NOAO >   Observing Info >   Approved Programs >   2011B-0115

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Proposal Information for 2011B-0115


PI: Naveen Reddy, NOAO, nar@noao.edu
Address: 950 N Cherry Ave, Tucson, AZ 85719, United States

CoI: Max Pettini, IoA, Cambridge
CoI: Dan Stark, IoA, Cambridge
CoI: Joop Schaye, Leiden Observatory
CoI: Olivera Rakic, Leiden Observatory

Title: The Impact of Sub-L* Galaxies on the IGM at High Redshift

Abstract: There is compelling evidence that galaxy-scale outflows may be a primary regulator of star formation in galaxies and chemical enrichment of the IGM. The increasing contribution of UV-faint (sub-L^\ast) galaxies to the luminosity density at z\ga 2 suggests that these uninvestigated faint galaxies may play a large role in the global effects of feedback and metal enrichment. We propose to take advantage of the unique capabilities of Keck-I/LRIS to spectroscopically target a sample of faint galaxies with luminosities that are ~ 10\times smaller than those probed in current outflow studies. We will use these data to measure redshifts that will then be cross-correlated with metal (CIV) absorption line systems along QSO sight-lines to determine the extent to which faint galaxies contribute to IGM enrichment. We will compare the correlation lengths and column densities of systems associated with galaxies over a large dynamic range in luminosity to investigate the relative efficiency of feedback as a function of luminosity and impact parameter. Ultimately, this investigation will shed critical light on the feedback processes that govern the baryonic evolution of galaxies over a wide range of luminosity.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2011B-0115

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