NOAO >   Observing Info >   Approved Programs >   2013B-0166

Small NOAO Logo

Proposal Information for 2013B-0166


PI: Pascal Oesch, UC Santa Cruz, poesch@ucolick.org
Address: Astronomy and Astrophysics Board of Study, Natural Sciences II, Santa Cruz, CA, 95064, USA

CoI: Brad Holden, UC Santa Cruz
CoI: Garth Illingworth, UC Santa Cruz

Title: Emission Line Strengths and Gas-Phase Metallicities for the Massive Galaxy Population at z 3-4

Abstract: Metallicity is a fundamental tool for studying the assembly and formation processes of galaxies. Recently, a tight relation between mass, metallicity and star-formation rate was found to be in place out to z 2.5. At even higher redhifts, however, the massive galaxy population falls below this relation and appears to be less evolved in its metallicity build-up compared to their lower redshift counterparts. However, the samples of massive z 3-4 galaxies with metallicity measurements are still extremely small. We propose a pilot program to target 5 out of 79 very massive (M>10^11 Msun) z 3.5 galaxies extracted from the UltraVISTA catalog over COSMOS. These sources are selected based on photometric redshifts and with this program we will establish the feasibility of performing a larger survey. Our main goal is to observe their OII, Hbeta, and OIII lines with Flamingos-2 NIR spectroscopy in order to measure their redshifts, characterize their rest-frame optical emission line strengths and widths, and push metallicity measurements at z 3.5 to the unexplored mass regime of logM >11 Msol.


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 >   2013B-0166

noaoprop-help@noao.edu

Small NOAO Logo