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arXiv 0809.5197astro-ph
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脉冲星与星风相互作用的流体动力学及其对脉冲双星系统高能辐射的影响

Hydrodynamics of interaction of pulsar and stellar winds and its impact on the high energy radiation of binary pulsar systems

D. V. Khangulyan, F. A. Aharonian, S. V. Bogovalov, A. V. Koldoba, G. V. Ustyugova

摘要:

讨论了双星系统中脉冲星与星风相互作用的流体动力学及其对脉冲星PSR B1259-63/SS 2883非热辐射的影响。超相对论脉冲星风与非相对论恒星外流的碰撞导致脉冲星风中受冲击物质的大量加速。在距离与双星系统大小相当的情况下,激波流的洛伦兹因子可以大到$γ$ ~4。这导致加速电子的逆康普顿辐射的显著各向异性。由于所产生的辐射的多普勒增强,人们应该期望从系统中得到可变的伽马射线信号。特别是,这种效应可以很自然地解释报告的TeV伽马射线通量减少的趋势接近近星点。脉冲星和恒星风的相互作用的建模允许绝热损失的自洽计算。我们的结果表明,绝热损失占主导地位的辐射损失。这些结果对脉冲双星PSR 1259-63/SS 2883的射电、X射线和γ射线信号的轨道变化有直接影响。

英文摘要:

The hydrodynamics of the interaction of pulsar and stellar winds in binary systems harboring a pulsar and its impact on the nonthermal radiation of the binary pulsar PSR B1259-63/SS2883 is discussed. The collision of an ultrarelativistic pulsar wind with a nonrelativistic stellar outflow results in significant bulk acceleration of the shocked material from the pulsar wind. Already at distances comparable to the size of the binary system, the Lorentz factor of the shocked flow can be as large as $γ$~4. This results in significant anisotropy of the inverse Compton radiation of accelerated electrons. Because of the Doppler boosting of the produced radiation, one should expect a variable gamma-ray signal from the system. In particular, this effect may naturally explain the reported tendency of a decrease of TeV gamma-ray flux close to the periastron. The modeling of the interaction of pulsar and stellar winds allows self-consistent calculations of adiabatic losses. Our results show that adiabatic losses dominate over the radiative losses. These results have direct impact on the orbital variability of radio, X-ray and gamma-ray signals detected from the binary pulsar PSR 1259-63/SS2883.

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