Wednesday, May 22, 2013
4:00 pm
Cahill, Hameetman Auditorium

Astronomy Colloquium

CSI-Los Angeles: The Growth of Distant Galaxies and Reionization
Ranga- Ram Chary, Caltech

The discovery of an unusual population of galaxies with extremely strong nebular line emission has come as a panacea to several problems in galaxy evolution. These objects, classified as Halpha emitters, were first detected in the z>5 Universe in deep Spitzer imaging, where they dominate the spectroscopically confirmed star-forming galaxy population. Since then, they have been re-discovered in the local Universe in the Sloan   
Digital Sky Survey where they constitute 0.04% of the spectroscopic sample, and at intermediate redshift using Hubble/WFC3 grism surveys. Their ubiquity in the distant Universe and the unusual properties of their stellar population make them strong candidates for being progenitors of massive galaxies at z~2 and for being the primary sources responsible for reionization. I will present our work in identifying these galaxies, insights
into the mechanism for fueling star-formation in these objects and their role in reionization. The merits of using multiwavelength observations in obtaining an improved understanding of high redshift galaxy populations will in particular be highlighted.

Contact Althea E. Keith aek@astro.caltech.edu at 626-395-4973
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