Surface Brightness Properties of z˜4-6 Galaxies in the HUDF

Details Surface Brightness Properties of z˜4-6 Galaxies in the HUDF Surface Brightness Properties of z˜4-6 Galaxies in the HUDF

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917102h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #171.02; Bulletin of the American Astronomical Society,

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The Hubble Ultra-Deep Field (HUDF) provides imaging deep enough that we can study surface brightness properties for a representative sample of high redshift galaxies at z=4-6. By separately coadding V, i' and z'-band HUDF images of sets of z˜4,5,6 objects, pre-selected to have nearly identical sizes and shapes, we are able to study the averaged radial structure of these objects at much higher signal-to-noise. We observe evolution of the radial surface brightness profiles with redshift, and place the observed differences within the context of galaxy formation scenarios.
Additionally, a comparison of the UV surface brightness from z=0-6 shows little evolution in the surface density of star-formation in star-forming galaxies. We use this as a Tolman test to confirm the cosmological surface brightness dimming expected under standard cosmological models.
This work was supported by HST grant GO 10530.

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