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首页> 外文期刊>The Astrophysical journal >RELATIVISTIC WINDS FROM COMPACT GAMMA-RAY SOURCES. II. PAIR LOADING AND RADIATIVE ACCELERATION IN GAMMA-RAY BURSTS
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RELATIVISTIC WINDS FROM COMPACT GAMMA-RAY SOURCES. II. PAIR LOADING AND RADIATIVE ACCELERATION IN GAMMA-RAY BURSTS

机译：紧凑型伽玛射线源带来的相对论风。二。伽马射线暴的成对载荷和辐射加速

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摘要

We consider the effects of rapid pair creation by an intense pulse of γ-rays propagating ahead of a relativistic shock. Sidescattered photons colliding with the main γ-ray beam amplify the density of scattering charges. The acceleration rate of the pair-loaded medium is calculated and its limiting bulk Lorentz factor related to the spectrum and compactness of the photon source. One obtains, as a result, a definite prediction for the relative inertia in baryons and pairs. The deceleration of a relativistic shock in the moving medium and the resulting synchrotron emissivity are compared with existing results for a static medium. The radiative efficiency is increased dramatically by pair loading. When the initial ambient density exceeds a critical value, the scattering depth traversed by the main γ-ray pulse rises above unity and the pulse is broadened. This sets an upper limit to the preburst mass-loss rate of ～10~(-5) solar mass per year and places significant constraints on γ-ray burst progenitors. An anisotropic γ-ray flux (on an angular scale Γ~(-1) or larger) drives a large velocity shear that greatly increases the energy in the seed magnetic field forward of the propagating shock.
机译：我们考虑由相对论性冲击之前传播的强烈γ射线脉冲快速建立对的影响。侧向散射光子与主γ射线束碰撞会放大散射电荷的密度。计算成对加载的介质的加速速率，其极限体积洛伦兹因子与光子源的光谱和紧密度有关。结果，获得了重子和双子对的相对惯性的确定预测。将移动介质中相对论性冲击的减速度和所得的同步加速器发射率与静态介质的现有结果进行了比较。线对负载极大地提高了辐射效率。当初始环境密度超过临界值时，由主γ射线脉冲穿过的散射深度会增加到大于1，并且脉冲会变宽。这为每年〜10〜（-5）太阳质量的爆发前质量损失率设定了上限，并对γ射线爆发祖细胞施加了明显的限制。各向异性的γ射线通量（角度尺度Γ〜（-1）或更大）会驱动较大的速度剪切，从而极大地增加了传播震动之前种子磁场中的能量。

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