Abstract
The Hubble Space Telescope (HST) Ultra Deep Field 2012 (UDF12) provides
the deepest near-infrared imaging to date of the high redshift Universe.
By effectively doubling the depth of the Wide Field Camera 3
near-infrared imaging in the UDF, with valuable diagnostic imaging
through a new additional filter, the UDF12 program considerably enhances
our understanding of the rest-frame UV properties of star-forming
galaxies in the crucial redshift range z=7-10 when the reionization
process is ending. We present the first unbiased measurements of the UV
continuum slopes of galaxies at z=7 (and the first meaningful measures
at z=8), thereby setting new constraints on the age, metallicity and
ionizing photon escape fractions for early galaxies . We also present
new results on the sizes of these primeval galaxies with more accuracy
than hitherto, and set new constraints on their stellar masses. These
new measurements of the physical properties of the emerging population
of young galaxies are compared with the predictions of the latest
theoretical models of galaxy formation.
Original language | English |
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Publication status | Published - 1 Jan 2013 |
Event | AAS, 221st Meeting of the American Astronomical Society - California, Long Beach, United Kingdom Duration: 6 Jan 2013 → 10 Jan 2013 |
Conference
Conference | AAS, 221st Meeting of the American Astronomical Society |
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Country/Territory | United Kingdom |
City | Long Beach |
Period | 6/01/13 → 10/01/13 |