Revealing the physical relation between gas and star formation in U/LIRGs using a dual band submm receiver

2019 Fiscal Year Final Research Report

• Project/Area Number: 15H02074
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Iono Daisuke 国立天文台, アルマプロジェクト, 准教授 (60425402)
• Co-Investigator(Kenkyū-buntansha): 武藤 恭之 工学院大学, 教育推進機構(公私立大学の部局等), 准教授 (20633803) ; 菊池 健一 国立天文台, アルマプロジェクト, 主任研究技師 (90358739) ; 小麥 真也 工学院大学, 教育推進機構(公私立大学の部局等), 准教授 (90548934)
• Project Period (FY): 2015-04-01 – 2020-03-31
• Keywords: 電波天文学 / 銀河進化

Outline of Final Research Achievements

The main goal of this project is to develop and install a new receiver system on ASTE telescope in order to observe the CO(4-3) and CO(3-2) emissions in a sample of Luminous Infrared Galaxies. The data is used to investigate the relationship between moderately dense gas and star formation/AGN activities seen in these colliding galaxy systems. The development and implementation of the new receiver were carried out according to the original plan, and the technical specifications were met. A pre-survey of 26 galaxy was successful, and we found a new correlation between star formation efficiency and galaxy interaction stage. In addition, new data toward a late stage Luminous Infrared Galaxy NGC3256 suggests evidence for dense gas outflows. While these pre-surveys were successful, the main survey which targets 103 sources suffered from instrumental problems of the ASTE telescope and unfortunate poor weather conditions, and hence we could not complete the survey as was designed originally.

Free Research Field

天文学

Academic Significance and Societal Importance of the Research Achievements

銀河の衝突段階と星形成効率の関係がわかり、衝突銀河が星形成に与える影響の理解が深まった。今後、衝突銀河が多く存在する初期宇宙の観測への応用が期待される。また、広帯域受信機の開発成果は電波天文やテラヘルツ関連の国際会議で発表するとともに、複数件論文発表した。成果発表を通じて、ALMAをはじめとする国際プロジェクトにおける日本の技術力や高いプレゼンスを示すことができたと考えている。さらに、国内の大学や国外の研究機関から、開発した受信機の応用に関する共同研究の申し込みをいただき、実際に応用が始まったプロジェクトもある。このことから、高い水準で学術的貢献ができたものと考えている。