Theoretical Study of the Internal Structures of the Relativistic Jets

相对论性喷流内部结构的理论研究

• 批准号: 18540239
• 负责人: TAKAHARA Fumio
• 金额: $ 1.52万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18540239/
• 关键词: Radio Galaxies; Relativistic Jets; Synchrotron Radiation; Polarization; Particle Acceleration; Quasars; Collisionless Shock; Plasma Instabilities; コンプトン散乱

(1) We proposed a model in which inhomogeneities in the jet cause light echoes accompanying primary flares, which may explain orphan TeV flares observed for several TeV blazers.(2) Apparent structures of relativistic jets depend complicatedly on the lateral and transverse structure and on the way of time variation because the difference between the matter velocities and light propagation velocity is very small. We showed that observed spatial offsets among X-ray, optical and radio peaks can be explained by energy dependent cooling time of accelerated electrons in a propagating emitting blob.(3) Effects of the relativistic aberration and beaming on the polarization structure are analyzed. We clarified that the observed polarization angle is perpendicular to the magnetic field direction on the sky plane in the comoving frame. Based on this we studied statistical properties of the polarization angle distribution. The magnetic field turns out to be predominantly directed in the transverse direction in the comoving frame. We also studied polarization properties of perturbed helical field geometry.(4) Electron acceleration process for collisionless shocks are investigated. We showed that contrary to the one-dimensional case, no surfing acceleration occurs for two-dimensional case. Plasma instabilities in the existence of ion beams are also considered for two-dimensional case and ion two-stream instability turns out to be the most unstable mode.(5) Two relativistic fluids in a relative motion are considered and energy and momentum exchange rates between them are calculated and interpolation formulas were proposed. Using them we performed numerical simulations of the formation of jets.

(1) We proposed a model in which inhomogeneities in the jet cause light echoes accompanying primary flares, which may explain orphan TeV flares observed for several TeV blazers.(2) Apparent structures of relativistic jets depend complicatedly on the lateral and transverse structure and on the way of time variation because the difference between the matter velocities and light propagation velocity is very small.我们表明，在X射线，光学峰和无线电峰之间观察到的空间偏移可以通过在传播发射斑点中加速电子的能量依赖的冷却时间来解释。（3）分析相对论异常和光束对极化结构的影响。我们澄清说，观察到的极化角垂直于共旋转框架的天空平面上的磁场方向。基于此，我们研究了极化角度分布的统计特性。事实证明，磁场主要针对共同框架的横向。我们还研究了扰动螺旋场几何形状的极化特性。（4）研究了无碰撞冲击的电子加速过程。我们表明，与一维情况相反，二维情况没有出现冲浪加速度。对于二维病例，还考虑了离子束存在中的血浆不稳定性，而离子的两流不稳定性被证明是最不稳定的模式。（5）考虑了相对运动中的两个相对论流体，并提出了它们之间的能量和动量汇率，并提出了它们之间的互换率。我们使用它们进行了数值模拟，以模拟喷气机的形成。

项目成果

Generation of a Fireball in AGN Hot Plasmas

• DOI: 10.1086/509756
• 发表时间: 2006-11
• 期刊: The Astrophysical Journal
• 作者: K. Asano;F. Takahara

Absence of electron surfing acceleration in a two-dimensional simulation

二维模拟中没有电子冲浪加速

• 发表时间: 2007
• 期刊: Astrophysical Journal 661
• 作者: Nagashima;Kaori;Isobe;Hiroaki;Yokoyama;Takaaki;Ishii;Takako T.;Okamoto;Takenori J.;Shibata;Kazunari;Y. Ohira
• 通讯作者: Y. Ohira

TeV Y-rays from old supernova remnants

来自古老超新星遗迹的 TeV Y 射线

• 发表时间: 2006
• 期刊: Monthly Notices of the Royal Astronomical Society 371
• 作者: Katsukawa;et. al.;R. Yamazaki
• 通讯作者: R. Yamazaki

Energy and Momentum Transfer via Coulomb Frictions in Relativistic Two Fluids

相对论性两种流体中通过库仑摩擦的能量和动量传递

• 发表时间: 2007
• 期刊: Astrophysical Journal Supplement Series 168
• 作者: Notoya;S.;Yokoyama;T.;Kusano;K.;Sakurai;T.;Miyagoshi;T.;Isobe;H.;Yamamoto;T.;K. Asano
• 通讯作者: K. Asano

A Structured Leptonic Jet Model of the "Orphan" TeV Gamma-Ray Flares in TeV Blazars

TeV 耀变体中“孤儿”TeV 伽马射线耀斑的结构化轻子射流模型

• 发表时间: 2006
• 期刊: Astrophysical Journal 651
• 作者: Nagashima;et. al.;M. Kusunose
• 通讯作者: M. Kusunose