RSAA Colloquia / Seminars / Feast-of-Facts: Thursday, 27 November 2014, 11:00-12:00; Duffield Lecture Theatre

Andrew Bunker

"Finding Distant Galaxies and Determining the Star Formation History of the Universe"

I will discuss how Hubble Space Telescope images of deep fields, coupled with wider-field surveys, have discovered star-forming galaxies out to very high redshifts, close to the epoch that the intergalactic medium reionizes (at z>6). From their rest-frame UV emission we can estimate individual star formation rates, and study evolution of the star formation rate density with cosmic time. At lower redshifts, near-infrared spectroscopy (including slitless spectroscopy with WFC3 on HST) has enabled us to measure star formation rates at redshifts beyond one through the redshifted rest-frame optical lines. I will review current work on this, and look to future developments (in particular JWST).