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

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Abstract

We present Keck Low Resolution Imaging Spectrometer spectroscopy along with Near-Infrared Camera and Multiobject Spectrometer (NICMOS) F110W (J) and F160W (H) images of the galaxy HDF 4473.0 in the Hubble Deep Field (HDF), with a detection of an emission line consistent with Lya at a redshift of . z 5.60 Attention to this object as a high-redshift galaxy was first drawn by Lanzetta, Yahil, & Fernandez-Soto and appeared in their initial list of galaxies with redshifts estimated from the Wide Field Planetary Camera 2 (WFPC2) HDF photometry. It was selected by us for spectroscopic observation, along with others in the HDF, on the basis of the NICMOS F110W and F160W and WFPC2 photometry. For km s 1 Mpc 1 and , the H 65 q 0.125 0 0 use of simple evolutionary models along with the F814W (I), F110W, and F160W magnitudes allow us to estimate the star formation rate (13 M , yr 1 ). The colors suggest a reddening of . The measured E(B V ) 0.06 flux in the Lya line is approximately ergs cm 2 s 1 , and the rest-frame equivalent width, correcting 17 1.0 # 10 for the absorption caused by intervening H i, is 90 A . The galaxy is compact and regular, but resolved, with an observed FWHM of 0 .44. Simple evolutionary models can accurately reproduce the colors, and these models predict the Lya flux to within a factor of 2. Using this object as a template shifted to higher redshifts, we calculate the magnitudes through the F814W and two NICMOS passbands for galaxies at redshifts . 6 ! z ! 10

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