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
2
Q
recombination
A
before reionization, when protons and electrons combined into neutral hydrogen
3
Q
time of reionization
A
150 million years after the Big Bang z=20
to
1 Gyr after the Big Bang z=6