The first billion years of history: star forming galaxies
in the early universe revealed with the Hubble Ultra Deep Field
Andrew Bunker
The availability of the Ultra Deep Field - the most
sensitive picture ever taken with the Hubble Space Telescope -
allows us to identify star forming galaxies within
the first billion years of the Universe (less than 10percent
the current age). This era is critical, as the gas between
the galaxies appears to undergo a phase change from mostly neutral
to mostly ionized. The main culprit for this is ultra-violet
photons from star formation - but do we see enough star
forming galaxies with Hubble to explain this?