cosmology Flashcards

1
Q

reionization

A

when neutral hydrogen in the universe was ionized to HII/Hplus by the photons from the first stars and galaxies

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2
Q

recombination

A

before reionization, when protons and electrons combined into neutral hydrogen

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3
Q

time of reionization

A

150 million years after the Big Bang z=20
to
1 Gyr after the Big Bang z=6

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