A comprehensive study of forming galaxies

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05286
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Shimasaku Kazuhiro 東京大学, 大学院理学系研究科(理学部), 准教授 (00251405)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 光学赤外線天文学 / 銀河の形成と進化 / 測光観測

Outline of Final Research Achievements

Using data taken with two wide-field optical cameras on the Subaru Telescope, I studied the properties of forming galaxies in ~ 800 - 3,000 million years-old universes. The galaxy samples used for this study are the largest ever obtained. The most important result is that the number density of galaxies was obtained as a function of luminosity and redshift. In addition, the origin of diffuse Lyman alpha halos around young galaxies was also identified; this is important to study the role of the matter around galaxies in galaxy evolution.

Free Research Field

銀河天文学

Academic Significance and Societal Importance of the Research Achievements

遠方 (過去) の宇宙の多数の銀河のサンプルおよびそれに基づく銀河の光度や質量の統計は、銀河進化モデルへの制限につながるだけでなく、宇宙再電離という現象がいつどのように起きたかを明らかにする上でも役に立つ。今後のより遠方の銀河観測や、個々の銀河の詳細な観測のための基礎データともなる。