ALMA-IMF: ALMA Transforms the View of the Origin of Stellar Masses

2018 年度 実績報告書

• 研究課題/領域番号: 18H01259
• 研究機関: 国立天文台
• 研究代表者: サヌエザ パトリシオ 国立天文台, アルマプロジェクト, 特任研究員 (70769348)
• 研究期間 (年度): 2018-04-01 – 2021-03-31
• キーワード: Molecular Clouds / ALMA / High-Mass Star Formation / IMF

研究実績の概要

As planned, during the first fiscal year we focused on the data quality assurance and calibration. The observations of the 3 fields assigned to the Japanese team (and East Asia team) had no particular problem and data calibration was smooth.

We have already started the preparation of science products and early analysis. We have made a classification of the brightest IR-dark cores based on the presence of hot core lines and outflow emission. We have discovered some high-mass prestellar candidates, which are particularly important for testing theories of high-mass star formation. We have also found complex filamentary structures that define hub-like systems. These findings have been presented in conferences and analysis techniques and tools that will be used have been published in articles.

現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The data verification and calibration was carried out on time as expected. While preparing the enhanced data and science-ready products, scientific discussion is going on.

Early results have been presented in conferences and analysis plans have been successfully applied in other projects, guaranteeing success once they are applied in ALMA-IMF (prestellar-protostellar distinction and filaments analysis).

今後の研究の推進方策

During this second fiscal year we will make enhanced data products by applying self-calibration to the observed mosaics. We will continue the preparation of the first publication from the Japanese team. We will first focus on the G10.62 field that shows a complex network of filaments and over 50 cores. The analysis will be supported by observations of the magnetic field.

研究成果

• [雑誌論文] Massive and low-mass protostars in massive "starless" cores (2019)
  • 著者名/発表者名: Pillai, Thushara; Kauffmann, Jens; Zhang, Qizhou; Sanhueza, Patricio; Leurini, Silvia; Wang, Ke; Sridharan, T. K.; Konig, Carsten
  • 雑誌名: Astronomy & Astrophysics (A&A) 巻: 622 ページ: 54 - 64
  • DOI: 10.1051/0004-6361/201732570
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Filamentary Accretion Flows in the Infrared Dark Cloud G14.225-0.506 Revealed by ALMA (2019)
  • 著者名/発表者名: Chen, Huei-Ru Vivien; Zhang, Qizhou; Wright, M. C. H.; Busquet, Gemma; Lin, Yuxin; Liu, Hauyu Baobab; Olguin, F. A.; Sanhueza, Patricio; Nakamura, Fumitaka; Palau, Aina; Ohashi, Satoshi; Tatematsu, Ken’ichi; Liao, Li-Wen
  • 雑誌名: The Astrophysical Journal (ApJ) 巻: 875 ページ: 24 - 46
  • DOI: 10.3847/1538-4357/ab0f3e
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Infall Signatures in a Prestellar Core Embedded in the High-mass 70 μm Dark IRDC G331.372-00.116 (2018)
  • 著者名/発表者名: Contreras, Yanett; Sanhueza, Patricio; Jackson, James M.; Guzman, Andres E.; Longmore, Steven; Garay, Guido; Zhang, Qizhou; Nguyn-Lu'o'ng, Quang; Tatematsu, Ken'ichi; Nakamura, Fumitaka; Sakai, Takeshi; Ohashi, Satoshi; Liu, Tie; Saito, Masao; Gomez, Laura; Rathborne, Jill; Whitaker, Scott
  • 雑誌名: The Astrophysical Journal (ApJ) 巻: 861 ページ: 14 - 22
  • DOI: 10.3847/1538-4357/aac2ec
  • 査読あり / オープンアクセス / 国際共著
• [学会発表] ALMA-IMF: ALMA transforms our view of the origin of stellar masses III (2019)
  • 著者名/発表者名: Sanhueza, Patricio; Benjamin, Wu
  • 学会等名: Japan Astronomical Society (ASJ) Meeting
• [学会発表] ALMA-IMF: ALMA transforms our view of the origin of stellar masses I (2018)
  • 著者名/発表者名: Sanhueza, Patricio; Nakamura, Fumitaka
  • 学会等名: Japan Astronomical Society (ASJ) Meeting
• [学会発表] ALMA-IMF: ALMA transforms our view of the origin of stellar masses II (2018)
  • 著者名/発表者名: Benjamin, Wu; Sanhueza, Patricio
  • 学会等名: East-Asian ALMA Science Workshop