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GOODS 850-5 is a hyperluminous radio-faint submillimeter source in theGOODS-N. Although it is generally agreed that GOODS 850-5 is at a high redshiftz>~4, its exact redshift is unknown. While its stellar SED suggests z~6, itsradio/FIR SED suggests a lower redshift of z~4. To better constrain its stellarSED and redshift, we carried out nano-Jansky sensitivity ultradeep NIRobservations between 1.2 and 2.1 um with the HST and the 8 m Subaru Telescope.Even with such great depths we did not detect GOODS 850-5, and the results showthat it is an extremely curious source. Between the Ks and 3.6 um bands itsspectral slope is >3x that of an ERO, and the flux ratio between the two bandsis >8x that of Lyman breaks. It is quite challenging to explain this unusuallyred color without a Lyman break (which would imply z>17). It requires a largeamount (M* ~ 10^11.5 Msun) of reddened old stars at z~6, coexisting with aneven more extinguished violent ~2400-4400 Msun/yr starburst, which does nothave any associated detectable rest-frame UV radiation. We discuss thediscrepancy between the NIR and radio/FIR photometric redshifts. We concludethat GOODS 850-5 is at least at z>4 and is more likely at z>~6. We describe theunusual properties of GOODS 850-5, including its SED and formation history, andwe discuss the implications of such massive z>6 galaxies.

Ultradeep Near-Infrared Observations of GOODS 850-5