Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913201b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #132.01; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Sufficient HST ACS and NICMOS data are now available to probe the evolution of the rest-frame UV LF from z 8 to z 4. These data come in the form of two deep wide-area ACS GOODS fields, four even deeper ACS pointings, and one ultra deep ACS pointing (the Hubble Ultra Deep Field), with more than 20 arcmin**2 of deep NICMOS data available over these areas. From these data, we have assembled large samples of galaxies at redshift z 4, 5 and 6 (containing >4200 galaxies, >1000 galaxies, >500 galaxies, respectively). We have derived luminosity functions, luminosity density and star formation rates in a very robust and consistent way to very faint luminosities (0.01L* to 0.04L*). The faint end slopes of these luminosity functions are remarkably uniform and steep (alpha = -1.7), indicating little evolution from z 6 => z 4. L* brightens considerably over this period, but the overall change in the luminosity function is such as to lead to little change in the luminosity density and star formation rate over this period. We also have detected galaxies at z 7-8 and set limits at z 10 directly and through Spitzer observations of z 7 galaxies. These results show strong evidence that the evolution we see at z 4-6 continues into the reionization epoch. In this presentation, we will summarize the remarkable changes that are occurring in the rest-frame UV LF over the first 1.5 Gyr of cosmic time.
Bouwens Rychard
Illingworth Garth D.
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