Surface Brightness Properties of z∼4-6 Galaxies in the HUDF
Abstract
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.- Publication:
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American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2006
- Bibcode:
- 2006AAS...20917102H