Abstract
An unequivocal detection of the Sunyaev–Zeldovich effect1, the cooling of the brightness temperature of the microwave background radiation towards the atmospheres of clusters of galaxies, has profound cosmological significance2–6, but has hitherto proved elusive. We present here measurements of the effect towards three rich clusters of galaxies made with the 40-m telescope of the Owens Valley Radio Observatory at 20.3 GHz. These results are three times more sensitive than other results previously reported7–9, are free from systematic errors at the 100 µK level, and provide very strong evidence for the reality of the Sunyaev–Zeldovich effect.
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Birkinshaw, M., Gull, S. & Hardebeck, H. The Sunyaev–Zeldovich effect towards three clusters of galaxies. Nature 309, 34–35 (1984). https://doi.org/10.1038/309034a0
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DOI: https://doi.org/10.1038/309034a0
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