Login | STScI Home | HubbleSite | Copyright, Content Use, and Policies
STScI Webcast

2017 Fall Science Colloquia

The Obscured Universe: From Peak Star-Formation to Reionization

Presented by: Caitlin Casey (University of Texas)
Category: Science Colloquia   Duration: 1 hour   Broadcast date: October 11, 2017
  • Bookmark/Share

Although rare in the nearby Universe, galaxies with extraordinary star-formation rates (100-1000x the Milky Way at >100 Msun/year) represent the typical massive galaxy in the early Universe ~10 billion years ago. These galaxies’ high star-formation rates are predominantly obscured by dust which re-radiates >95% of the energy from young stars in the (sub)millimeter/far-infrared, hence they are often called dusty star-forming galaxies (DSFGs). Thanks to facilities like the Herschel Space Observatory, we have successfully mapped the contribution of such DSFGs to cosmic star-formation from z~0 back to z~2, where it appears they are factors of 1000x more common than they are locally and indeed appear to dominate. I will discuss the next steps in mapping the obscured Universe beyond z~2 towards the Reionization Era, what the implications might be for surveys conducted in the near-IR by HST, JWST, and WFIRST, and how we can use dust and gas tracers in such extreme galaxies as novel constraints on the assembly history of large-scale structure.