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Sunyaev-Zeldovich effect

   Also found in: Acronyms, Wikipedia 0.03 sec.
Sunyaev-Zeldovich effect [su̇n¦yä‚ef zel′dō‚vich i‚fekt]
(astronomy)
A change in the spectrum of the cosmic background radiation in the direction of galaxy clusters, whereby the radiation is less intense at wavelengths longer than 1.4 millimeters and more intense at shorter wavelengths as the result of hot gas in the clusters.
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This is called the kinetic Sunyaev-Zeldovich effect, analogous to the familiar Doppler shift of sound waves, which explains why an ambulance's siren sounds different depending on whether the ambulance is approaching or moving away.
Galaxy clusters slide to the south: mysterious flow could call ... by Castelvecchi, Davide / Science News
It's this shift in photon energy, known as the Sunyaev-Zeldovich effect, that John E.
Dark doings: searching for signs of a force that may be everywhere ... by Cowen, Ron / Science News
 
 
 
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