Mathematics – Logic
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........7h&link_type=abstract
Ph.D dissertation, 2005. Section 0051, Part 0606 171 pages; United States -- Colorado: University of Colorado at Boulder; 2005.
Mathematics
Logic
1
High-Redshift, X-Ray, Multiwavelength, Cluster
Scientific paper
The characterization of clusters of galaxies at high redshift provides an important contribution to constraints on cosmological models. In particular, reliable mass estimations of cluster samples over a broad range in redshift supply essential information on the evolution of the cluster mass function, and place critical constraints on cosmological parameters (O m , s 8 , and w ). This thesis provides the first in depth analysis of Chandra X-ray observations of high redshift (0.6 < z < 1.1) optically selected clusters of galaxies from the Red-sequence Cluster Survey (RCS).
In the first chapter we present a detailed Chandra analysis of the Canadian Network for Observational Cosmology (CNOC) cluster sample. These are moderate redshift (0.17 < z < 0.55) X-ray selected clusters, and their analysis sets the stage for comparisons between optical and X-ray selection, investigations of cluster redshift evolution, and initial calibrations of optical richness as a predictor of global cluster properties. We also confirm the reliability of X- ray mass determinations by direct comparison to alternate methods.
Following chapters supply a thorough X-ray investigation of the properties of RCS clusters, high z mass comparisons, and the characterization of optical richness as a mass estimator at high redshift. Chandra observations of RCS clusters are presented in Chapter 3. The next chapter details a comprehensive Chandra analysis of the lensing cluster RCS0224-0002. Chapter 5 presents comparisons of independent mass estimations for RCS clusters from optical richness, Sunyaev Zeldovich (SZ) observations, and X-ray analysis.
The major findings of this work are numerous and varied, but our most significant results can be summarized as follows. High redshift optically selected clusters exhibit smaller gas mass fractions than their lower redshift X-ray selected counterparts, due to high entropy of their gaseous components. RCS clusters exhibit a wide array of dynamical states, from highly relaxed to formative. The propensity for the RCS survey to detect closely spaced structures along the line of sight is partially responsible for the high incidence of strong gravitational lensing found in this sample. Finally, SZ and optical richness mass estimation techniques are faced with significant challenges at high redshift, however both methods are highly promising should redshift calibrations be effectively implemented.
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