Are Low-Luminosity Galaxies Responsible for Cosmic Reionization?

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Scientific paper

Our group has demonstrated that massive clusters, acting as powerful cosmic lenses, can constrain the abundance and properties of low-luminosity star-forming sources beyond z 6; such sources are thought to be responsible for ending cosmic reionization. The large magnification possible in the critical regions of well-constrained clusters brings sources into view that lie at or beyond the limits of conventional exposures such as the UDF. We have shown that the combination of HST and Spitzer is particularly effective in delivering the physical properties of these distant sources, constraining their mass, age and past star formation history. Indirectly, we therefore gain a valuable glimpse to yet earlier epochs. Recognizing the result {and limitations} of blank field surveys, we propose a systematic search through 10 lensing clusters with ACS/F814W and WFC3/[F110W+F160W] {in conjunction with existing deep IRAC data}. Our goal is to measure with great accuracy the luminosity function at z 7 over a range of at least 3 magnitude, based on the identification of about 50 lensed galaxies at 6.5

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