| Important
Epochs, Detail |
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| • | Epoch of
Recombination: |
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| – | Redshift
about z=1500 radiation temperature |
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| was some 4000
K, and enough ionizing |
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| photons (just
in the Wien region of the |
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| spectrum, but
enough since many more |
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| photons than
baryons) to keep hydrogen |
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| ionized. See text calculation, or do it |
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| yourself. |
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| – | Epoch of
recombination defined to be |
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| redshift for
which 50% of the H is ionized. |
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