Wednesday, February 14, 2018
4:00 pm
Cahill, Hameetman Auditorium

Astronomy Colloquium

Early Galaxies and Cosmic Reionization: Progress & Challenges
Richard Ellis, University College London

The birth of galaxies represents the last unexplored frontier of cosmic history and it is commonly believedsuch early systems led to the transformation of neutral gas in the intergalactic medium into its presentfully-ionized state. Some progress has been made in charting the demographics of early galaxiesinto the era when reionization is thought to occur, but little is known about their nature of their stellar populations,
the possible role of active nuclei and whether galaxies are capable of generating sufficient ionizing radiation. Spectroscopy holds the key to addressing these questions, targeting both individual sources at high redshiftas well as carefully-chosen analogs at intermediate redshift. I will describe the recent progress and challengesas we anticipate the launch of JWST and the arrival of next-generation large telescopes.

Contact Althea E. Keith at 626-395-4973
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