The Grism-ACS Program for Extragalactic Science {GRAPES}

Details The Grism-ACS Program for Extragalactic Science {GRAPES} The Grism-ACS Program for Extragalactic Science {GRAPES}

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9793m&link_type=abstract

HST Proposal ID #9793

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #9793 Cosmology

Scientific paper

We propose an ACS grism spectroscopic survey with a wide component and an ultradeep single ACS field. The wide component covers the well-imaged GOODS Chandra Deep Field south and the deepest field will be the Ultra Deep field to be observed in cycles 11 and 12. The Grism ACS Program for Extra-galactic Science {GRAPES} will: {1} Probe the reionization epoch by robustly determining the luminosity function of Lyman-alpha emitters, Lyman break galaxies and low luminosity AGNs at z 6, and thus the sources of ionizing photons at the end of the "dark ages". A similar census of ionizing photon sources at z=4-6 needed to maintain the ionized state of the IGM will also be achieved. {2} Study galaxy formation and evolution by finding galaxies in a contiguous redshift range between z=4-7 and evolution of black holes through a census of low-luminosity AGNs. {3} Study star-formation and galaxy assembly at its peak at z=1-2 by identifying star-forming galaxies by their emission lines, old galaxies by the 4000 AA break and any combination of new and old populations showing both lines and breaks. {4} Allow the deepest unbiased spectroscopy yet, for identification of objects to I=27. {5} Enhance the value of multiwavelength data in the UDF and GOODS field to the astronomical community.

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