NOAO >   Observing Info >   Approved Programs >   2009A-0406

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Proposal Information for 2009A-0406


PI: Eiichi Egami, University of Arizona, eegami@as.arizona.edu
Address: Steward Observatory, 933 N Cherry Ave, Tucson, AZ 85721, United States

CoI: Linhua Jiang, University of Arizona
CoI: Tomoki Morokuma, National Astronomical Observatory of Japan
CoI: Nobunari Kashikawa, National Astronomical Observatory of Japan
CoI: Tohru Nagao, Ehime University, Japan
CoI: Masami Ouchi, Carnegie Observatories
CoI: Kazuaki Ota, Riken Research Institute, Japan

Title: Identifying \mbox\boldmath z~7 Galaxies in the Subaru Deep Field Ultra-Deep \mbox\boldmath z'-Band Image

Abstract: The last several years saw a great expansion of our horizon in the Universe as we search for galaxies at higher and higher redshift. The Subaru Deep Field (SDF) survey has played a central role in pushing the redshift limit, and a recent series of studies indicate that the number density of bright Ly(alpha) emitters (LAEs) is decreasing substantially from z ~ 5.7 to 7. This strong evolution with the bright-end of the Ly(alpha) luminosity function (LF) is much faster than that seen with the rest-frame UV continuum LF, suggesting the possibility that at z=6-7 we are probing the tail end of the reionization epoch, where more abundant neutral IGM might extinguish Ly(alpha) emission preferentially compared to the UV continuum. Here, we propose to conduct a Keck/DEIMOS spectroscopic follow-up of ~30 newly found z~7 galaxy candidates discovered through the dropout technique in the ultra-deep (29 hr) Subaru/Suprime-Cam z^\prime-band image of the SDF. More spectroscopic identifications of z ~ 7 galaxies will enable us to constrain the bright end of the Ly(alpha)/UV LF better, and this will in turn allow us to examine whether the deficit of bright LAEs at z~ 7 is as severe as the previous studies suggest.


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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