NOAO >   Observing Info >   Approved Programs >   2006B-0165

Small NOAO Logo

Proposal Information for 2006B-0165


PI: Sara Ellison, University of Victoria, sarae@uvic.ca
Address: Department of Physics & Astronomy, 3800 Finnerty Rd, Victoria, BC V8V 4L1, Canada

CoI: Jessica Rosenberg, Harvard CfA
CoI: Martin Zwaan, ESO

Title: The Damped Lyman-alpha System -- Galaxy Connection: Clues from Local HI Galaxy Surveys

Abstract: Damped Lyman-alpha systems (DLAs) trace the evolution of gas in galaxies. However, whilst almost every theoretical model of chemical evolution predicts that DLA metallicities should reach solar at z=0, observed values are barely 1/10 this value. One explanation for this is that the HI cross-section of the gas-rich galaxy population is not dominated by solar metallicity gas. We propose to use the relationship between stellar mass and metallicity to make an estimate of the HI cross- section weighted metallicity for a sample of local analogs to the DLA population. To achieve this, we need J, H and K-band observations to determine galactic stellar masses for the last 10 galaxies in our complete sample which do not appear in the 2MASS survey and which could not be scheduled in 2006A.


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 >   2006B-0165

noaoprop-help@noao.edu

Small NOAO Logo