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 85 for “"Galaxy clusters"”.
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Black Holes, Galaxy Clusters and Gravitational Waves
… Studying two-body mergers of realistic galaxy clusters, we show that these reproduce the observed metallicity distribution in the Intra Cluster Medium (ICM). We characterise entropy generation and mixing induced by the merger process.
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Exploring Galaxy Clusters and Groups with Cosmological Simulations
Galaxy clusters are the largest gravitationally-bound objects in the Universe, their unparalleled size providing powerful leverage to probe large-scale structure growth and cosmology. At the same time, clusters and groups of galaxies represent unique astrophysical playgrounds in which galaxies …
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X-ray Spectroscopy of Cool Core Galaxy Clusters
… my PhD research on the cooling flow problem in galaxy clusters. The centre of relaxed galaxy clusters has a short radiative cooling time suggesting the presence of a massive cooling flow. However, early studies using high resolution X-ray spectroscopy indicated much lower levels of cooling rate. …
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The structure of elliptical galaxies and galaxy clusters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Galaxy clusters as astrophysical laboratories and probes of cosmology
Galaxy clusters are the most recent of cosmological structures to have formed by the present time in the currently favoured hierarchical scenario of structure formation and are widely regarded as powerful probes of cosmology and galaxy formation physics alike. Over the past few years, it became …
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Infrared-Bright Active Galactic Nuclei in Massive Galaxy Clusters
The number of active galactic nuclei (AGN) in galaxy clusters has been observed to grow by nearly two orders of magnitude from the local universe to z ~ 1.5. Star formation rates in clusters have also been observed to rise rapidly over this redshift interval. These trends, along with several other …
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Investigating the AMI SZ Selection Function of Galaxy Clusters
… studies the Sunyaev- Zel’dovich (SZ) effect of galaxy clusters by using the Large and Small Arrays (LA & SA) in essentially simultaneously observations. The analysis uses a spherically- symmetric Navarro, Frenk and White (NFW) model for non-baryonic matter and a generalised (GNFW) model for gas …
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Morphological classification and dynamics of X-ray galaxy clusters
Includes bibliographical references.
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Evolution of Supermassive Black Hole Feedback in Galaxy Clusters
Galaxy clusters, the largest gravitationally-bound structures in the Universe, are superb laboratories for studying the baryon cycle that governs the evolution of all galaxies. The outer boundary of a galaxy’s circumgalactic medium (CGM) should be the most sensitive probe of inflowing and …
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Evolution of X-ray and optical properties of galaxy clusters
… X-ray and optical studies of 27 X-ray selected galaxy clusters from the XMM-LSS survey. These systems are mostly groups and poor clusters, with temperatures 0.6-4.8 keV, spanning the redshift range 0.05 to 1.05, hence these are some of the highest redshift X-ray selected clusters to have been …
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Bayesian Modelling of Galaxy Clusters with the Arcminute Microkelvin Imager
… near Cambridge. It was designed to observe galaxy clusters using the Sunyaev Zel’dovich (SZ) effect. The SA is used to observe secondary SZ anisotropies in the Cosmic Microwave Background (CMB), whilst the longer baselines of the LA make it suitable for the detection of contaminating …
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Physical modelling of galaxy clusters and Bayesian inference in astrophysics
This thesis is concerned with the modelling of galaxy clusters, applying these models to real and simulated data using Bayesian inference, and the development of Bayesian inference algorithms applicable to a wide range of astrophysical problems. I present a comparison of mass estimates for $54$ …
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Deep NIR imaging of galaxy clusters in the Vela supercluster
Gravitational forces of large galaxy over densities can perturb the smooth motions expected from the expanding universe, causing peculiar motions. The observed Cosmic Microwave Background (CMB) dipole is the result of the Local Group's peculiar motion, the direction and amplitude of which are still …
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The type IA supernova rate in intermediate redshift galaxy clusters
Studies of Type Ia supernovae (SNe Ia) in galaxy clusters can tell us about the metal enrichment of the intra-cluster medium, constrain the star formation history of cluster galaxies, aid us in the investigations of the progenitor systems of SNe Ia, act as tracers of the intra-cluster stellar …
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The search for dark matter annihilation in galaxy clusters at VERITAS
… been proposed to search for the elusive WIMP. Galaxy clusters, consisting of hundreds to thousands of galaxies, are the largest collections of matter in the Universe held together by gravity. As such, galaxy clusters also contain the highest concentrations of DM found anywhere.</p> <p>This …
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Cosmology from galaxy clusters with cosmic microwave background lensing mass calibration
… we present a cosmological analysis of the galaxy clusters in the Planck MMF3 cosmology sample, which consists of 439 Sunyaev-Zel’dovich-detected clusters, with a cosmic microwave background (CMB) lensing calibration of the cluster masses. As demonstrated by Planck, galaxy clusters detected …
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Multicolor analysis of galaxy clusters with radio halos and/or relics
Galaxy clusters can be sites of considerable dynamic activity due to intra-cluster and inter-cluster interactions. These interactions include cluster-cluster mergers which are accompanied by large release of energy observed via thermal X-ray emission. The work presented here focuses on clusters …
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Probing the history of galaxy clusters with metallicity and entropy measurements
Galaxy clusters are the largest gravitationally bound objects found today in our Universe. The gas they contain, the intra-cluster medium (ICM), is heated to temperatures in the approximate range of 1 to 10 keV, and thus emits X-ray radiation. Studying the ICM through the spatial and spectral …
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A New Mass Measurement for Galaxy Clusters Using Position and Radial Velocity
<p>Galaxy clusters are the largest structures in the Universe, and the evolution ofgalaxy cluster mass profiles is a useful tool for constraining cosmological models. Mostmethods established for obtaining a mass profile of a cluster of galaxies assumes theclusters obey the virial theorem; however, …
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