James E. Rhoads, Sangeeta Malhotra, Daniel Stern, Mark Dickinson, Norbert Pirzkal, Hyron Spinrad, Naveen Reddy, Arjun Dey, Nimish Hathi, Norman Grogin, Anton Koekemoer, Michael A. Peth, Seth Cohen, Tamas Budavari, Ignacio Ferreras, Jonathan Gardner, Caryl Gronwall, Zoltan Haiman, Gerhardt Meurer, Leonidas Moustakas, Nino Panagia, Anna Pasquali, Kailash Sahu, Sperello di Serego Alighieri, Amber Straughn, Jeremy Walsh, Rachel Somerville, Rogier Windhorst, Chun Xu, Haojing Yan
Slitless grism spectroscopy from space offers dramatic advantages for studying high redshift galaxies: high spatial resolution to match the compact sizes of the targets, a dark and uniform sky background, and simultaneous observation over fields ranging from five square arcminutes (HST) to over 1000 square arcminutes (Euclid). Here we present observations of a galaxy at $z=6.57$ --- the end of the reioinization epoch --- identified using slitless HST grism spectra from the PEARS survey (Probing Evolution And Reionization Spectroscopically) and reconfirmed with Keck + DEIMOS. This high redshift identification is enabled by the depth of the PEARS survey. Substantially higher redshifts are precluded for PEARS data by the declining sensitivity of the ACS grism at lambda > 0.95 micron. Spectra of Lyman breaks at yet higher redshifts will be possible using comparably deep observations with IR-sensitive grisms.
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http://arxiv.org/abs/1302.7005
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