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Measurements of the Sunyaev-Zel'dovich Effect at 2.2 mm

Wilbanks, T. M., Ade, Peter A. R., Fischer, M. L., Ho, T. R., Holzapfel, W. L., Osgood, D. E. and Lang, A. E. 1993. Measurements of the Sunyaev-Zel'dovich Effect at 2.2 mm. Presented at: 181st AAS Meeting, Phoenix, AZ, 3-7 Jan 1993.

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We report a detection of the Sunyaev-Zel'dovich effect at mm wavelengths. A decrement in the brightness of the cosmic microwave background corresponding to Delta y=2.7 +/- 0.7 times 10(-4) has been observed at a wavelength of 2.2 mm in the direction of the x-ray bright Abell cluster 2163. The performance of the novel receiver used for this measurement and analysis of the confusion limits to measurements at these wavelengths indicate that the Sunyaev-Zel'dovich effect can be measured with precision in a large number of clusters. Measurements at mm wavelengths are expected to suffer from less source confusion than measurements at other wavelengths, and allow the thermal and kinetic Sunyaev-Zel'dovich effects to be distinguished from one another. Measurements at several mm wavelengths together with x-ray observations allow determination of the radial component of the peculiar velocity of the cluster. The measurement of the thermal Sunyaev-Zel'dovich effect in several clusters allows a determination of the Hubble expansion parameter which is independent of the usual cosmological distance scale.

Item Type: Conference or Workshop Item (Other)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Last Modified: 04 Jun 2017 08:15

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