Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7499m&link_type=abstract
HST Proposal ID #7499
Physics
Hst Proposal Id #7499 Cosmology
Scientific paper
We propose a parallel program using NICMOS's unique capabilities for slitless spectroscopy in the near IR. We will observe with the G096 & G141 grisms whenever there is a parallel opportunity of 1 orbit or more. After a proprietary period of 60 days the data will be made available to the community at large. The proposed program will allow us to search for very high redshift emission-line objects, to measure the evolution of field galaxies to z~ 4, and to measure the space density of low luminosity AGNs. Using the pointing distribution derived from previous HST usage as a guide, we expect to cover 0.4 square degrees in one cycle of 3000 parallel orbits. Our ultimate goal is to cover between 3/4 to 1 square degree over two or more cycles. One cycle of 3000 orbits will produce continuum detections of ~ 35,000 galaxies to a typical level of H ~ 20 with S/N = 4. We will determine the global star formation rate in the redshift range 0.3 - 1.9 directly from HAlpha emission and from OII3727 to z ~ 4 over a volume of ~ 10^7 Mpc^3. We will carry out a search for primeval galaxies through redshifted HAlpha, OII3727, and LyAlpha emission lines with a sensitivity that is equal to or better than that of any ground-based survey, while probing a unique and unprecedentedly large range of wavelengths and redshifts. The direct images that are required to calibrate the grism data will produce a catalog of ~ 42,000 galaxy images.
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