| Sunyaev-Zeldovich Effect |
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| • | Hot
gas can also be studied by looking for |
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| decrements
in the Cosmic Background |
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| radiation,
resulting from Compton scattering |
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| by
hot electrons. Net energy is
slightly |
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| increased. Not a symmetric effect – in |
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| Rayleigh-Jeans
region there is decrement but |
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| in
Wein region there is an excess. |
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| • | First
predicted by Sunyaev and Zeldovich in |
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| 1969,
and has been observed. |
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