High-redshift galaxy evolution

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The deep multi-wavelength data over the wide-area GOODS and deep UDF (plus parallel fields) provides us an unprecedented data set from which to study the extragalactic Universe. Using the combined optical and infrared data available for different segments of these fields, it is possible to select large statistically significant samples of UBViz dropouts, from z˜2 all the way back to z˜10, allowing us to draw conclusions about global trends in galaxy formation and evolution during the first few billion years of the Universe. Here, we report on a few of those trends, discussing the evolution of the star-formation rate density, the evolution in size, and evolution in UV color -- using sophisticated cloning simulations to set our high-redshift expectations and cope with the formidable selection biases (16× increase in surface brightness dimming from z˜2.5 to z˜6). While early results from the GOODS + UDF parallel data sets point toward modest increases in the star-formation rate, size, and reddening from z˜6 to z˜2, data available with the UDF promises to push these trends to even higher redshift and fainter magnitudes. We summarize the early results.

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