NOAO >   Observing Info >   Approved Programs >   2011A-0336

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Proposal Information for 2011A-0336


PI: Steven Finkelstein, Texas A&M University, stevenf@physics.tamu.edu
Address: Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77845

CoI: Seth Cohen, Arizona State University
CoI: Nimish Hathi, Carnegie Observatories
CoI: Sangeeta Malhotra, Arizona State University
CoI: James Rhoads, Arizona State University
CoI: Russell Ryan Jr., University of California Davis
CoI: Rogier Windhorst, Arizona State University
CoI: Zhenya Zheng, Arizona State University

Title: Lyman Alpha Morphologies of LAEs at z ~ 4.4

Abstract: We propose new observations of the GOODS CDF-S with the NB656 (H(alpha)) narrowband filter, which can be used to discover LAEs from z=4.36 - 4.43. A large portion of this field has been observed with the \it Hubble Space Telescope (\it HST) ACS F658N narrowband, allowing the study of resolved \lya emission. This allows detailed investigation into the interstellar media of these galaxies, as radiative transfer can result in different observed sizes of \lya light when compared to rest-frame UV light. Current results from three detected LAEs in the \it HST narrowband imaging shows that LAEs may be larger in their \lya light, implying that an inhomogeneous ISM could be a primary factor in allowing \lya escape, even from dusty galaxies. However, a larger sample of galaxies are needed to ensure this result is robust. Noise due to charge transfer inefficiency in the \it HST ACS data make it difficult to use to discover new LAEs, thus ground-based imaging are necessary to first identify the LAEs. Deeper NB656 imaging will nearly double the sample of LAEs in the region of the CDF-S covered by \it HST, as well as providing a sample of nearly 100 new LAEs in the extended CDF-S region which we will use to study the LAE luminosity function and clustering properties.


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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