论文标题
光谱演变负责从γ射线爆发中从正滞后到负滞后的过渡
Spectral evolution responsible for the transition from positive lags to negative lags in Gamma-ray Bursts
论文作者
论文摘要
众所周知，大多数伽马射线爆发（GRB）以正频谱滞后为主，而一小部分GRB则显示出负滞后。但是，Wei等人。首先确定了从正面滞后到GRB 160625B中的负滞后的明确定义的过渡，然后根据观察结果对洛伦兹不变性（LIV）的可能侵犯受到了强大的限制。最近，Gunapati等人在\ thisgrb的三个不同发射发作中发现了这种过渡，这为我们提供了一个很好的机会，可以研究LIV诱导的观察到的光谱滞后是否引起过渡。我们的分析表明，LIV模型不能与当前的观测值兼容，而仅光谱演化引起的光谱滞后才能负责过渡。因此，光谱演化还可以解释GRB 190530a中的负滞后。
It was well known that most of gamma-ray bursts (GRBs) are dominated by positive spectral lags, while a small fraction of GRBs show negative lags. However, Wei et al. firstly identified a well-defined transition from positive lags to negative lags in GRB 160625B, and then got robust limits on possible violation of Lorentz Invariance (LIV) based on the observation. Recently, such a transition has been found in three different emission episodes in \thisgrb by Gunapati et al., which provides us a great opportunity to investigate whether the transition results from LIV-induced observed spectral lags. Our analysis shows that the LIV model can not be compatible with the current observations, whereas, only the spectral evolution induced spectral lags could responsible for the transition. So, spectral evolution can also explain the positive to negative lag in GRB 190530A.
