NOAO >   Observing Info >   Approved Programs >   2013A-0736

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Proposal Information for 2013A-0736


PI: Takatoshi Shibuya, GUAS/NAOJ, takatoshi.shibuya@nao.ac.jp
Address: Subaru building, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan

CoI: Nobunari Kashikawa, GUAS/NAOJ
CoI: Kazuaki Ota, Kyoto University
CoI: Pascale Hibon, Gemini-South Observatory
CoI: Masanori Iye, GUAS/NAOJ

Title: The Widest Survey for Lyman Break Galaxies at z=7

Abstract: We propose a deep \it Y-band imaging survey for Lyman Break Galaxies (LBGs) at z=7 by using the CTIO Blanco 4m Telescope/DECam. This proposed observation was accepted in the DECam SV program as the top tier rank. However, it has not been completed due to unexpected guiding and tracking problems of the telescope. We would like to continue our survey for z=7 LBGs in the DECam special call for proposal. The survey field is the Subaru/\it XMM-Newton Deep survey Field which is the widest deep field of Subaru. The total survey area and volume is 1.3 deg^2 and 6.3 \times 10^6 Mpc^3, respectively, providing us the largest survey for LBGs at z=7 to date. We are expected to detect a few dozen bright LBGs in the survey. The bright- end slope of the luminosity function can be determined with a small uncertainty by combining the detected bright LBGs and faint samples constructed by the \it Hubble Space Telescope survey, allowing us to investigate the relation between the formation of the most luminous galaxies and feedback at z=7. Moreover, ionized bubble(s) would be present in the field, because z=7.3 Ly(alpha) Emitters (LAEs) assemble in the small region, based on our previous narrow-band imaging. We also investigate the spatial relation between ionizing sources and neutral hydrogen gas clouds at z~7 by comparing the position of LBGs and LAEs.


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