Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20706l&link_type=abstract
Spitzer Proposal ID #20706
Other
Scientific paper
Using SST Legacy IRAC data in the CDFS from GOODS and our own GO-1 IRAC data, we have found that z>5 Lyman Break Galaxies (LBGs) appear typically to have formed most of their stars over approximately a crossing time (<100 Myrs). This combined with their apparent strong clustering and relatively low number density suggests that the population is highly stochastic (or colloquially, they have a short "duty cycle"). These results are from only 2 regions of about 160 sq arcmin each, and limited numbers of sources (especially with measured redshifts), cosmic variance, and the likely stochastic nature of these high redshift sources emphasizes the need for more areas with spectroscopically confirmed high redshift LBGs to get an unbiased view of the population characteristics. We are therefore proposing to expand these already exciting results to image 10 more fields of a combined area of about ~450 sq arcmin for which over the next year we will obtain approximately 100 spectroscopically confirmed z>5 galaxies in the 3.6, 4.5, 5.8 and 8.0 micron bands with IRAC. When combined with our existing deep optical data on these fields, we can determine the complete observed SEDs of the sources to 4.5 microns, and possibly to 8 microns (as we have done for the other fields). Using these SEDs we can determine approximate star formation histories, extinctions, photometric masses, and photometric redshifts for those sources for which we fail to get redshifts. This will allow us to determine: (1) if the galaxies contributed significantly to reionization which looks unlikely if reionization occurred at z~17 or we fail to begin to find significant numbers of galaxies older than 100 Myrs at these redshifts, (2) are likely to be driving winds and thus contribute significantly to the early metal-enrichment of the IGM, (3) the actual star-formation rate density at z~5.5, (4) how strongly the sources are correlated, refining their estimated duty cycle and bias, and many other issues of fundamental importance to cosmology.
Aragon-Salamanca Alfonso
Bremer Malcolm
Charlot Stephane
Clowe Douglas
Douglas Laura
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