| Background Temp. Fluctuations |
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| • | Zeldovich
and Sunyaev in late 1960s: |
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| – | Compton
scattering by hot electrons in the IGM leads |
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a distortion of the background spectrum: |
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| “y” is Compton scattering optical depth and is |
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key parameter here. Note x = (hν/kT). |
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| COBE
limits from Page (1997). |