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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). |
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