Gamma-ray Burst High-latitude Emission: Simulating the Propagation Effect

Khadeejah Motiwala, S. Sajjad
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Abstract

Relativistic outflows in Gamma-ray Bursts (GRBs) are collimated into jets with narrow angles due to the beaming effect. In simple kinetic models, these jets are composed of relativistic, emitting shells with spherical geometry causing a propagation effect: emission that abruptly stops results in the observed flux decaying with time, rather than immediately ceasing. We study the propagation effect in isolation by generating random, uniform emission from the surface of a static shell. We consider two types of emission profiles: a single pulse of emission and emission that varies sinusoidally with time. The observed profile is seen to be delayed by a time scale that is consistent with the angular spreading time scale found in literature. In particular, we find that the presence of flux variations in the observed profile depends on the size of the emission region relative to the time scale of pulses in the emission profile.
伽玛射线暴高纬度发射:模拟传播效应
伽玛射线暴(GRBs)中的相对论性喷流由于光束效应被准直成窄角射流。在简单的动力学模型中,这些喷流是由相对论性的、具有球形几何形状的发射壳组成的,造成了一种传播效应:突然停止的发射导致观测到的通量随着时间的推移而衰减,而不是立即停止。我们通过从静态壳体表面产生随机、均匀的发射来研究隔离状态下的传播效应。我们考虑两种类型的发射曲线:单脉冲发射和随时间正弦变化的发射。观测到的剖面被一个与文献中发现的角扩散时间尺度相一致的时间尺度所延迟。特别是,我们发现观测剖面中通量变化的存在取决于相对于发射剖面中脉冲时间尺度的发射区域的大小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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