Magneto-hydrodynamic simulations of galactic gaseous disk
| Project/Area Number |
23740153
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Kyushu University |
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Principal Investigator |
Machida Mami 九州大学, 理学(系)研究科(研究院), 助教 (50455200)
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| Project Period (FY) |
2011-04-28 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 銀河ガス円盤 / 磁気流体数値実験 / 磁気乱流 / 観測的可視化 / 理論天文学 / 粒子加速 |
|---|
| Outline of Final Research Achievements |
We performed three-dimensional magneto-hydrodynamic simulations of galactic gaseous disk due to clarify a mechanism of amplification of galactic magnetic fields. The weak toroidal magnetic fields we assumed initially are amplified by magneto-rotational instability. When the magnetic pressure amplified by MRI became comparable to the gas pressure, magnetic fields are buoyantly rising to the halo region and the ratio of gas pressure to magnetic pressure reached quasi-steady state. We also performed observational visualization using the simulation data. We calculated synchrotron intensity and polarized intensity. The intensity map of GHz-bands traced the magnetic spiral arms inside the galactic disk. On the other hands, halo magnetic fields are observed in MHz-bands.
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Report
(6 results)
Research Products
(34 results)
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[Journal Article] Resolving 4-D Nature of Magnetism with Depolarization and Faraday Tomography: Japanese SKA Cosmic Magnetism Science2016
Author(s)
T. Akahori, Y. Fujita, K. Ichiki, S. Ideguchi, T. Kudoh, M. Machida, H. Nakanishi, H. Ohno, T. Ozawa, K. Takahashi, M. Takizawa
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Journal Title
Japanese SKA Cosmic Magnetism Science
Volume: 1
Pages: 1-24
Related Report
Open Access
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[Journal Article] Dynamo Activities Driven by Magnetorotational Instability and the Parker Instability in Galactic Gaseous Disks2013
Author(s)
Machida, M., Nakamura, K.E., Kudoh, T., Akahori, T., Sofue, Y., Matsumoto, R
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Journal Title
Astrophysical Journal
Volume: Vol.764
Issue: 1
Pages: 81-81
DOI
Related Report
Peer Reviewed
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[Journal Article] Molecular Loops in the Galactic Center ― The Physical Condition in the Whole Loops2011
Author(s)
Kudo, N.; Torii, K.; Machida, M.; Takahashi, K.; Nozawa, S.; Yamamoto, H.; Okuda, T.; Kawamura, A.; Mizuno, N.; Onishi, T.; Matsumoto, R.; Fukui, Y.
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Journal Title
Astronomical Society of the Pacific
Volume: 439
Pages: 69-69
Related Report
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[Presentation] 銀河ガス円盤の観測的可視化2015
Author(s)
町田真美、守田佳永、中村賢仁、赤堀卓也、中西裕之
Organizer
日本SKAサイエンス会議「宇宙磁場」2015
Place of Presentation
鹿児島大学
Year and Date
2015-09-16
Related Report
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