Richard Ellis, Caltech, "Studies of Star-Forming Galaxies in the Reionization Era"
Astronomy colloquium: March 11, 2015 @ 3PM
Deep exposures with the Hubble Space Telescope (HST) have provided the primary evidence that star-forming galaxies were present in the first billion years of cosmic history. Sometime during this early period the intergalactic medium transitioned from a neutral gas to one that is fully ionized.