2007 Fiscal Year Final Research Report Summary
Formation of Our Galaxy Studied with Super-High Resolution Next-Generation Simulator
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17340059
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
TOMISAKA Kohji National Astronomical Observatory of Japan, 理論研究部, Professor (70183879)
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| Co-Investigator(Kenkyū-buntansha) |
MAKINO Junichiro National Astronomical Observatory Japan, 理論研究部, Professor (50229340)
WADA Keiichi National Astronomical Observatory Japan, 理論研究部, Assoc. Professor (30261358)
KOKUBO Eiichiro National Astronomical Observatory Japan, 理論研究部, Assoc. Professor (90332163)
MATSUMOTO Tomoaki Hosei. U., Faculty of Humanity and Environment, Assoc. Professor (60308004)
YOSHIDA Naoki Nagoya University, Department of Physics, Assist. Professor (90377961)
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| Project Period (FY) |
2005 – 2007
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| Keywords | galaxy formation / star formation / simulation astronomy / parallelization / adaptive mesh refinement / observational visualization / galactic structure |
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| Research Abstract |
1. We completed (1) a parallelized N-body plus SPH hydro code called ASURA and (2) a PC cluster composed of 16 PC's each connected with a specific hardware for self-gravity (GRAPE). Since these enable us to study the formation process of our Galaxy, we call them Milky Way Simulator (MWS).
(1) We perform high resolution simulations with MWS, in which one galaxy is expressed with 10^7 particles, which is much larger than previous similar simulations. From them, we can trace the condensation process of interstellar gas to form stars up to〜10^2cm-3, which coincides with the density of molecular clouds in our Galaxy.
(2) A phenomenological parameter, C_<eff>, has been assumed, with which the star formation rate per unit volume is assumed as C^<eff>_<eff>×ρ_<gas>/t_<ff>, where>_<gas> as and t_<ff> represent, respectively, the local gas density and free-wall timescale of the gas. Our high resolution simulations indicate us that the star formation rate is well expressed with a radiative cooling time of a gas with a density of 10^0cm_<-3>, irrespective of C_<eff>.
(3) Thus, we obtained a prescription how to manage the star formation in low resolution simulations.
(4) We performed simulations of galaxy-galaxy collision. We found that a star formation burst is expected in the early phase of the collision far before making a galaxy merger.
2. We developed an adaptive mesh refinement (AMR) code for self-gravitating magnetohydrodynamical simulation based on the finite-difference scheme. Calculating the fragmentation process in the protostellar phase, we have confirmed that this code gives the consistent result obtained with previous nested grid code. This enables us to extend the subjects.
3. To compare the simulation result with observation, we have developed a radiative transfer code for molecular rotational transitions based on Monte Carlo method. We have applied this to starburst galaxy and star forming molecular cloud.
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[Presentation] 2007年度の天の川創成プロジェクト2007
Author(s)
斎藤 貴之, 小久保 英一郎, 和田 桂一, 富阪 幸治, 牧野 淳一郎, 岡本 崇, 台坂 博, 吉 田 直紀
Organizer
日本天文学会2007年秋季年会
Place of Presentation
岐阜大学
Year and Date
20070900
Description
「研究成果報告書概要(和文)」より
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[Presentation] 銀河形成の未開拓問題2007
Author(s)
吉田 直紀
Organizer
理論天文学宇宙物理学懇談会シンポジウム
Place of Presentation
京都大学
Year and Date
2007-12-24
Description
「研究成果報告書概要(和文)」より
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[Presentation] 天の川創成プロジェクト2006
Author(s)
和田 桂一
Organizer
計算科学の戦略と次世代スーパーコンピュータ
Place of Presentation
筑波国際会議場
Year and Date
20060404-05
Description
「研究成果報告書概要(和文)」より
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[Presentation] 天の川創成プロジェクトIV壱号機の開発と性能報告2006
Author(s)
斎藤 貴之, 台坂 博, 出田 誠, 岡本 崇, 小久保 英一郎, 和田 桂一, 富阪 幸治, 牧野 淳一郎, 吉田 直紀
Organizer
日本天文学会2006年秋季年会
Place of Presentation
九州国際大学
Year and Date
2006-09-21
Description
「研究成果報告書概要(和文)」より
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[Presentation] 天の川創成プロジェクト2006
Author(s)
斎藤 貴之, 台坂 博, 出田 誠, 岡本 崇, 小久保 英一郎, 和田 桂一, 富阪 幸治, 牧野 淳一郎, 吉田 直紀
Organizer
日本流体学会年会2006
Place of Presentation
九州大学
Year and Date
2006-09-17
Description
「研究成果報告書概要(和文)」より
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[Presentation] Formation of primordial stars2006
Author(s)
N. Yoshida
Organizer
The First Stars and Evolution of the Early Universe
Place of Presentation
University of Washington, Seattle, USA
Year and Date
2006-07-05
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 地球型惑星の自転2006
Author(s)
小久保 英一郎, 井田 茂
Organizer
日本天文学会
Place of Presentation
和歌山
Year and Date
2006-03-29
Description
「研究成果報告書概要(和文)」より
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[Presentation] A Massive Black Hole and Nuclear Star Burst2005
Author(s)
Hidenori Matsui, Asao Habe, Takayuki.R.Saitoh
Organizer
1st International workshop on Astrophysics & Topology-Understanding circumsteller disk physics through numerical simulations-
Place of Presentation
北海道大学
Year and Date
20050900
Description
「研究成果報告書概要(和文)」より
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[Presentation] A Massive Black Hole and Nuclear Star Burst2005
Author(s)
Hidenori Matsui, Asao Habe, Takayuki. R. Saitoh
Organizer
1st International workshop on Astrophysics, Topology-Understanding circumsteller disk physics through numerical simulations
Place of Presentation
Hokkaido University
Year and Date
20050900
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 天の川創成プロジェクト零号機の開発II2005
Author(s)
斎藤 貴之, 台坂 博, 出田 誠, 小久保 英一郎, 和田 桂一, 富阪 幸治, 牧野 淳一郎, 吉田 直紀
Organizer
日本天文学会2005年秋季年会
Place of Presentation
札幌コンベンションセンター,北海道
Year and Date
2005-10-08
Description
「研究成果報告書概要(和文)」より
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[Book] シミュレーション天文学2007
Author(s)
富阪 幸治, 花輪 知幸, 牧野 淳一郎編著
Total Pages
324
Publisher
日本評論社
Description
「研究成果報告書概要(和文)」より
