Characterizing the Sources Responsible for Cosmic Reionization

Details Characterizing the Sources Responsible for Cosmic Reionization Characterizing the Sources Responsible for Cosmic Reionization

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10159e&link_type=abstract

HST Proposal ID #10159

Physics

Hst Proposal Id #10159 Cosmology

Scientific paper

Our group has demonstrated the role that massive clusters of galaxies, acting as powerful cosmic lenses, can play in locating sources with modest mass and star formation rate beyond redshifts z 5-6 likely to be representative of those responsible for cosmic reionization. The large magnifications, possible in the critical regions of well-constrained clusters, bring sources into view that would lie at or beyond the limits of conventional exposures such as the UDF. Recently, using deep ACS and NICMOS imaging, we have located a low mass source at z=7.05 whose UV continuum slope is apparently steeper than for normal star-forming galaxies. We propose a deep ACS grism exposure to confirm the nature of this source and further ACS and NICMOS imaging of well-studied clusters to locate further examples. The grism spectroscopy will conclusively determine the UV SED of this source and our 3-color survey will constrain the redshift, star-formation rate, and SED of additional 66.5, with more than 2.5 Msun/yr of star formation {our survey limit}. Before the advent of the next generation of observational facilities, our search technique may represent the only way to reliably select and characterize the likely population of galaxies during the epoch of reionization.

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