Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80145b&link_type=abstract
Spitzer Proposal ID #80145
Physics
Scientific paper
We propose to carry out IRAC bands 1 and 2 photometry of a sample of eight extreme UV luminous Lyman Break Galaxies (LBGs) at z = 2.6-3.2 in order to measure their total stellar mass and constrain models of the formation and evolution of the most massive and most luminous galaxies at high-redshift. Studies of high-redshift LBGs in recent years have provided key insight into the history of galaxy assembly at the peak of cosmic star formation activity. However, most previous studies have been limited by small survey volume and could not select the rarest systems. We have carried out wide-field multicolor surveys of LBGs, selected from the NOAO Deep Wide Field Survey Bootes Field and the SDSS Deep Stripe, covering over 200 square degrees, increasing the survey volume by ~2 orders of magnitude. Our initial observations have revealed eight extreme UV luminous galaxies with r ~ 21-22.3, more than 2 magnitudes brighter than typical LBGs in previous studies. At L > 6 L*, they represent the rarest and most intensive star forming systems in the early Universe. Our Spitzer IRAC observations will be combined with ground-based observations in optical and near-IR wavelength to measure the total stellar mass and to constrain the AGN contribution in these galaxies, and probe the evolution history of these UV luminous galaxies. We will study whether they are dominated by young starburst activities, likely associated with major merger or major accretion event, or contain a mature stellar population with large stellar mass and extended star formation history. This will be a first step to unveil the nature of the most extreme galaxies in the early universe, providing a unique laboratory for galaxy formation theory.
Bian Fuyan
Fan Xiaohui
Jiang Linhua
McGreer Ian
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