Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20792s&link_type=abstract
Spitzer Proposal ID #20792
Other
Scientific paper
Analysis of the luminosity function of Lyman Break Galaxies in our deep, wide Keck Deep Fields survey robustly shows that the evolution of the LBG population is differential with luminosity from z~4 to z~3. Two of the possible mechanisms driving this evolution relate to (1) changes in the properties of dust and (2) changes in the duration of starbursting episodes in sub-L* LBGs. We will use archival Spitzer IRAC, HST, and ground-based imaging of GOODS and the HDFs to compare the spectral energy distributions of LBGs as a function of redshift and luminosity and search for related differences in reddening and starburst age. Finding such differences will not only identify the processes responsible for the evolution of the luminosity function but will thereby also point us towards the underlying physical mechanisms that control how galaxies form and evolve at high redshift. The non-detection of such differences will mean that the responsible mechanism lies elsewhere and will give impetus to other lines of attacking the problem. We have experience in analyzing the spectral energy distributions of Lyman Break Galaxies and request salary and other support to allow us to extend our techniques to higher redshifts, larger samples, and fainter objects with no spectroscopic redshifts that we need to help understand the observed evolution of the luminosity function. Significantly, our analysis will compare LBG subsamples in a differential and hence very robust way and thus will help us understand how galaxies are assembled at high redshift.
Sawicki Marcin
Thompson David
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