Ultra Deep Field Science with WFIRST
Anton M. Koekemoer, R. J. Foley, David N. Spergel, Micaela B. Bagley, Rachel Bezanson, Federica Bianco, P. Capak, Gisella De Rosa, Mark Dickinson, Olivier Doré, Xiaohui Fan, Giovanni G. Fazio, H. C. Ferguson, A. V. Filippenko, Steven L. Finkelstein, Brenda Frye, Eric Gawiser, Norman A. Grogin, Nimish P. Hathi, Christopher M. Hirata · Bulletin of the American Astronomical Society · 2019
This whitepaper motivates an Ultra-Deep Field survey with WFIRST, covering at least ~100× the area of the HUDF, up to ~1 sq deg, to mag ~30, potentially revealing thousands of galaxies and AGN at the faint end of the LF, at or beyond z~10 in the epoch of reionization, and dramatically increasing the discovery potential at these redshifts.