Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt........35b&link_type=abstract
Ph.D dissertation, 2004. 141 pages; United States -- California: Stanford University; 2004. Publication Number: AAT 3145468. DA
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3
Spectral Measurements, Sunyaev-Zel'Dovich Effect, Cosmic Microwave Background, Galaxies
Scientific paper
This thesis describes spectral measurements of the Sunyaev-Zel'dovich (SZ) effect from clusters of galaxies using the Sunyaev-Zel'dovich Infrared Experiment (SuZIE II). SuZIE II is a 12 element 300 mK bolometer array which observes in three frequency bands between 150 and 350 GHz. Simultaneous multi- frequency measurements have been used to distinguish between thermal and kinematic components of the SZ effect, and to significantly reduce the effects of variations in atmospheric emission which can otherwise dominate the noise. We report significant detections of the SZ effect in 15 clusters of galaxies.
For a sub-sample of these clusters we have set limits to their peculiar velocities with respect to the Hubble flow, and have used the cluster sample to set a 95% confidence limit of <1260 km s -1 to the bulk flow of the intermediate-redshift universe in the direction of the CMB dipole. This is the first time that SZ measurements have been used to constrain bulk flows. We show that systematic uncertainties in peculiar velocity determinations from the SZ effect are likely to be dominated by sub-millimeter point sources and we discuss the level of this contamination.
We also calculate the central Comptonization, yo, the integrated SZ flux decrement, S, and the gas mass, M gas , of each cluster. We use these measurements to construct y 0 - T, S-T , and M gas - T scaling relations, where T is the X-ray temperature of the intra-cluster (IC) gas. The y 0 - T scaling relation is inconsistent with what we would expect for self-similar clusters; however this result is questionable because of a large systematic uncertainty in y 0 due to the spatial modelling of the IC gas. In general, this systematic uncertainty makes the y 0 - T relation difficult to measure. The S-T scaling relation has a slope and redshift evolution consistent with what we expect for self-similar clusters with a characteristic density that scales with the mean density of the universe. We rule out zero redshift evolution of the S- T relation at ~90% confidence. The M gas - T scaling relation is consistent with the expected self-similar relation and the corresponding relation calculated from X-ray observations. This marks the first time that the S-T and M gas - T scaling relations have been derived from SZ observations.
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