2003 Fiscal Year Final Research Report Summary
THEORETICAL STUDIES ON HIGH ENERGY ASTROPHYSICS
| Project/Area Number |
13440061
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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 | Osaka University |
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Principal Investigator |
TAKAHARA Fumio OSAKA UNIVERSITY, GRADUATE SCHOOL OF SCIENCES, PROFESSOR, 大学院・理学研究科, 教授 (20154891)
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| Co-Investigator(Kenkyū-buntansha) |
MASAI Kuniaki TOKYO METROPLOLITAN UNIVERCITY, GRADUATE SCHOOL OF SCIENCE, ASSOCIATE PROFESSOR, 理学研究科, 教授 (80181626)
SHIBATA Shinpei YAMAGATA UNIVERSITY, FACULTY OF SCIENCE, PROFESSOR, 理学部, 教授 (90187401)
MINESHIGE Shin KYOTO UNIVERSITY, YUKAWA INSTITUTE, PROFESSOR, 基礎物理学研究所, 教授 (70229780)
KUSUNOSE Masaaki KWANSEI GAKUIN UNIVERSITY, FACULTY OF SCIENCE.TECH., PROFESSOR, 理工学部, 教授 (40211883)
HOSHINO Masahiro UNIVERSITY OF TOKYO, GRADUATE SCHOOL OF SCIENCE, PROFESSOR, 理学系研究科, 教授 (90241257)
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| Project Period (FY) |
2001 – 2003
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| Keywords | accretion disks / relativistic jets / gamma ray bursts / active galaxies / particle acceleration / black holes / clusters of galaxies / astrophysical plasmas |
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| Research Abstract |
During the three year term of this project, each member has done research on individual subjects and published many papers. For each year a research meeting was held to boost mutual understanding of common concepts and physical processes, and interrelations among various high-energy astrophysical objects. Major achievements are as follows :
1. The role of magnetic fields in. accretion disks has been investigated through large scale numerical simulations. Their behavior in impinging into the black hole and effect on time variations in X-ray emission was clarified. A possibility of making a magnetic tower was also suggested.
2. The Wien fireball model for the formation of relativistic jets was quantitatively investigated through the Monte Carlo simulation of radiation hydrodynamics. Analysis of the physical state of jets was also made based on multi-frequency observational data.
3. The spatial size of the region where particle acceleration is occurring in SNR SN1006 and RXJ1713.7 was found to be extremely small and strong constraints on diffusive acceleration were obtained. Electron acceleration process through surfing mechanism utilizing microscopic electric field structure associated with collisionless shocks was clarified through numerical simulation.
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