Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-02
Astrophys.J.600:L99-L102,2004
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ Letters for the GOODS special issue. GOODS information and data can be found at http://www.stsci.edu/science/
Scientific paper
10.1086/381119
We report early results on galaxies at z~6, selected from Hubble Space Telescope imaging for the Great Observatories Origins Deep Survey. Spectroscopy of one object with the Advanced Camera for Surveys grism and from the Keck and VLT observatories a shows a strong continuum break and asymmetric line emission, identified as Lya at z=5.83. We detect only five spatially extended, z~6 candidates with signal-to-noise ratios > 10, two of which have spectroscopic confirmation. This is many fewer than would be expected if galaxies at z=6 had the same luminosity function as those at z=3. There are many fainter candidates, but we expect substantial contamination from foreground interlopers and spurious detections. Our best estimates favor a z=6 galaxy population with fainter luminosities, higher space density, and similar co-moving ultraviolet emissivity to that at z=3, but this depends critically on counts at fluxes fainter than those reliably probed by the current data.
Chornock Ryan
Cristiani Stefano
Dawson Sally
Dey Arjun
Dickinson Marc
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