Thursday, August 17, 2006

R. Bouwens: Galaxies Buildup in the Frist 2 Gyr

UV-luminosity functions at z=4,5,6 are presented and no evolution is found at the low mass end and the slope is steep there (-1.75). However, at the high-mass end things get brighter with time. This is the opposite of downsizing that I wrote about yesterday.

Converting this to the Madau plot means that it peaks around z=4 and declines towards 5 and 6. This is heavily debated since the dust-correction at high z is fairly uncertain.

Going even further (z-J), they found 4 candidates of z~7-8 galaxies (Bouwens & Illingworth, Nature 2006).

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