A multiwavelength study on interstellar chemistry in low-metallicity environments

• Project/Area Number: 15K17612
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Tohoku University
• Principal Investigator: Shimonishi Takashi 東北大学, 学際科学フロンティア研究所, 助教 (80725599)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 赤外線天文学 / 電波天文学 / 星間化学 (アストロケミストリー) / 星間分子 / 氷 / マゼラン雲 / 系外銀河 / ホットコア / 星間化学 / 光赤外線天文学 / アストロケミストリー / 星間物質 / 分子

Outline of Final Research Achievements

This study aims to reveal the chemical diversity of interstellar medium in the universe. In this project, based on astronomical observations with state-of-the-art telescopes, we investigated properties of interstellar molecules in nearby low-metallicity galaxies, which potentially have common environmental characteristics with past galaxies. Particularly, we focused on understanding of interstellar chemistry in various phases of interstellar medium (molecular gas, ices, and dust), with the aid of multiwavelength observations from infrared to radio. As a result, a number of astrochemically important objects, such as protostars deeply embedded in icy dust with organic molecules and protostars surrounded by a cocoon of warm molecular gas (hot molecular core), were detected outside our Galaxy. Detailed analyses have shown that chemical compositions of interstellar molecules in low-metallicity galaxies have different characteristics compared to those in our Galaxy.

Research Products

• [Int'l Joint Research] Institut d'Astrophysique Spatiale/Universite Paris-Sud(France)
• [Journal Article] Adsorption Energies of Carbon, Nitrogen, and Oxygen Atoms on the Low-temperature Amorphous Water Ice: A Systematic Estimation from Quantum Chemistry Calculations (2018)
  • Author(s): Shimonishi Takashi、Nakatani Naoki、Furuya Kenji、Hama Tetsuya
  • Journal Title: The Astrophysical Journal Volume: 855 Issue: 1 Pages: 1-11
  • DOI: 10.3847/1538-4357/aaaa6a
  • NAID: 120007133924
  • Peer Reviewed / Open Access
• [Journal Article] Molecular-cloud-scale Chemical Composition. II. Mapping Spectral Line Survey toward W3(OH) in the 3 mm Band (2017)
  • Author(s): Watanabe Yoshimasa
  • Journal Title: The Astrophysical Journal Volume: 845 Issue: 1 Pages: 1-18
  • DOI: 10.3847/1538-4357/aa89e5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Molecular-cloud-scale Chemical Composition. I. A Mapping Spectral Line Survey toward W51 in the 3 mm Band (2017)
  • Author(s): Watanabe, Yoshimasa; Nishimura, Yuri; Harada, Nanase; Sakai, Nami; Shimonishi, Takashi; Aikawa, Yuri; Kawamura, Akiko; Yamamoto, Satoshi
  • Journal Title: The Astrophysical Journal Volume: 845 Issue: 2 Pages: 1-30
  • DOI: 10.3847/1538-4357/aa7ece
  • NAID: 120007127838
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Study of CO2/H2O Ice Abundance Ratios in Nearby Galaxies with the Akari Near-Infrared Spectroscopy (2017)
  • Author(s): Yamagishi, Mitsuyoshi; Kaneda, Hidehiro; Oyabu, Shinki; Ishihara, Daisuke; Onaka, Takashi; Shimonishi, Takashi; Suzuki, Toyoaki
  • Journal Title: Publications of The Korean Astronomical Society Volume: 32 Issue: 1 Pages: 141-145
  • DOI: 10.5303/pkas.2017.32.1.141
  • Peer Reviewed / Open Access
• [Journal Article] Ice Absorption Features in NIR Spectra of Galactic Objects (2017)
  • Author(s): Mori, Tamami I.; Onaka, Takashi; Sakon, Itsuki; Ohsawa, Ryou; Kaneda, Hidehiro; Yamagishi, Mitsuyoshi; Okada, Yoko; Tanaka, Masahiro; Shimonishi, Takashi
  • Journal Title: Publications of The Korean Astronomical Society Volume: 32 Issue: 1 Pages: 105-107
  • DOI: 10.5303/pkas.2017.32.1.105
  • Peer Reviewed / Open Access
• [Journal Article] AKARI Infrared Camera Survey of the Large Magellanic Cloud (2017)
  • Author(s): Shimonishi, T.; Kato, D.; Ita, Y.; Onaka, T.; AKARI/IRC LMC Team
  • Journal Title: Publications of The Korean Astronomical Society Volume: 32 Issue: 1 Pages: 83-85
  • DOI: 10.5303/pkas.2017.32.1.083
  • Peer Reviewed / Open Access
• [Journal Article] Processing of Interstellar Medium as Divulged by Akari (2017)
  • Author(s): Onaka, Takashi; Mori, Tamami I.; Ohsawa, Ryou; Sakon, Itsuki; Bell, Aaron C.; Hammonds, Mark; Shimonishi, Takashi; Ishihara, Daisuke; Kaneda, Hidehiro; Okada, Yoko; Tanaka, Masahiro
  • Journal Title: Publications of The Korean Astronomical Society Volume: 32 Issue: 1 Pages: 77-81
  • DOI: 10.5303/pkas.2017.32.1.077
  • Peer Reviewed / Open Access
• [Journal Article] The Detection of a Hot Molecular Core in the Large Magellanic Cloud with ALMA (2016)
  • Author(s): Shimonishi, T., Onaka, T., Kawamura, A., & Aikawa, Y.
  • Journal Title: The Astrophysical Journal Volume: 827 Issue: 1 Pages: 1-20
  • DOI: 10.3847/0004-637x/827/1/72
  • Peer Reviewed / Open Access
• [Journal Article] Spectral Line Survey toward a Molecular Clouds in IC10 (2016)
  • Author(s): Yuri Nishimura, Takashi Shimonishi, Yoshimasa Watanabe, Nami Sakai, Yuri Aikawa, Akiko Kawamura, and Satoshi Yamamoto
  • Journal Title: Astrophysical Journal Volume: 829 Issue: 2 Pages: 94-101
  • DOI: 10.3847/0004-637x/829/2/94
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 μm band (2016)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, Francois Boulanger
  • Journal Title: Astronomy and Astrophysics Volume: 585 Pages: 1-20
  • DOI: 10.1051/0004-6361/201526559
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Spectral Line Survey Toward Quiescent Giant Molecular Clouds in the Large Magellanic Cloud (2016)
  • Author(s): Nishimura Y., Shimonishi, T., Watanabe, Y., Sakai, N., Aikawa, Y., Kawamura, A., Yamamoto, S.
  • Journal Title: The Astrophysical Journal Volume: 818 Issue: 2 Pages: 1-17
  • DOI: 10.3847/0004-637x/818/2/161
  • Peer Reviewed
• [Journal Article] Concurrent Formation of Carbon and Silicate Dust in Nova V1280 Sco (2016)
  • Author(s): Sakon, I., Sako, S., Onaka, T., Nozawa, T., Kimura, Y., Fujiyoshi, T., Shimonishi, T., Usui, F., Takahashi, H., Ohsawa, R., Arai, A., Uemura, M., Nagayama, T., Koo, B-C., and Kozasa, T.
  • Journal Title: The Astrophysical Journal Volume: 817 Issue: 2 Pages: 145-167
  • DOI: 10.3847/0004-637x/817/2/145
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Systematic Variations in CO2/H2O Ice Abundance Ratios in Nearby Galaxies Found with AKARI Near-Infrared Spectroscopy (2015)
  • Author(s): Yamagishi, M., Kaneda, H., Ishiara, D., Oyabu, S., Onaka, T. Shimonishi, T., and Suzuki, T.
  • Journal Title: Astrophysical Journal Volume: 807 Issue: 1 Pages: 1-7
  • DOI: 10.1088/0004-637x/807/1/29
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Astrochemical observations of low-metallicity star-forming regions (2018)
  • Author(s): Takashi Shimonishi
  • Organizer: High Mass Star Formation Workshop 2018
  • Int'l Joint Research / Invited
• [Presentation] 「マゼラン雲の観測で探る低金属量銀河の星間化学」 (2018)
  • Author(s): 下西 隆
  • Organizer: 日本天文学会春季年会
  • Invited
• [Presentation] 「第一原理計算による星間氷表面への原子の吸着エネルギーの推定 2: 分子雲化学組成への影響」 (2018)
  • Author(s): 下西隆、中谷直輝、古家健次、羽馬哲也
  • Organizer: 日本天文学会春季年会
• [Presentation] 第一原理計算による星間氷表面への原子の吸着エネルギーの推定 1:量子化学計算による系統的予測 (2018)
  • Author(s): 中谷直輝、下西隆、古家健次、羽馬哲也
  • Organizer: 日本天文学会春季年会
• [Presentation] Observations of a hot molecular core in a low metallicity dwarf galaxy (2017)
  • Author(s): Takashi Shimonishi
  • Organizer: IAU Symposium 332, Astrochemistry VII -Through the Cosmos from Galaxies to Planets
  • Place of Presentation: Puerto Varas (Chile)
  • Year and Date: 2017-03-20
  • Int'l Joint Research
• [Presentation] Chemical properties of low metallicity star-forming regions (2017)
  • Author(s): Takashi Shimonishi
  • Organizer: The 4th AKARI International Conference
  • Int'l Joint Research / Invited
• [Presentation] Ices in star-forming regions: the role of metallicity (2017)
  • Author(s): Takashi Shimonishi
  • Organizer: The 10th meeting on Cosmic Dust
  • Int'l Joint Research / Invited
• [Presentation] 「赤外線アストロケミストリーの展望」 (2017)
  • Author(s): 下西隆
  • Organizer: 光赤天連シンポジウム2017
  • Invited
• [Presentation] Observations of ices at low metallicity (2016)
  • Author(s): Takashi Shimonishi
  • Organizer: Ice Age -The Era of the James Web Space Telescope-
  • Place of Presentation: Leiden (Neterland)
  • Year and Date: 2016-10-03
  • Int'l Joint Research / Invited
• [Presentation] First detection of an extragalactic hot molecular core with ALMA (2016)
  • Author(s): 下西 隆
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2016-09-14
• [Presentation] Observations of a hot molecular core in a nearby low metallicity galaxy (2016)
  • Author(s): Takashi Shimonishi
  • Organizer: The 9th meeting on Cosmic Dust
  • Place of Presentation: 東北大学 (宮城県仙台市)
  • Year and Date: 2016-08-15
  • Int'l Joint Research
• [Presentation] Observations of a hot molecular core in the Large Magellanic Cloud with ALMA (2016)
  • Author(s): Takashi Shimonishi
  • Organizer: Star Formation in Different Environments
  • Place of Presentation: Quy Nhon (Vietnum)
  • Year and Date: 2016-07-25
  • Int'l Joint Research
• [Presentation] Observations of Water and Methanol Ices in the Large Magellanic Cloud (2016)
  • Author(s): Takashi Shimonishi
  • Organizer: Water in the Universe: From Clouds to Oceans
  • Place of Presentation: Leiden (Neterland)
  • Year and Date: 2016-04-11
  • Int'l Joint Research
• [Presentation] ALMA Observations of a Hot Molecular Core in the Large Magellanic Cloud (2016)
  • Author(s): Takashi Shimonishi
  • Organizer: Molecular Gas in Galactic Environments
  • Place of Presentation: Charlottesville (USA)
  • Year and Date: 2016-04-04
  • Int'l Joint Research
• [Presentation] 系外銀河における水及び有機分子生成 (2016)
  • Author(s): 下西 隆
  • Organizer: 宇宙生命計算科学連携拠点 第2回ワークショップ
  • Place of Presentation: 筑波大学 (茨城県つくば市)
• [Presentation] VLT infrared spectroscopic observations of high-mass YSOs in the Large Magellanic Cloud (2015)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, and Francois Boulanger
  • Organizer: 第32回Grain Formation Workshop
  • Place of Presentation: 北海道
  • Year and Date: 2015-12-09
• [Presentation] Infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 mm band (2015)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, and Francois Boulanger
  • Organizer: From Interstellar Ices to Polycyclic Aromatic Hydrocarbons
  • Place of Presentation: Annapolis, USA
  • Year and Date: 2015-09-14
  • Int'l Joint Research
• [Presentation] Infrared spectroscopy in the C--H stretching region towards embedded high-mass young stellar objects in the Large Magellanic Cloud (2015)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, and Francois Boulanger
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 兵庫
  • Year and Date: 2015-09-09
• [Presentation] Infrared spectroscopy in the C--H stretching region towards embedded high-mass young stellar objects in the Large Magellanic Cloud (2015)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, and Francois Boulanger
  • Organizer: The 8th meeting on Cosmic Dust
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2015-08-17
  • Int'l Joint Research
• [Presentation] AKARI Infrared Camera Survey of the Large Magellanic Cloud (2015)
  • Author(s): Takashi Shimonishi, Daisuke Kato, Yoshifusa Ita, Takashi Onaka
  • Organizer: IAU General Assembly
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] Infrared spectroscopy in the C--H stretching region towards embedded high-mass young stellar objects in the Large Magellanic Cloud (2015)
  • Author(s): Takashi Shimonishi, Emmanuel Dartois, Takashi Onaka, and Francois Boulanger
  • Organizer: IAU General Assembly
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] Infrared spectroscopy of solid methanol around embedded high-mass YSOs in the LMC (2015)
  • Author(s): 下西隆
  • Organizer: High-mass star-formation workshop
  • Place of Presentation: 東京
  • Year and Date: 2015-07-22
• [Remarks] 銀河系外ホットコアを初検出! -生まれたばかりの星を包む暖かい分子の雲-
  • URL: http://www.tohoku.ac.jp/japanese/2016/09/press20160905-01.html
• [Remarks] ALMA Catches Stellar Cocoon with Curious Chemistry
  • URL: https://www.eso.org/public/news/eso1634/
• [Remarks] Stellar Cocoon Seen for First Time Outside Galaxy
  • URL: https://public.nrao.edu/news/announcements/2016-alma-lmc
• [Remarks] "宇宙の氷"で大マゼラン雲を探る～天の川銀河との違いが明らかに～
  • URL: http://www.sci.tohoku.ac.jp/news/20160301-7724.html