"Measuring and Modeling the Universe", from the Carnegie Observatories Centennial Symposia. Published by Cambridge University Press, as part of the Carnegie Observatories Astrophysics Series. Edited by W. L. Freedman, 2004, p. 138.

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MEASURING THE HUBBLE CONSTANT WITH THE SUNYAEV-ZEL'DOVICH EFFECT

Erik D. Reese


The University of California, Berkeley


Abstract. Combined with X-ray imaging and spectral data, observations of the Sunyaev-Zel'dovich effect (SZE) can be used to determine direct distances to galaxy clusters. These distances are independent of the extragalactic distance ladder and do not rely on clusters being standard candles or rulers. Observations of the SZE have progressed from upper limits to high signal-to-noise ratio detections and imaging of the SZE. SZE/X-ray determined distances to galaxy clusters are beginning to trace out the theoretical angular-diameter distance relation. The current ensemble of 41 SZE/X-ray distances to galaxy clusters imply a Hubble constant of H0 approx 61 ± 3 ± 18 km s-1 Mpc-1, where the uncertainties are statistical followed by systematic at 68% confidence. With a sample of high-redshift galaxy clusters, SZE/X-ray distances can be used to measure the geometry of the Universe.


Table of Contents

INTRODUCTION

THE SUNYAEV-ZEL'DOVICH EFFECT
Thermal Sunyaev-Zel'dovich Effect
Kinetic Sunyaev-Zel'dovich Effect

MEASUREMENTS OF THE SZE
Sources of Astronomical Contamination and Confusion
Single-dish Observations
Interferometric Observations

THE COSMIC DISTANCE SCALE FROM SZE/X-RAY DISTANCES
Current Status of SZE/X-ray Distances
Sources of Possible Systematic Uncertainty
Future of SZE/X-ray Distances

SZE SURVEYS

SUMMARY

REFERENCES

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