论文标题
磁层磁层中快速无线电爆发波的透明度
Transparency of Fast Radio Burst Waves in Magnetar Magnetospheres
论文作者
论文摘要
至少有一些快速的无线电爆发（FRB）是由磁铁产生的。尽管安装的观察证据表明FRB发射的磁层起源，但FRB产生位置的问题仍在争论中。一个论点建议针对明亮的FRB的磁层起源，是在逃脱磁层之前，与FRB相关的无线电波可能会损失大部分能量，因为在存在强磁场的情况下，$ e^\ pm $的横截面散布了大振幅EM波，比汤普森横截面大得多。我们已经调查了这一建议，并发现穿过磁层磁层的开放田线区域的FRB辐射并没有损失太多，这是两个先前被忽略的因素。首先，外部磁层中的血浆（$ r \ gta 10^9 \ $ cm），其中损失可能最严重，很可能以高洛伦兹因子$γ_p\ geq 10^3 $向外流出。其次，在外部磁层中，波矢量和磁场矢量之间的角度$θ_b$可能是由于强烈的FRB脉冲倾斜开放的磁场线，因此它们与脉冲宣传方向保持一致。这两种影响都大大降低了FRB脉冲和血浆之间的相互作用。我们发现，具有各向同性亮度的明亮FRB $ l _ {\ rm frb} \ gta 10^{42} \ {\ rm Erg \ s^{ - 1}} $可以逃脱磁层，从而无法逃脱磁层，从而毫无疑问地构成了$γ_p-umpisters的大量席位。这个测试。
At least some fast radio bursts (FRBs) are produced by magnetars. Even though mounting observational evidence points towards a magnetospheric origin of FRB emission, the question of the location for FRB generation continues to be debated. One argument suggested against the magnetospheric origin of bright FRBs is that the radio waves associated with an FRB may lose most of their energy before escaping the magnetosphere because the cross-section for $e^\pm$ to scatter large-amplitude EM waves in the presence of a strong magnetic field is much larger than the Thompson cross-section. We have investigated this suggestion and find that FRB radiation traveling through the open field line region of a magnetar's magnetosphere does not suffer much loss due to two previously ignored factors. First, the plasma in the outer magnetosphere ($r \gta 10^9 \ $cm), where the losses are potentially most severe, is likely to be flowing outward at a high Lorentz factor $γ_p \geq 10^3$. Second, the angle between the wave vector and the magnetic field vector, $θ_B$, in the outer magnetosphere is likely of the order of 0.1 radian or smaller due in part to the intense FRB pulse that tilts open magnetic field lines so that they get aligned with the pulse propagation direction. Both these effects reduce the interaction between the FRB pulse and the plasma substantially. We find that a bright FRB with an isotropic luminosity $L_{\rm frb} \gta 10^{42} \ {\rm erg \ s^{-1}}$ can escape the magnetosphere unscathed for a large section of the $γ_p-θ_B$ parameter space, and therefore conclude that the generation of FRBs in magnetar magnetosphere passes this test.
