NOAO >   Observing Info >   Approved Programs >   2003B-0314

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Proposal Information for 2003B-0314


PI: Caryl Gronwall, Pennsylvania State University, caryl@astro.psu.edu
Address: Dept. of Astronomy & Astrophysics, 525 Davey Lab, University Park, PA 16802

CoI: James Rhoads, Space Telescope Science Institute
CoI: Sangeeta Malhotra, Space Telescope Science Institute
CoI: Zlatan Tsvetanov, Johns Hopkins University
CoI: Zoltan Haiman, Columbia University
CoI: Norbert Pirzkal, ESO/ST-ECF

Title: Spectroscopy of z > 5 Ly(alpha) Emission-Line Galaxies from APPLES

Abstract: Studying the youngest galaxies in the universe is essential to our understanding of galaxy formation and evolution. Recently, a few galaxies have been identified at z ~ 6. In order to study this epoch in detail, however, larger, statistical samples of high-redshift galaxies are needed. One such survey is the ACS Pure Parallel Ly(alpha) Emission Survey (APPLES). APPLES uses the unique combination of slitless spectroscopy and the Advanced Camera for Surveys (ACS) on HST to identify Ly(alpha)-emitting galaxies over the redshift range z=4 - 7. By imaging over a large number of parallel fields, APPLES will identify several hundred high-redshift galaxies which should be young objects, experiencing their first burst of star-formation. We are proposing to obtain follow-up spectroscopy of high-redshift Ly(alpha) emitters identified in the first few APPLES fields in order to: 1) confirm the line identification, and 2) provide higher resolution spectroscopy (the ACS grism spectra have a 2 pixel resolution of 80A) for quantitative measurements of the line widths and profiles. This statistical sample will allow for the measurement of the evolution of galaxies between z=7 and z=4, including their luminosity functions, star formation rates, 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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