NOAO >   Observing Info >   Approved Programs >   2004A-0094

Small NOAO Logo

Proposal Information for 2004A-0094


PI: Xiaohui Fan, University of Arizona, fan@as.arizona.edu
Address: Steward Observatory, 933 N. Cherry Ave, Tucson, AZ 85721, USA

CoI: Michael Strauss, Princeton University
CoI: Joe Hennawi, Princeton University
CoI: Linhua Jiang, University of Arizona

Title: A Survey of z~ 6 Quasars from the SDSS

Abstract: We propose to continue our i-dropout object survey to search for luminous quasars at z~ 6 using MARS on KPNO 4m. A similar program was granted time during semester 2003A. The observation was very successful, with three new quasars at z=5.95, 6.07 and 6.21, respectively. In this semester, we will search for quasars from an additonal ~ 1500 deg^2 of multicolor imaging data recently obtained by the Sloan Digital Sky Survey (SDSS). Objects with i-z > 2.2, z<20.4 and blue z-J color will be selected based on optical and near-IR photometry. Follow-up spectroscopy will be obtained using KPNO 4m/MARS, taking full advantage of this red-optimized spectrograph to probe the 8000 - 10000 Aregion. We expect to find 3 - 6 new quasars at 5.7 < z < 6.5 in the new area, increasing the total number of z~6 objects known by \gtrsim 30%. The high-redshift quasar spectra will be used to probe the evolution of the ionizing background and the epoch of reionization. By measuring the Gunn-Peterson effect along different lines of sight, we will study the inhomogeneity of the reionization process. The quasar sample will also be used to study the evolution of the density and the luminosity functions of the quasar population, and to measure the metallicity of high-redshift quasar environments.


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 >   2004A-0094

noaoprop-help@noao.edu

Small NOAO Logo