Molecular torus survey and magnetic field measurement in radio galaxies
Project/Area Number |
18K03712
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 16010:Astronomy-related
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Research Institution | National Astronomical Observatory of Japan |
Principal Investigator |
Kameno Seiji 国立天文台, チリ観測所, 教授 (20270449)
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Project Period (FY) |
2018-04-01 – 2021-03-31
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Project Status |
Completed (Fiscal Year 2020)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | 活動銀河核 / 電波銀河 / 偏波観測 / 分子ガストーラス / 電波干渉計 / 電波天文学 / 活動銀河 |
Outline of Final Research Achievements |
We have observed molecular tori in active galactic nuclei to investigate mass accretion process by measuring physical properties and magnetic fields. We discovered rich molecular absorption species in radio galaxies NGC 1052 and 4261 to identify the molecular tori. Non-detection of polarization indicates Faraday depolarization through the tori. The 0.3-G upper limit of the magnetic field is obtained via Zeeman effect of SO absorption lines. Boltzmann diagram of the SO absorptions indicate that the torus is as hot as 500 K where sulfides sublimate from dusts.
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Academic Significance and Societal Importance of the Research Achievements |
活動銀河核は大質量ブラックホールに降着する物質の重力エネルギーで輝く宇宙で最も高効率かつ大規模なエンジンであり、燃料となる降着物質の起源と組成および降着機構(角運動量輸送機構)が未解明であった。本研究では分子ガストーラスを吸収線で観測することにより、高密度分子ガスとプラズマが非一様に混在するトーラスの構成を解明でき、ミリ波・サブミリ波帯電波干渉計高解像度観測のトーラス調査有効性を示した。トーラスのダスト温度が約500 Kと高温であり、中心核の放射では足りないことから、トーラス内の回転が磁場を介して乱流を生じ、プラズマを生成するまでに加熱する機構が示唆された。
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Report
(4 results)
Research Products
(14 results)
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[Journal Article] Characterizing the Accuracy of ALMA Linear-polarization Mosaics2020
Author(s)
Hull Charles L. H.、Cortes Paulo C.、Gouellec Valentin J. M. Le、Girart Josep M.、Nagai Hiroshi、Nakanishi Kouichiro、Kameno Seiji、Fomalont Edward B.、Brogan Crystal L.、Moellenbrock George A.、Paladino Rosita、Villard Eric
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Journal Title
Publications of the Astronomical Society of the Pacific
Volume: 132
Issue: 1015
Pages: 094501-094501
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] ALMA Polarimetry Measures Magnetically Aligned Dust Grains in the Torus of NGC 10682020
Author(s)
Lopez-Rodriguez, Enrique; Alonso-Herrero, Almudena; Garcia-Burillo, Santiago; Gordon, Michael S.; Ichikawa, Kohei; Imanishi, Masatoshi; Kameno, Seiji; Levenson, Nancy A.; Nikutta, Robert; Packham, Chris
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Journal Title
The Astrophysical Journal
Volume: 893
Issue: 1
Pages: 33-33
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Expanding Radio Lobe associated with 3C 842020
Author(s)
Asada, Keiichi; Inoue, Makoto; Nagai, Hiroshi; Kameno, Seiji
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Journal Title
Perseus in Sicily: From Black Hole to Cluster Outskirts. Proceedings of the International Astronomical Union
Volume: 342
Issue: S342
Pages: 220-221
DOI
Related Report
Int'l Joint Research
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[Journal Article] A Broad HCO+ Absorption Line Associated with the Circumnuclear Torus of NGC 10522019
Author(s)
Sawada-Satoh, Satoko; Byun, Do-Young; Lee, Sang-Sung; Oh, Se-Jin; Roh, Duk-Gyoo; Kameno, Seiji; Yeom, Jae-Hwan; Jung, Dong-Kyu; Oh, Chungsik; Kim, Hyo-Ryoung; Hwang, Ju-Yeon
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Journal Title
The Astrophysical Journal Letters
Volume: 872
Issue: 2
Pages: L21-L21
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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