NOAO >   Observing Info >   Approved Programs >   2010A-0089

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Proposal Information for 2010A-0089


PI: Roberto de Propris, National Optical Astronomy Observatory, rdepropris@ctio.noao.edu
Address: Cerro Tololo Inter-American Observatory, Casilla 603, CL La Serena, Chile

CoI: Philip Lah, NCRA & ANU
CoI: Jayaram Chengalur, National Centre for Radio Astrophysics (NCRA)
CoI: Frank Briggs, Australian National University (ANU)
CoI: Jonghwan Rhee, Australian National University (ANU)
CoI: Matthew Colless, Anglo-Australian Observatory
CoI: Olivier Le Fevre, Laboratoire d'Astrophysique de Marseille
CoI: Bianca Garilli, INAF, IASF-Milano, Italy
CoI: Michael Pracy, Swinburne University of Technology

Title: Gas in Galaxies at Redshift z ~ 0.32

Abstract: We are carrying out a project to measure the neutral atomic hydrogen gas (HI) content of the universe at a redshift of z \around 0.32. We are requesting observations preferably using MMT/Hectospec or otherwise Hydra-CTIO to obtain precise optical redshifts for galaxies between z=0.30 and 0.34 in a field that we are observing with the Giant Metrewave Radio Telescope (GMRT). These redshifts will be used to coadd the HI 21-cm flux from the galaxies in this field and so measure the mean gas content of the galaxies. The star formation rate density of the universe is known to have dropped by a factor of ten since redshift z \around 1. However, the neutral atomic hydrogen gas content of galaxies - the fuel supply for star-formation - is currently only poorly constrained by observations over this period. With this uncertainty in the gas content of galaxies it is difficult to decipher the processes causing this decrease in the star formation rate density. This project will expand our understanding of the evolution of galaxies by examining their gas content before the Square Kilometre Array (SKA) is built.


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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