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We present Keck LRIS spectroscopy along with NICMOS F110W (~J) and F160W (~H)images of the galaxy HDF4-473.0 (hereafter 4-473) in the Hubble Deep Field,with a detection of an emission line consistent with Ly-alpha at a redshift ofz=5.60. Attention to this object as a high redshift galaxy was first drawn byLanzetta, Yahil and Fernandez-Soto and appeared in their initial list ofgalaxies with redshifts estimated from the WFPC2 HDF photometry. It wasselected by us for spectroscopic observation, along with others in the HubbleDeep Field, on the basis of the NICMOS F110W and F160W and WFPC2 photometry.For H_0 = 65 and q_0 = 0.125, use of simple evolutionary models along with theF814W (~I), F110W, and F160W magnitudes allow us to estimate the star formationrate (~13 M(solar)/yr). The colors suggest a reddening of E(B-V) ~ 0.06. Themeasured flux in the Ly-alpha line is approximately 1.0*10^(-17) ergs/cm/s andthe restframe equivalent width, correcting for the absorption caused byintervening HI, is approximately 90AA. The galaxy is compact and regular, butresolved, with an observed FWHM of ~0.44". Simple evolutionary models canaccurately reproduce the colors and these models predict the Ly-alpha flux towithin a factor of 2. Using this object as a template shifted to higherredshifts, we calculate the magnitudes through the F814W and two NICMOSpassbands for galaxies at redshifts 6 < z < 10.Comment: accepted version--ApJ Letters, predicted high-z colors refined,  improved references to earlier photometric redshift estimates, title change

Keck Spectroscopy and NICMOS Photometry of a Redshift [CLC][ITAL]z[/ITAL][/CLC] = 5.60 Galaxy