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H_o from Cosmic Background Imager observations of the Sunyaev-Zeldovich effect in nearby clusters

Citation

Udomprasert, Patricia Simcoe (2004) H_o from Cosmic Background Imager observations of the Sunyaev-Zeldovich effect in nearby clusters. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05132004-184937

Abstract

We present Ho results from Cosmic Background Imager (CBI) observations of the Sunyaev-Zeldovich Effect (SZE) in 7 galaxy clusters, A85, A399, A401, A478, A754, A1651, and A2597. These observations are part of a program to study a complete, volume-limited sample of low-redshift (z < 0.1), X-ray selected clusters. Our focus on nearby objects allows us to study a well-defined, orientation unbiased sample, minimizing systematic errors due to cluster asphericity. We use density models derived from ROSAT imaging data and temperature measurements from ASCA and BeppoSAX spectral observations. We quantify in detail sources of error in our derivation of Ho, including calibration of the CBI data, density and temperature models from the X-ray data, Cosmic Microwave Background (CMB) primary anisotropy fluctuations, and residuals from radio point source subtraction. From these 7 clusters we obtain a result of Ho = 67^{+30}_{-18}_{(ran)}^{+15}_{-6}_{(sys)} km/s/Mpc for an unweighted sample average. The respective quoted errors are random and systematic uncertainties at 68% confidence. The dominant source of error is confusion from intrinsic anisotropy fluctuations. We present results from simulations of an eigenmode weighting analysis that reduce the uncertainties due to CMB in h^{-1/2} by ~30%.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:cosmology; galaxy clusters
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Astronomy
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Readhead, Anthony C. S.
Thesis Committee:
  • Lange, Andrew E. (chair)
  • Blain, Andrew W.
  • Djorgovski, George
  • Phinney, E. Sterl
  • Readhead, Anthony C. S.
Defense Date:12 August 2003
Author Email:psu (AT) astro.caltech.edu
Record Number:CaltechETD:etd-05132004-184937
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-05132004-184937
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1771
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:28 May 2004
Last Modified:26 Dec 2012 02:41

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