NOAO >   Observing Info >   Approved Programs >   2014B-0156

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Proposal Information for 2014B-0156


PI: Linhua Jiang, Arizona State University, linhua.jiang@asu.edu
Address: Arizona State University, School of Earth and Space Exploration, 550 E Tyler Mall PSF 686, Tempe AZ, 85287, USA

CoI: Eiichi Egami, University of Arizona
CoI: Zhenya Zheng, Arizona State University

Title: Spectroscopic Identification of Three Lyman_alpha Emitters at z 7

Abstract: We propose to use GMOS-S to spectroscopically identify three very promising Lyman_alpha Emitter (LAE) candidates at z 7 found in the Subaru/XMM-Newton Deep Survey field (SXDS). In multi-slit mode, our spectroscopy will simultaneously observe a number of LAE and Lyman-break galaxy candidates at 5.7 < z < 7. The SXDS covers 1.3 sq. deg, and has the deepest optical imaging data among all large (>1 sq. deg) ground-based surveys. Our galaxy candidates were selected by applying the narrow-band technique and dropout technique to these deep images. Because of the high success rate of spectroscopic confirmation of LAEs, we expect that at least two (if not all) of the three z 7 candidates are real LAEs. This will double the number of currently known LAEs and improve the measurement of the Lyman_alpha luminosity function (LF) at z 7. With the improved Lyman_alpha LF, we will examine whether the strong decline of the LF from z 5.7 to 6.5 continues to develop towards higher redshifts. This provides key information about the ionizing state of the IGM during the reionization era. In addition, the SXDS is (partially) covered by various IR data, including the UDS survey, the CANDELS survey, and one of the Spitzer/IRAC explorer programs, etc. The combination of the optical and IR data allows us to model the SEDs of all new galaxies and estimate their physical properties such as age and stellar mass.


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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