and Dark Matter as Probes of the Spacetime Geometry of Massive Black Holes
… class of stars orbiting very close to the supermassive black hole at the center of our galaxy, known as Sgr A*, could provide tests of the so-called no-hair theorem of general relativity through the measurement of precessions of their orbital planes. By considering how a distribution of stars …
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The Disruption of Binary Star Systems by Massive Black Holes and the Restricted 3-Body Problem
… when a binary star system orbits close to a massive compact object, such as a massive black hole. When this occurs the binary members are separated and one of the binary members gains the orbital energy of its partner, ejecting it at high speeds leaving the partner bound to the black hole. …
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X-Ray studies of the physics of matter around super-massive black-holes in nearby Seyfert galaxies
… investigate the flow patterns close to super-massive black-holes, three case study objects for which enough counts statistics is available have been analysed using deep X-ray observations taken with XMM–Newton. The obtained results have shown that the accretion flow can significantly differ …
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Heart of darkness
A few decades ago, black holes were a theoretical quirk. Highly probable on paper, they were doubted more than touted; many scientists didn't believe they even existed. Today, however, black holes appear to be everywhere, from behemoths in the cores of almost every galaxy to more modest, …
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Dynamics of dense gas-star systems : Black holes and their precursors
… between the stellar system and the central black hole give rise to a lot of interesting phenomena. The scheme we employ enables a study of clean-cut aspects without any noise that particle methods suffer from. We study the most important physical processes that are readily available in the …
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Black Holes, Galaxy Clusters and Gravitational Waves
… Relativity predictions to the ones from a Massive Graviton theory. We can discriminate between the two theories and produce posterior probability distribution functions. We also devise a method to combine multiple observations that y increases the amount of information that is possible to …
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Numerical Simulations of Galaxy Formation During the Epoch of Reionization
… two main sections: 1) The formation of the first massive black holes and 2) Interpreting ALMA observations of galaxy formation during the epoch of reionization. The first topic addresses the existence of super massive black holes (SMBHs) with $M_{\rm BH}>10^9$M$_{\odot}$ at $z>6$. It is well …
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The nucleus of Centaurus A
… Mpc away, Centaurus A (NGC 5128) is the nearest massive elliptical galaxy, the nearest radio galaxy, and the nearest recent merger. It is the ideal laboratory to study the connection between merging, massive black holes, the source of radio jets, and merger-induced star formation in detail. Using …
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Observable signatures of general relativistic dynamics in compact binaries
… binary systems. The first is the coalescence of massive black holes in high-redshift galaxies. The gravitational waves (GWs) from these systems can be detected by the proposed low-frequency gravitational wave detector LISA and used to determine the various parameters which characterize the …
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On the Distances and Energetics of AGN 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 energetics. The majority of the work presented in this thesis involved photoionization modeling of AGN …
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Mergers of Supermassive Black Hole Binaries in Gas-rich Environments: Models of Event Rates and Electromagnetic Signatures
Supermassive black holes permeate the observable Universe, residing in the nuclei of all or nearly all nearby massive galaxies and powering luminous quasars as far as ten billion light years away. These monstrous objects must grow through a combination of gas accretion and mergers of less massive …
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Exploring gravity
… systems where a small body orbits a much more massive one. EMR bursts, a particular class of GW signals, could be used to determine the properties of massive black holes (MBHs). They could be detectable with a space-borne interferometer from many nearby galaxies, as well as the Galactic centre. …
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Monitoring Broad Absorption-Line Quasar Variability
Winds generated by an accreting super massive black hole may provide feedback to the host galaxy and offer an explanation for the co-evolution of galaxies with their super massive black holes that has been reported in the literature. Some outflows are manifested as broad absorption line (BAL) …
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Outflow properties of luminous quasars
Quasars, powered by accretion onto the super-massive black holes at their galaxies' centres, are capable of ejecting highly energetic outflows of gas, which can suppress star formation in the host galaxy, thereby impacting its evolution. Quasar-driven outflows are widely invoked in galaxy formation …
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Simulations of active galactic nucleus feedback in the cores of galaxy clusters
… feedback from AGN that consist of central super-massive black holes (SMBH) in galaxy clusters through simulations is a very challenging problem. Due to limited resolution to resolve physics at sub-resolution scales, previous studies usually involve a subgrid model and considerable simplification …
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Crowded field spectroscopy and the search for intermediate-mass black holes in globular clusters
Globular clusters are dense and massive star clusters that are an integral part of any major galaxy. Careful studies of their stars, a single cluster may contain several millions of them, have revealed that the ages of many globular clusters are comparable to the age of the Universe. These …
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Demographics of supermassive black holes
Supermassive black holes are a fundamental component of the universe in general and of galaxies in particular. Almost every massive galaxy harbours a supermassive black hole (SMBH) in its center. Furthermore, there is a close connection between the growth of the SMBH and the evolution of its host …
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The VIMOS-VLT Deep Survey: the evolution of type-1 AGN
… (and possibly all) galaxy nuclei contain a super-massive black hole (SMBH) and that between a third and half of them are showing some evidence of activity (Kormendy and Richstone, 1995). The discovery of a tight relation between black holes mass and velocity dispersion of their host galaxy …