NOAO >   Observing Info >   Approved Programs >   2010B-0437

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Proposal Information for 2010B-0437


PI: Arjun Dey, NOAO, dey@noao.edu
Address: 950 N. Cherry Ave., Tucson, AZ 85719, USA

CoI: Naveen Reddy, NOAO
CoI: Moire Prescott, University of California, Santa Barbara
CoI: Mark Brodwin, CfA
CoI: Lei Xu, Steward Observatory

Title: The Origin and Evolution of Low-Redshift (z<2) Lyman Alpha Emitting Galaxies

Abstract: Low luminosity galaxies contribute significantly to the mass and star-formation density of the universe at early epochs. Ly(alpha) emitting galaxies (LAEs) are powerful probes of the low-luminosity end of the luminosity function, and are also used to place constraints on the reionization epoch and the early mass assembly of galaxies. Most LAE studies have focused primarily on high redshifts (z~3-7) where the physical nature and large-scale context of LAEs remain largely unconstrained. In order to remedy this situation, we have begun a survey for LAEs at 1.8<z<2.0, the lowest redshifts feasible from the ground. We have successfully identified large samples of LAEs, and spectroscopically confirmed our selection method. Here, we propose to extend our spectroscopic study to the UDS field, which has existing deep \it Spitzer imaging, and is targeted for deep near-IR imaging by the Hubble Multi-Cycle Treasury Program. The near- and mid-IR data coupled with spectroscopic redshifts are essential for determining the age and mass distributions of the LAEs. Our study will create the largest sample (~100) of spectroscopically confirmed LAEs with existing deep near- and mid-IR imaging, and will thus provide robust measurements of the stellar masses, ages, and reddening of LAEs, enabling us to directly determine their significance in the z~1.9 universe.


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



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