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Construction of Hybrid Model for Astrophysical Jets

天体物理喷流混合模型的构建

基本信息

批准号：
15540235
负责人：
FUKUE Jun
金额：
$ 1.66万
依托单位：
Osaka Kyoiku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540235/
关键词：
astrophysical jets accretion disks black holes X-ray binary active galactic nuclei microquasar SS433 relativistic astrophysics radiation hydrodynamics

项目摘要

FY2003We constructed a steady jet model emanating from a geometrically thin disk, taking into account the gas, radiation, and magnetic pressures. We have found that the jet flow generally have multiple critical (transonic) points, since the gravitational and radiative forces along the streamline do not monotonic.As a result, the jet flow is accelerated by passing through the saddle type critical point to be supersonic.We also obtained an approximate empirical formula for the terminal speed of jet flows.FY2004We examined on-axis jets of supercritical accretion disks, where the mass-accretion rate highly exceeds the Eddington accretion rate. The jet gas suffers from the gravity of the central object, the radiative flux from the disk, and the radiation drag force of the intense radiation fields of the disk.We have calculated the equilibrium speed as well as the terminal one for on-axis jets.We also found a useful expression between the terminal speed and the disk luminosity.FY2005We carefully examined the relativistic radiative flow from a luminous disk under a fully special relativistic treatment. The flow is assumed to be vertical, and the gravity, the gas pressure, and the viscous heating are ignored. The radiatively-driven flow in a luminous disk is numerically solved, from the flow base (disk "inside") to the flow top. For a given optical depth and appropriate initial conditions at the flow base, where the flow starts, a loaded mass in the flow is obtained as an eigenvalue of the boundary condition at the flow top. Moreover, the flow velocity and radiation fields along the flow are obtained as a function of the optical depth.

FY2003考虑气体压力、辐射压力和磁压力，我们建立了一个从几何薄圆盘中发出的定常喷流模型。我们已经发现，射流一般具有多个临界（跨音速）点，因为重力和辐射力沿着流线不是单调的。结果，射流通过鞍型临界点被加速到超音速。我们还得到了射流终端速度的近似经验公式。FY2004我们研究了超临界吸积盘的轴向射流，那里的质量吸积率大大超过爱丁顿吸积率。喷射气体受到中心物体的重力，来自圆盘的辐射通量，以及圆盘强辐射场的辐射拖曳力，计算了圆盘的平衡速度和终端速度。FY2005我们仔细地研究了在一个完全对称的条件下，来自一个发光圆盘的相对论辐射流，特殊相对论处理流动被假定为垂直的，并且忽略重力、气体压力和粘性加热。数值求解了发光圆盘中从流动底部（圆盘“内部”）到流动顶部的辐射驱动流动。对于一个给定的光学深度和适当的初始条件，在流动的底部，在流动开始，在流中的负载质量获得作为在流动顶部的边界条件的特征值。此外，流速和辐射场沿着流获得作为光学深度的函数。