Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..247l&link_type=abstract
Spitzer Proposal ID #247
Physics
Scientific paper
The ionizing radiation produced by the known population of z~6-7 galaxies falls short of that required to reionize the Universe by a factor ~5. Quasars in this redshift range show Gunn-Peterson troughs, however, indicating that a significant fraction of the intergalactic medium is neutral at these redshifts, and that reionization probably occurred just before this epoch. This implies a large population of starbursting galaxies at z~7-12. In this DDT program we will test the feasibility of using the SL module of IRS to detect Halpha emission from this population. To boost our sensitivity, we will use the lensing effect of the cluster A2218. We request 24hr of observing time to take a single, deep integration at a position corresponding to magnification >10 by the cluster. If our observations reach the required sensitivity we will apply for a full survey using ~8 slit positions in GO3. Even this single observation will place unique constraints on the nature of the reionizing population which will not be rivalled until the advent of JWST.
Bunker Andy
Kneib Jean Paul
Lacy Mark
Teplitz Harry
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