论文标题
tens的风环境和洛伦兹因素解释了伽马射线爆发X射线高原
A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau
论文作者
论文摘要
已知伽马射线爆发（GRB）具有最相对论的喷气机，其初始洛伦兹因子以数百个为单位。许多GRB都表现出早期的X射线光曲线高原，从理论上讲，这不是预期的，因此多年来使社区感到困惑。在这里，我们表明该观察到的信号自然是在经典的GRB“火球”模型中获得的，前提是初始Lorentz因子相当数十个，并且扩展变成中低密度的“风”。因此，GRB喷气机中Lorentz因子的范围比以前认为的宽大，并且在活动的银河系核中推断出的轻度相对论喷气机之间存在观察差距，以与少数极端GRB中的高度相对论性喷射。此外，长GRB祖细胞要么不是狼射线星，要么在最后的恒星演化阶段的风质与早期不同。我们讨论了该模型的几个可测试预测。
Gamma-ray bursts (GRBs) are known to have the most relativistic jets, with initial Lorentz factors in the order of a few hundreds. Many GRBs display an early X-ray light-curve plateau, which was not theoretically expected and therefore puzzled the community for many years. Here, we show that this observed signal is naturally obtained within the classical GRB "fireball" model, provided that the initial Lorentz factor is rather a few tens, and the expansion occurs into a medium-low density "wind". The range of Lorentz factors in GRB jets is thus much wider than previously thought and bridges an observational gap between mildly relativistic jets inferred in active galactic nuclei, to highly relativistic jets deduced in few extreme GRBs. Furthermore, long GRB progenitors are either not Wolf-Rayet stars, or the wind properties during the final stellar evolution phase are different than at earlier times. We discuss several testable predictions of this model.
