First measurement of the submillimetre Sunyaev-Zel'dovich effect
J. -M. Lamarre, M. Giard, E. Pointecouteau, J. -P. Bernard, G. Serra, F. Pajot, F. -X. Desert, I. Ristorcelli, J. -P. Torre, S. Church, N. Coron, J. -L. Puget, J. J. Bock
Abstract
We report the first detection of the Sunyaev-Zel'dovich increment on the cosmic microwave background (CMB) at submillimetre wavelengths in the direction of a cluster of galaxies.It was achieved towards the rich cluster Abell 2163, using the PRONAOS 2-metre stratospheric telescope. Together with data from the SuZIE, Diabolo, and ISO-PHT experiments, these measurements, for the first time, give a complete picture of the far-infrared to millimetre spectral energy distribution of the diffuse emission toward a cluster of galaxies. It clearly shows the positive and negative parts of the S.Z. effect and also a positive signal at short wavelengths that can be attributed to foreground dust in our galaxy.
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