The 2.35 year itch of Cygnus OB2 #9 - III. X-ray and radio emission analysis based on 3D hydrodynamical modelling
The 2.35 year itch of Cygnus OB2 #9 - III. X-ray and radio emission analysis based on 3D hydrodynamical modelling
复制标题
天鹅座OB2的2.35年之痒
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
R. Blomme
中科院分区：
文献类型：
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作者：
E. Parkin;J. Pittard;Y. Nazé;R. Blomme
上下文。大质量双星系统中的风-风碰撞导致高温激波的产生，这些激波以x射线波长发射，如果粒子加速有效，可能会表现出非热射电发射。天鹅座OB2#9是本系列中为数不多的大质量双星系统之一。目标。作为研究Cyg OB2#9项目的一部分，最近获得的x射线和无线电数据用于约束双星系统的物理模型，提供有关风-风碰撞以及冲击产生的热发射和非热发射的深入知识。方法。我们使用3D，自适应网格细化模拟（包括风加速，辐射冷却和恒星的轨道运动）来模拟风-风碰撞的气体动力学。将模拟输出作为考虑热x射线发射和热/非热射电发射的辐射传输计算的基础。结果。模拟中的流动动力学表明，（恒星之间的）风加速度在所有轨道阶段都受到对方恒星辐射场的抑制，从而降低了激波前的速度，使其低于终端速度。为了获得与x光片良好的一致性，
Context. The wind-wind collision in a massive star binary system leads to the generation of high temperature shocks that emit at X-ray wavelengths and, if particle acceleration is effective, may exhibit non-thermal radio emission. Cyg OB2#9 is one of a small number of massive star binary systems in this class. Aims. X-ray and radio data recently acquired as part of a project to study Cyg OB2#9 are used to constrain physical models of the binary system, providing in-depth knowledge about the wind-wind collision and the thermal, and non-thermal, emission arising from the shocks. Methods. We use a 3D, adaptive mesh refinement simulation (including wind acceleration, radiative cooling, and the orbital motion of the stars) to model the gas dynamics of the wind-wind collision. The simulation output is used as the basis for radiative transfer calculations considering the thermal X-ray emission and the thermal/non-thermal radio emission. Results. The flow dynamics in the simulation show that wind acceleration (between the stars) is inhibited at all orbital phases by the opposing star’s radiation field, reducing pre-shock velocities below terminal velocities. To obtain good agreement with the X-ray ,