NOAO >   Observing Info >   Approved Programs >   2007B-0205

Small NOAO Logo

Proposal Information for 2007B-0205


PI: Linhua Jiang, University of Arizona, ljiang@as.arizona.edu
Address: Department of astronomy, 933 North Cherry Avenue, Tucson, AZ 85721, USA

CoI: Xiaohui Fan, University of Arizona

Title: Faint \boldmath z~6 Quasars in the SDSS Deep Stripe: SQIID NIR Photometry of \boldmath i-Dropout Objects

Abstract: We propose to use KP-4m/SQIID to carry out NIR photometry of i- dropout objects with z_AB<21.5 selected from the multi-epoch imaging data of the SDSS Deep Stripe. The proposed observations are the first major step for the discovery of z~6 quasars. Using z_ABJHK broad band photometry, quasar candidates will be efficiently separated from brown dwarfs, which have more than ten times higher surface density. The follow-up spectroscopy will be carried out in the near future to identify quasars. Over the last few years, roughly 20 bright z~6 quasars with z_AB<20 have been discovered, but little is known about fainter quasars at this redshift. With the proposed observations and follow-up spectroscopy, we will obtain a well-defined sample with ~15 faint quasars at z~6, reaching 1.5-2 mag deeper than the bright sample. The faint quasar sample combined with the bright sample will be used to measure the quasar luminosity function at z~6, probe the earliest black hole growth, and constrain the reionization history. This sample will also be used to study chemical enrichment and dust evolution in quasar environments at early epoch.


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 >   2007B-0205

noaoprop-help@noao.edu

Small NOAO Logo