Exploring the Cosmic Reionization by the Next Generation Surveys and Numerical Simulations

2014 Fiscal Year Final Research Report

• Project/Area Number: 23244025
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: OUCHI Masami 東京大学, 宇宙線研究所, 准教授 (40595716)
• Co-Investigator(Kenkyū-buntansha): UMEMURA Masayuki 筑波大学, 計算科学研究センター, 教授 (70183754) ; MORI Masao 筑波大学, 計算科学研究センター, 准教授 (10338585) ; HAYASHINO Tomoki 東北大学, ニュートリノ科学研究センター, 共同研究者 (10167596)
• Co-Investigator(Renkei-kenkyūsha): SHIMASAKU Kazuhiro 東京大学, 大学院理学系研究科, 准教授 (00251405) ; INOUE Akio 大阪産業大学, 教養部, 准教授 (30411424) ; KASHIKAWA Nobunari 国立天文台, 光赤外研究部, 准教授 (00290883)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 宇宙再電離 / 銀河形成

Outline of Final Research Achievements

We have made two Subaru/HSC narrowband filters, NB921 and NB973, that are difficult to be fabricated, and contributed to obtain the observing time for Subaru Strategic Program. Observations with these two narrowband filters allow us to study the cosmic reionization with the statistical quantities of luminosity/correlation functions derived from the sample of z~7 LAEs that is about 100 times larger than the previous studies, and to compare these physical quantities with the numerical simulations. On the other hand, we have revealed the late reionization history of the increasing neutral hydrogen at z~7, for the first time, from the rapid decrease of Lya emitting galaxy fraction (Ono et al. 2012) and the rapid evolution of Lya luminosity densities at z~7 based on the combination of the previously and newly obtained imaging and spectroscopic data.

Free Research Field

銀河天文学