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

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J.-P. Torre S. Church N. Coron J.-L. Puget J. J. Bock

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classification 🌌 astro-ph

keywords clusterfirstdovicheffectgalaxiespositivesubmillimetresunyaev-zel

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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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First measurement of the submillimetre Sunyaev-Zel'dovich effect

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