The 7-Element AMiBA and caling Relations of Galaxy Clusters erived from AMiBA Observations
Date Issued
2009
Date
2009
Author(s)
Huang, Chih-Wei Locutus
Abstract
The Y.T. Lee Array for Microwave Background Anisotropy (AMiBA) is an experiment dedicated to observe the secondary signals in the cosmic microwave background (CMB), including the Sunyaev-Zel''dovich Effect (SZE). The redshift independence of the SZE enables the direct detection of distant galaxy clusters which are effective cosmological probes to the evolution of structure formation. In this dissertation we discuss how we calibrated and solved several key issues during the operation of 7-element AMiBA. We also present the science results of the first-year observation, in which we mainly focus on the scaling relations of galaxy clusters.MiBA is a coplanar interferometer whose first commissioned phase consisted of seven 0.6-m antennas in a hexagonal close-packed configuration, with receivers operating at 94 GHz. It has a hexapod mount and thus an unique pointing model. We conducted the detailed testing and calibration on the site, including the measurement of pointing errors, the beam pattern of reflectors, the system temperature and efficiency, the radio alignment of antennas, and the ground pick-up. All systematics are controlled within acceptable accuracy. Observation strategies and data processing are also discussed.uring 2007 six massive Abell clusters were observed and their SZEs were detected. We investigated the scaling relations of these clusters, relating the integrated Compton-$y$ parameter $Y_{2500}$ to X-ray derived gas temperature $T_{mathrm{e}}$, total mass $M_{2500}$, and bolometric luminosity $L_{mathrm{X}}$. Our results for the power-law index and normalization are both consistent with the self-similar model and other studies in literature except for the $Y_{2500}$--$L_{mathrm{X}}$ relation, for which physical explanation given though further investigation may be still needed. Our results provide not only confidence for AMiBA project but also supports to our understanding of galaxy clusters.
Subjects
AMiBA
cosmic microwave background
cosmology
galaxy clusters
scaling relations
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