Sunyaev-Zeldovich effect


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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.
References in periodicals archive ?
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.
In Thomson scattering, the scattered photon energy is left at the same level, and an increase of the scattered photon energy is obtained in the photon-particle interaction of the Sunyaev-Zeldovich effect.
It's this shift in photon energy, known as the Sunyaev-Zeldovich effect, that John E.