Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715705b&link_type=abstract
American Astronomical Society Meeting 207, #157.05; Bulletin of the American Astronomical Society, Vol. 37, p.1418
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Our understanding of the evolution of the UV Luminosity Function and star formation rate density is now quite mature to z ˜ 6, 0.9 Gyr after recombination. A recent compilation of z ˜ 6 galaxies by our group contained ˜ 500 objects and allowed for a robust determination of the LF to luminosities as faint as 0.04 L*. Relative to z ˜ 3 LFs, we find significant evidence for evolution from z ˜ 6. At z ˜ 6, the characteristic luminosity is only half that at z ˜ 3, supporting the idea that galaxies built up through hierarchical processes. Extending this to even higher redshifts (z>6) in the reionization epoch has been difficult due to limited number of statistically-representative samples with sizeable membership. Only modest numbers of such objects have been detected at z>6 ( ˜ 5 z-dropouts - z ˜ 7-8 objects - in the Hubble UDF). Significant limits have also been placed at z ˜ 10 using over 800 orbits of deep NICMOS data. But the situation is improving as a result of new deep HST data. For example, three deep search fields being obtained over the HUDF and its two NICMOS parallel fields have point source sensitivities down to ˜ 28.3 AB mag ( ˜ 0.2L*) in both the optical and infrared. In this talk, we will describe the z ˜ 7 and z ˜ 10 samples we are able to compile from a comprehensive set of deep HST ACS+NICMOS fields, compare them with expectations from z ˜ 6, and comment on the evolution in the UV LF at these early times.
Bouwens Rychard J.
Illingworth Garth D.
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