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arXiv 1604.06360astro-ph.HE
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星风和轨道运动对高质量微类星体喷流的影响

The effects of the stellar wind and orbital motion on the jets of high-mass microquasars

V. Bosch-Ramon, M. V. Barkov

摘要:

高质量微类星体喷流在伴星风和双星轨道运动的影响下传播。星风和轨道可能是决定双星尺度以外喷流性质的主要因素。分析研究了星风和轨道运动对喷流特性的影响。占风推力转移到喷流,我们得到的分析估计,以表征喷流演化的恒星风的影响下。我们包括科里奥利力效应,引起的轨道运动和增强的风的存在。大规模的演变的喷气素描占风喷气推力转移,总能量守恒,和风射流混合。如果由风引起的射流弯曲的角度大于其半张开角,则预计会出现以下情况:(i)强烈的平行激波;(ii)由科里奥利力引起并因风的存在而增强的逆轨道运动的弯曲;以及(iii)更远的非弹道螺旋传播。即使受到干扰,射流也可以由于环境压力梯度而重新加速,但风的夹带可以削弱这种加速。在大尺度上,螺旋结构的张开角由风-喷流推力关系决定,风载喷流可以相当缓慢。恒星风对高质量微类星体喷流的影响可以产生非弹道螺旋喷流轨迹,喷流部分破裂和风混合,冲击和可能的非热发射。在不同波段的几个观测诊断中,毫角秒尺度上的射电形态学对于风-喷流相互作用特别有见地。

英文摘要:

High-mass microquasar jets propagate under the effect of the wind from the companion star, and the orbital motion of the binary system. The stellar wind and the orbit may be dominant factors determining the jet properties beyond the binary scales.} An analytical study is performed to characterize the effects of the stellar wind and the orbital motion on the jet properties. Accounting for the wind thrust transferred to the jet, we derive analytical estimates to characterize the jet evolution under the impact of the stellar wind. We include the Coriolis force effect, induced by orbital motion and enhanced by the wind presence. Large-scale evolution of the jet is sketched accounting for wind-to-jet thrust transfer, total energy conservation, and wind-jet flow mixing. If the angle of the wind-induced jet bending is larger than its half-opening angle, the following is expected: (i) a strong recollimation shock; (ii) bending against orbital motion, caused by Coriolis forces and enhanced by the wind presence; and (iii) non-ballistic helical propagation further away. Even if disrupted, the jet can reaccelerate due to ambient pressure gradients, but wind entrainment can weaken this acceleration. On large scales, the opening angle of the helical structure is determined by the wind-jet thrust relation, and the wind-loaded jet flow can be rather slow. The impact of stellar winds on high-mass microquasar jets can yield non-ballistic helical jet trajectories, jet partial disruption and wind mixing, shocks, and possibly non-thermal emission. Among several observational diagnostics at different bands, the radio morphology on milliarcsecond scales can be particularly insightful regarding the wind-jet interaction.

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