![](v3_space.gif) |
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![](v3_space.gif) |
![](v3_space.gif) |
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Background Temp. Fluctuations
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![](v3_space.gif) |
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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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to
a distortion of the background spectrum:
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![](v3_slide0479_image016.jpg) |
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![](v3_space.gif) |
![](v3_space.gif) |
“y” is Compton scattering optical depth and is
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the
key parameter here. Note x = (hν/kT).
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![](v3_slide0479_image017.jpg) |
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![](v3_master03_image018.gif) |
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COBE
limits from Page (1997).
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