论文标题
FRB-SGR连接
The FRB-SGR Connection
论文作者
论文摘要
Galactic SGR 1935 $+$ 2154发射的FRB 200428与伽马射线耀斑同时发出的发现证明了这些现象的共同来源和关联，这一发现是发现了。如果FRB无线电发射是相干曲率辐射的结果，则可以从辐射磁场中推断出辐射“束”的净电荷，而与产生束的机制无关。统计论点表明，辐射束必须具有Lorentz因子$ \ gtrapprox 10 $。观察到的辐射频率表明它们的相速度（图案速度）对应于Lorentz因子$ \ gtrapprox 100 $。库仑排斥意味着构成这些束的电子可能具有较大的洛伦兹因子，受其不连贯的曲率辐射的限制。这些电子还散布了SGR的软伽马射线。在FRB 200428中，在无线电频率下相干辐射的功率超过了康普顿散射的功率，但是在更发光的SGR爆发中，康普顿散射占主导地位，排除了能量电子的加速度。这解释了与巨型2004年12月27日SGR 1806 $ -20爆发相关的FRB的缺失。 sgr具有光度$ \ gtrsim 10^{42} $ ergs/s/s不发出frb，而较小的光度的sgr则可以这样做。当狭义的直接frb与视线对齐时，“超级爆炸”（例如FRB 200428）会产生。它们是不寻常的，但并不罕见，“宇宙学” FRB可能是超级爆炸。
The discovery that the Galactic SGR 1935$+$2154 emitted FRB 200428 simultaneous with a gamma-ray flare demonstrated the common source and association of these phenomena. If FRB radio emission is the result of coherent curvature radiation, the net charge of the radiating "bunches" or waves may be inferred from the radiated fields, independent of the mechanism by which the bunches are produced. A statistical argument indicates that the radiating bunches must have a Lorentz factor $\gtrapprox 10$. The observed radiation frequencies indicate that their phase velocity (pattern speed) corresponds to Lorentz factors $\gtrapprox 100$. Coulomb repulsion implies that the electrons making up these bunches may have yet larger Lorentz factors, limited by their incoherent curvature radiation. These electrons also Compton scatter the soft gamma-rays of the SGR. In FRB 200428 the power radiated coherently at radio frequencies exceeded that of Compton scattering, but in more luminous SGR outbursts Compton scattering dominates, precluding the acceleration of energetic electrons. This explains the absence of a FRB associated with the giant 27 December 2004 outburst of SGR 1806$-$20. SGR with luminosity $\gtrsim 10^{42}$ ergs/s do not emit FRB, while those of lesser luminosity can do so. "Superbursts" like FRB 200428 are produced when narrowly collimated FRB are aligned with the line of sight; they are unusual, but not rare, and "cosmological" FRB may be superbursts.
