----- Attempting Submission 1 (Thu May 10 19:26:25 GMT 2007) ----- The problem is about Center_Pattern = yes. We had made sure that this is what we want. The pattern is a 4-point (2x2) square dither pattern with a width of 4.1 arcsec. There are 4 such patterns, and their centers are offset from the nominal position by +/- 4.1 arcsec. In this way, the 4 patterns together will form a 16-point (4x4) pattern with a total size of 12.3 arcsec and with spacing between adjacent points of 4.1 arcsec. Assigned ID: 1484 ----- Attempting Submission 1 (Sat Feb 10 00:10:17 GMT 2007) ----- NICMOS Imaging of a z>4 High-Redshift Ultraluminous Submillimeter Source 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.
This observation is to obtain a deep 1.6 um integration on a faint, high-redshift galaxy in the HDF-N flanking field with 16 orbits. Because the 1.6 um background in the HDF-N is low, each exposure is set to be as long as the visibility period in an orbit, to minimize the contribution of read noise. Therefore there will be only 16 exposures. The 16 exposures are dithered with 4.1 arcsec spacing, forming a square 4x4 pattern with a total width of 12.3 arcsec. The 16 orbits are divided into 4 visits; each visit contains 4 orbits. As recommended by a NICMOS Instrument Scientist (Nor Pirzkal), we request SAA-free orbits to avoid SAA-persistence noise hit. 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