THEORETICAL STUDIES ON HIGH ENERGY ASTROPHYSICS

高能天体物理理论研究

• 批准号: 13440061
• 负责人: TAKAHARA Fumio
• 金额: $ 3.14万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440061/
• 关键词: accretion disks; relativistic jets; gamma ray bursts; active galaxies; particle acceleration; black holes; clusters of galaxies; astrophysical plasmas

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.

在该项目的三年期间，每个成员都对个人主题进行了研究，并发表了许多论文。每年举行一次研究会议，以增强对常见概念和物理过程以及各种高能天体物理对象之间相互关系的相互了解。主要成就如下：1。磁场中的磁场的作用已通过大规模数值模拟研究。它们在撞击黑洞时的行为以及对X射线发射时间变化的影响。还提出了制造磁性塔的可能性。2。通过辐射流体动力学的蒙特卡洛模拟对相对论喷射的形成的Wien火球模型进行了定量研究。还基于多频观测数据对喷气机的物理状态进行分析3。发现在SNR SN1006和RXJ1713.7中发生颗粒加速度的区域的空间大小非常小，并且在扩散加速度上的限制很强。通过使用微观电场结构与无碰撞冲击相关的微观电场结构的浏览机制通过数值模拟阐明了电子加速过程。

项目成果

Yamazaki, Ryo: "X-Ray Flashes from Off-Axis Gamma-Ray Bursts"The Astrophysical Journal. 571 1. L31-L35 (2002)

山崎亮：“离轴伽马射线爆发产生的 X 射线闪光”《天体物理学杂志》。

Takahashi, R.: "Microlens of Bright Quasars"PASJ. 53. 387-393 (2001)

Takahashi, R.：“明亮类星体的微透镜”PASJ。

S.Nagataki: "Explosive Nucleosynthesis Associated with Formation of Jet-induced Gamma-Ray Bursts in Mass"Astrophysical Journal. 596. 401-413 (2003)

S.Nagataki：“与喷射引起的伽马射线爆发相关的爆炸性核合成”天体物理学杂志。

S.Iwamoto: "Wien Fireball Model of Relativistic Outflows in Active Galactic Nuclei"Astrophysical Journal. 601. 78-89 (2004)

S.Iwamoto：“活动星系核相对论流出的维恩火球模型”天体物理学杂志。

Watarai, K.: "Slim Disk : Viscosity Prescriptions and Observational Implications"PASJ. 53. 915-921 (2001)

Watarai, K.：“细盘：粘度处方和观察意义”PASJ。