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

• Project/Area Number: 18H01259
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: サヌエザ パトリシオ 国立天文台, アルマプロジェクト, 特任助教 (70769348)
• Co-Investigator(Kenkyū-buntansha): 中村 文隆 国立天文台, 科学研究部, 准教授 (20291354)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Granted (Fiscal Year 2020)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2020: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000); Fiscal Year 2019: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
• Keywords: high-mass star formation / Molecular Clouds / IMF / ALMA / High-Mass Star Formation / Moelcular Clouds

Outline of Annual Research Achievements

As planned, during the second fiscal year we focused on the enhanced data products. Self-calibration has been performed for all fields in both the 12 and 7 m array observations. Continuum images are finished and currently used for the first science articles.

The first paper from the Japanese team is nearly finished, including magnetic field observations. The PI of the project and the hired postdoc have published several articles related to ALMA-IMF and presented in several conferences and workshops, including a public talk.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

The enhanced data products (self-calibration) were produced on time as expected. Analysis of the data has been done simultaneously. In addition to working on the paper focused on G10.62, the PI and the hired postdoc have been analyzing different algorithms for source extraction. The source extraction is key for the final goal of the project, produce the core mass function (CMF) for all fields in the survey.

Early results have been presented in conferences and analysis plans have been successfully applied in other projects, producing several papers (one as first author for the KAKENHI PI and another one as PI for the hired postdoc, and several other articles as co-authors).

Strategy for Future Research Activity

During the final fiscal year we will make the data cubes. All major spectral lines will be imaged. It is the plan to prepare and release to the astronomical community the continuum and line cubes used in the first publication. The first articles from the whole international team will be published. Our Japanese team will focus on the study of the G10.62 region as a first publication.

Research Products

• [Journal Article] Large-scale Molecular Gas Distribution in the M17 Cloud Complex: Dense Gas Conditions of Massive Star Formation? (2020)
  • Author(s): Quang Nguyen-Luong, Fumitaka Nakamura, Koji Sugitani, Tomomi Shimoikura, Kazuhito Dobashi, Shinichi W. Kinoshita, Kee-Tae Kim, Hynwoo Kang, Patricio Sanhueza, Neal J. Evans II and Glenn J. White
  • Journal Title: The Astrophysical Journal Volume: 891 Pages: 66-80
  • DOI: 10.3847/1538-4357/ab700a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of Feedback of Massive Stars in the Fragmentation, Distribution, and Kinematics of the Gas in Two Star-forming Regions in the Carina Nebula (2020)
  • Author(s): Rebolledo, David; Guzman, Andres E.; Contreras, Yanett; Garay, Guido; Medina, S. -N. X.; Sanhueza, Patricio; Green, Anne J.; Castro, Camila; Guzman, Viviana; Burton, Michael G.
  • Journal Title: The Astrophysical Journal Volume: 891 Pages: 113-138
  • DOI: 10.3847/1538-4357/ab6d76
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] GMC Collisions as Triggers of Star Formation. VII. The Effect of Magnetic Field Strength on Star Formation (2020)
  • Author(s): Wu, Benjamin; Tan, Jonathan C.; Christie, Duncan; Nakamura, Fumitaka
  • Journal Title: The Astrophysical Journal Volume: 891 Pages: 168-190
  • DOI: 10.3847/1538-4357/ab77b5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The ALMA Survey of 70μm Dark High-mass Clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation (2019)
  • Author(s): Sanhueza, P., Contreras, Y., Wu, B., Jackson, J. M., Guzman, A. E., Zhang, Q., Li, S., Lu, X., Silva, A., Izumi, N., Liu, T., Miura, R. E., Tatematsu, K., Sakai, T., Beuther, H., Garay, G., Ohashi, S., Saito, M., Nakamura, F., Saigo, K., Veena, V. S., Nguyen-Luong, Q., & Tafoya, D.
  • Journal Title: The Astrophysical Journal Volume: 886 Pages: 102-130
  • DOI: 10.3847/1538-4357/ab45e9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nobeyama 45 m mapping observations toward the nearby molecular clouds Orion A, Aquila Rift, and M17: Project overview (2019)
  • Author(s): Nakamura, F., Ishii, S., Dobashi, K., Shimoikura, T., Shimajiri, Y., Kawabe, R., Tanabe, Y., Hirose, A., Oyamada, S., Urasawa, Y., Takemura, H., Tsukagoshi, T., Momose, M., Sugitani, K., Nishi, R., Okumura, S., Sanhueza, P., Nguyen-Luong, Q., & Kusune, T.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Pages: 1-28
  • DOI: 10.1093/pasj/psz057
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Massive and low-mass protostars in massive "starless" cores (2019)
  • Author(s): Pillai, Thushara; Kauffmann, Jens; Zhang, Qizhou; Sanhueza, Patricio; Leurini, Silvia; Wang, Ke; Sridharan, T. K.; Konig, Carsten
  • Journal Title: Astronomy & Astrophysics (A&A) Volume: 622 Pages: 54-64
  • DOI: 10.1051/0004-6361/201732570
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Filamentary Accretion Flows in the Infrared Dark Cloud G14.225?0.506 Revealed by ALMA (2019)
  • Author(s): 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
  • Journal Title: The Astrophysical Journal (ApJ) Volume: 875 Pages: 24-24
  • DOI: 10.3847/1538-4357/ab0f3e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Infall Signatures in a Prestellar Core Embedded in the High-mass 70 μm Dark IRDC G331.372-00.116 (2018)
  • Author(s): 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
  • Journal Title: The Astrophysical Journal (ApJ) Volume: 861 Pages: 14-22
  • DOI: 10.3847/1538-4357/aac2ec
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] The ALMA Survey of 70 um Dark High-mass Clumps in Early Stages (ASHES) (2020)
  • Author(s): Sanhueza, Patricio
  • Organizer: ALMA-J Seminar, NAOJ
  • Invited
• [Presentation] Magnetic Fields in High-Mass Star Forming Regions: G10.62-0.38 (2020)
  • Author(s): Wu, Benjamin; Sanhueza, Patricio; Nakamura, Sanhueza
  • Organizer: East Asian ALMA Science Workshop, Taipei, Taiwan
  • Int'l Joint Research
• [Presentation] The ALMA Survey of 70 um Dark High-mass Clumps in Early Stages (ASHES) (2020)
  • Author(s): Sanhueza, Patricio; Wu, Benjamin; Nakamura, Fumitaka
  • Organizer: East Asian ALMA Science Workshop, Taipei, Taiwan
  • Int'l Joint Research / Invited
• [Presentation] Tips for ALMA Proposals (2020)
  • Author(s): Sanhueza, Patricio
  • Organizer: ALMA Users Meeting, NAOJ
  • Invited
• [Presentation] The Inception of Massive Stars in a Dynamic, Magnetized Interstellar Medium (2019)
  • Author(s): Wu, Benjamin; Sanhueza, Patricio
  • Organizer: Kavli IPMU Seminar
  • Invited
• [Presentation] High-mass Star Formation (2019)
  • Author(s): Sanhueza, Patricio; Wu, Benjamin
  • Organizer: Universidad de Barcelona, Spain
  • Int'l Joint Research / Invited
• [Presentation] A Comprehinsive Study of High-mass Star-forming Regions (2019)
  • Author(s): Sanhueza, Patricio
  • Organizer: ARC Science Meeting, NAOJ
  • Invited
• [Presentation] MHD Simulations of Star Cluster-Forming Clumps (2019)
  • Author(s): Wu, Benjamin; Sanhueza, Patricio
  • Organizer: Workshop on Cluster Formation and Dust Formation, Kiyosato, Japan
  • Invited
• [Presentation] Cloudy with a chance of massive stars: Connecting star cluster formation with its environment (2019)
  • Author(s): Wu, Benjamin; Sanhueza, Patricio; Nakamura, Fumitaka
  • Organizer: Laboratoire d'Astrophysique de Bordeaux Seminar, Bordeaux, France
  • Int'l Joint Research / Invited
• [Presentation] Magnetic Fields in High-Mass Star Forming Regions: The Case of G10.62-0.38 (2019)
  • Author(s): Wu, Benjamin; Sanhueza, Patricio; Nakamura, Fumitaka
  • Organizer: ALMA Science Meeting 2019, Cagliari, Italy
  • Int'l Joint Research
• [Presentation] Cloud Computing for Computing Clouds: Machine learning applications from space exploration to star formation (2019)
  • Author(s): Wu, Benjamin
  • Organizer: ALMA-J Seminar, NAOJ
  • Invited
• [Presentation] ALMA-IMF: ALMA transforms our view of the origin of stellar masses III (2019)
  • Author(s): Sanhueza, Patricio; Benjamin, Wu
  • Organizer: Japan Astronomical Society (ASJ) Meeting
• [Presentation] ALMA-IMF: ALMA transforms our view of the origin of stellar masses I (2018)
  • Author(s): Sanhueza, Patricio; Nakamura, Fumitaka
  • Organizer: Japan Astronomical Society (ASJ) Meeting
• [Presentation] ALMA-IMF: ALMA transforms our view of the origin of stellar masses II (2018)
  • Author(s): Benjamin, Wu; Sanhueza, Patricio
  • Organizer: East-Asian ALMA Science Workshop