Measurement of the Sunyaev-Zeldovich effect towards the A 2218 cluster of galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Compton Effect, Galactic Clusters, Microwave Emission, Relic Radiation, X Ray Sources, Astronomical Catalogs, Background Radiation, Doppler Effect, Radio Sources (Astronomy)

Scientific paper

Measurements of the degree of Comptonization of the cosmic microwave background radiation toward the cluster of galaxies A2218 have been carried out. Using available deep radio maps at several frequencies, scans and beam-switching techniques were chosen so as to avoid weak sources in the reference beams. A diminution of about 0.6 + or - 0.2 mK seems to have been detected, a level consistent with previous measurements.

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