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 31 for “"Galaxy Cluster"”.
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Cosmological signatures in galaxy cluster structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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The XMM-Newton/SDSS galaxy cluster survey
Galaxy clusters are the largest known gravitationally bound objects, their study is important for both an intrinsic understanding of their systems and an investigation of the large scale structure of the universe. The multi- component nature of galaxy clusters offers multiple observable signals …
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Early Type Galaxies And Reliable Galaxy Cluster Selection
In an era of precision cosmology, clusters of galaxies are the natural consequences under the hierarchical scenario, within which clusters directly encapsulate the history of structure formation. Thus, determining the mass distribution of clusters as a function of redshift enables fundamental tests …
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The galaxy cluster environments of wide angle tail radio sources
… onto the central black hole within an elliptical galaxy. Those which display a characteristic jet-hotspot-lobe transition and possess an intermediate radio power are called Wide Angle Tail radio sources (WATs). WATs are typically associated with the luminous central galaxy within a cluster of …
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Weak lensing flexion as a probe of galaxy cluster substructure
Measuring galaxy cluster total masses and the amount of dark matter substructure within galaxy cluster haloes is a fundamental probe of the ACDM model of structure formation, as well as the interactions between baryonic and non-baryonic matter. In this thesis I approach the topic of cluster mass …
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Cluster Weather Vanes: Radio Galaxies as Indicators of Galaxy Cluster Dynamics
… of such jets with dynamical features of galaxy cluster media such as winds and shock waves, and to use the recognizable observed features as diagnostic tools when examining real radio sources in clusters to better understand the state of the environment surrounding radio galaxies (RG). We …
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Probing distant clusters : a pre-SALT photometric study of intermediate redshift galaxy cluster
Includes bibliographical references (p. 273-279).
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Studying the environmental dependence of star formation properties of galaxies in the Abell 1437 galaxy cluster and its surrounding large scale structure
It has become clear that the local galaxy environment plays a crucial role in the evolution of galaxies. Recent studies show a strong bimodal distribution of galaxy properties, with red, passive galaxies dominating the bimodal distribution in dense environments, compared to blue, actively star …
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GALAXY-HALO CONNECTION AND CLUSTERING IN THE PRESENCE OF DYNAMICAL DARK ENERGY AND MASSIVE NEUTRINOS
… subhaloes and galaxies, and the analysis of the galaxy cluster mass function and clustering, in cosmologies alternative to the standard LCDM model. To this aim a large set of cosmological N-body simulations has been used, the so-called “Dark Energy and Massive Neutrino Universe” (DEMNUni) …
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STRONG GRAVITATIONAL LENSING MODELLING OF GALAXY CLUSTERS IN THE ERA OF BIG DATA
… the field of strong lensing (SL) by galaxy clusters. Remarkably, the Euclid Survey will cover approximately 15,000 square degrees of the sky, detecting SL features in thousands of massive clusters. Complementarily, the James Webb Space Telescope (JWST) is providing extremely deep and …
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Searching for Distant Galaxy Clusters : Optical Observations, Cluster Search Algorithms and the Cluster Selection Function
… to construct a statistically significant galaxy cluster sample for galaxy evolution studies using a multi-color classification scheme in the redshift range 0.5 < z < 1.5. After contributing to the survey specifications, tests of the multi-color classification with the observational setup …
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A Multiwavelength Analysis of the Effect of Cluster Environments on Galaxy Evolution
… to constrain the role of local environment on galaxy evolu- tion. The hot, dense galaxy cluster environment is utilized as a comparative laboratory to galaxies that reside in the less dense field where it is ‘alone’. Within clusters, the buildup of red, passive galaxies is observed to be in …
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Dust-Obscured Galaxy Protocluster and Cluster Survey (DOGPACS): Identifying Large-Scale Structures 9−10 Billion Light-Years Away
… and, eventually, large-scale structures, such as clusters of galaxies. Galaxy clusters are the most massive collapsed structures in the universe. During cluster formation, the largest aggregation of gas, galaxies, and dark matter passes through an intermediate phase called the protocluster. Over …
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Examining the growth and evolution of magnetic fields in clusters of galaxies: a numerical perspective
Magnetic fields are ubiquitous in galaxy cluster atmospheres and have a variety of astrophysical and cosmological consequences. Magnetic fields can contribute to the pressure support of clusters, affect thermal conduction, and modify the evolution of bubbles driven by active galactic nuclei. …
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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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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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Gravitationally lensed image simulations for the study of the substructure in galaxy clusters
… clean way to study the mass distribution of galaxy clusters. We are particularly interested in the substructure of dark matter in galaxy clusters as it signals constraints on various cosmological parameters as well as cluster evolution. Gravitationally lensed image simulations are needed in …
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Multifilter spectrophotometry of the environment of the quasar 3C281
… is applied to identify stars and deduce galaxy redshifts and morphological types in a field centred on the quasar 3C281, with the intention of both testing the method and identifying members of the galaxy cluster surrounding the QSO. Photometry is performed on CCD images taken in …
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Search for post-starburst (E+A) galaxies in the cluster Abell 3266
… the understanding of the dynamical state of the galaxy cluster Abell 3266. This is a very rich cluster in the southern skies that has been extensively studied by many groups. The cluster shows evidence of a merger of substructure in its midst, but the geometry, dynamics, and age of this merger …
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The Cluster and Large Scale Environments of Quasars at z < 0.9.
… into the environments of quasars with respect to galaxy clus- ters, and environment evolution with redshift and luminosity. The positions of quasars with respect to clusters have been studied using cluster and quasar catalogues available, covering the redshift range 0.2 < z < 1.2. The 2D projected …
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