AAS 201st Meeting, January, 2003
Session 23. Cosmology: The Fundamental Parameter
Oral, Monday, January 6, 2003, 10:00-11:30am, 608-609

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[23.02D] Measuring H0 through observations of the Sunyaev-Zeldovich Effect in Nearby Clusters with the Cosmic Background Imager

P.S. Udomprasert, B.S. Mason, A.C.S. Readhead (Caltech)

We present results from the Cosmic Background Imager's program to measure H0 with 10% accuracy through observations of the Sunyaev-Zeldovich Effect in a complete sample of nearby (z<0.1) clusters. We describe our sample selection and discuss the advantages and disadvantages of studying low-z clusters over those at higher z. The results we present here utilize density models and isothermal temperatures from ROSAT, ASCA, and BeppoSAX observations. We discuss possible errors from assuming isothermal cluster gas, and we show how accurate temperature profiles from current X-ray missions can improve the H0 measurements. We also quantify other sources of error such as observational noise, CMB primary anisotropy fluctuations, radio point sources, and cluster asphericity.

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© 2002. The American Astronomical Soceity.