NICMOS Parallel Imaging campaigns covered enough sky (250 pointings) with enough sensitivity in the 110W and 160W filters to identify 6 extremely red resolved sources which are prime candidates for J-band dropouts. Their complete absence of detectable J band flux can be caused by an opaque Lyman cut-off at z=8-10. We propose to followup these candidates with NICMOS imaging and jointly propose Spitzer IRAC photometry. Deep F110W and Spitzer/IRAC 3.5/4.8 micron imaging will confirm if any of these candidates are indeed Lyman Break galaxies observed less than 500 Myrs after the Big Bang. Genuine LBGs will remain undetected in F110W, while being detected with flat spectra in the IRAC bands. The combined SED will provide information about the stellar mass of these galaxies, and the possible presence of evolved stars or dust reddening. The proposed observations will be sensitive enough to detect the F110W flux from galaxies as red as (J-H)=2.8 (AB mags, 5 sigma). If any of the candidates are detected with bluer colors, they will most likely be exceptional "Distant Red Galaxies" at z of 4 to 6. The proposed data will constrain the stellar populations of these extraordinarily red galaxies, which would be candidates for the earliest, most massive galaxies which formed.

From our NICMOS Parallel program in cycles 11, 12, and 13, we have identified six candidates for J-dropout Lyman Break Galaxies (LBGs) at z>7. These galaxies were selected as having [F110W] - [F160W] > 1.8 (AB), with no detection in F110W. In this program, we will obtain more sensitive observations in the F110W filter, to provide a more meaningful lower limit in color. We seek to reach a 5 sigma lower limit in color of [F110W] - [F160W] > 2.8. The J-dropout candidates have an average [F160W]~24, so the appropriate depth in [F110W] can be reached in 4-6 orbits per source. Any candidate that remains undetected in these deeper observations is likely a genuine J-dropout. To further verify this, we will observe each candidate with IRAC on Spitzer. If they are indeed dropouts, their spectral energy distributions (SEDs) will be flat in frequency space, giving similar fluxes in all of the IRAC bands. We therefore required a 5 sigma sensitivity of 1 uJy. This can be achieved in 15 minutes of exposure in IRAC1 and 50 minutes of exposure in IRAC2. If the J-dropout candidates are detected in the F110W images, then they are not genuine z>7 galaxies, but most likely contain lower redshift evolved stellar populations. 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