Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.3504h&link_type=abstract
American Astronomical Society, AAS Meeting #211, #35.04; Bulletin of the American Astronomical Society, Vol. 39, p.787
Other
Scientific paper
In the past decade, ground and space-based observations of high redshift galaxies (z>4) have begun to outline the process of galaxy assembly, but its details remain poorly constrained. In one scenario, the most massive galaxies assemble earlier than their less massive counterparts, while in another, large numbers of low-luminosity dwarf galaxies dominate these earlier times. There is presently little information on the structure and the star-formation process of these high redshift galaxies.
We present results from two complimentary studies in the Hubble Ultra Deep Field (HUDF) to understand the properties of these high redshift galaxies. The HUDF contains significant numbers of B, V and i-band dropout objects. These galaxies are too faint individually to accurately measure their radial surface brightness profiles. We separately co-add V, i and z-band HUDF images of sets of z=4,5,6 objects, pre-selected to have nearly identical compact sizes and the roundest shapes. We generate average surface brightness profiles from the composite images. Our results show that even the faintest z=4-6 galaxies are resolved and the inner profiles are best fit by Sersic profiles with Sersic index n<2.
Using Grism ACS Program for Extragalactic Science (GRAPES), we have spectroscopically confirmed 47 Lyman Break Galaxies at z=5-6 in the HUDF. For these 47 galaxies, we find that the UV spectral slope at z=5-6 is bluer than for z=3 galaxies and the peak star formation intensity (SFR per unit area) does not vary significantly from the local universe to z=5-6. The constancy of this peak intensity implies that the same physical mechanism limits starburst intensity at all redshifts up to z=6.
Funding for various HST related projects was provided by NASA grants HST-GO-9793, HST-GO-10530, HST-GO-9780, HST-AR-10298 & HST-AR-11287 from STScI, which is operated by AURA under NASA contract NAS5-26555.
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