NOAO >   Observing Info >   Approved Programs >   2011B-0569

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Proposal Information for 2011B-0569


PI: Zhenya Zheng, Arizona State University, Zhenya.Zheng@asu.edu
Address: School of Earth and Space Exploration, Physical Sciences F-686, ASU, Tempe, AZ 85287-1404, USA

CoI: Emily McLinden, ASU
CoI: Sangeeta Malhotra, ASU
CoI: James Rhoads, ASU
CoI: Steven Finkelstein, Texas A&M
CoI: Junxian Wang, USTC

Title: Understanding Lyman Alpha Emitters by concentrating discovery in the CDF-S

Abstract: We propose a new narrowband imaging survey for \lya emitting objects at z=2.9 in the Chandra Deep Field-South (CDF-S), using three contigous narrow-band filters. This survey will double the number of \lya emitters in the CDF-S leading to better understanding of the physical properties of \lya galaxies such as: (1) \lya escape fraction: By stacking 4Ms of Chandra data for 122 known \lya galaxies we have placed sensitive upper limits on the unextinguished star- formation rates derived from X-ray emission. By comparing the SFR from \lya and X-rays we conclude that \ge 17% of \lya photons escape these galaxies. By doubling the sample we will either measure or constrain the unextinguished SFR and the average \lya photon escape fraction. (2) Using ~ 620 galaxies at 2.82 < z < 2.94, we will derive the correlation function and thus halo masses, halo occupation distribution, and duty cycle of these galaxies. (3) We will use the very sensitive multiwavelength data in CDF-S to derive ages and masses of the stellar populations of about 250 galaxies, where only tens have been done before. (4) Our new sample will quadruple the intermediate-redshift sample size in CDFS, \it and improve its redshift coverage, allowing us to establish whether the clear evolution seen at 0.3<z<3 was already beginning at z~ 3.


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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