Other
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11191w&link_type=abstract
HST Proposal ID #11191. Cycle 16
Other
Scientific paper
We propose 16 orbits of deep NICMOS 1.6 um imaging of GOODS850-5, a unique z>4 candidate SCUBA source that is bright in the submillimeter submm but extremely faint at all other wavelengths. GOODS850-5 is a 11 mJy 850 um source discovered in our GOODS-N SCUBA survey. It does not have a radio counterpart and its accurate location was recently determined with the SMA interferometer. It is not detected by the GOODS-N HST ACS imaging and is just above the detection limit of the ultradeep Spitzer imaging at 3.6-24 um. Its faint radio flux and its Spitzer color suggest a redshift of z>4, and potentially even z>6. It has an incredible star formation rate of ~1000 solar mass per year, and it can quickly grow into a >10^11 solar mass massive galaxy. Radio faint submm sources like GOODS850-5 may be a new population of high-redshift massive galaxies that are not picked up by any of the previous optical, near-IR, and radio surveys, and therefore it is crucial to obtain the redshift of GOODS850-5. However, because of its extreme optical faintness, the only way to constrain its redshift is photometric redshift with the existing Spitzer photometry and the proposed NICMOS 1.6 um photometry. NICMOS is the only instrument that can provide information about its redshift and morphology among all space-based and ground-based instruments at all wavelengths. The proposed observation will provide unique insight on galaxy evolution and mass assembly at high redshift.;
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