Astrophys. J., 505, L95-L98 (1998/October-1)
Keck spectroscopy and NICMOS photometry of a redshift z = 5.60 galaxy.
WEYMANN R.J., STERN D., BUNKER A., SPINRAD H., CHAFFEE F.H., THOMPSON R.I. and STORRIE-LOMBARDI L.J.
Abstract (from CDS):
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 4-473.0 in the Hubble Deep Field (HDF), with a detection of an emission line consistent with Lyα 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 H0=65 km.s–1.Mpc–1 and q0=0.125, the 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 EB-V∼0.06. The measured flux in the Lyα line is approximately 1.0x10–17 ergs.cm–2.s–1, and the rest-frame equivalent width, correcting for the absorption caused by intervening H I, is ∼90 Å. 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 Lyα 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.
Cosmology: Early Universe - Galaxies: Distances and Redshifts - Galaxies: Evolution - Galaxies: Formation
Status at CDS:
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