论文标题
伽马射线爆发X射线发射线的未检测：下降效应
Non-detection of the Gamma-ray Burst X-ray Emission Line: The Down-Comptonization Effect
论文作者
论文摘要
检测伽马射线爆发（GRB）X射线发射线对于研究GRB物理学和限制GRB红移很重要。由于1999年首次报道了GRB X射线频谱中的线状功能，因此在过去的二十年中，已经发表了几项正在搜索的作品。即使对X射线线样特征进行了一些观察，迄今为止，显着性仍然存在争议。在本文中，我们利用了倾斜机制，并介绍了GRB中央发动机附近发射的Fe K $α$线的时间演变。线强度随进化时间的降低，时间演变取决于电子密度和电子温度。此外，随着时间的推移，宽扩展的初始线减少降低。例如，当排放线以高于$ 10^{12} $ cm $ $^{ - 3} $的电子密度在1 keV处渗透材料时，通常在100 s后它变得不够重要，以至于无法检测到它。线状轮廓偏离高斯形式，最终变化为在线光子和周围材料之间的热平衡时类似于黑体形状。
The detection of the gamma-ray burst (GRB) X-ray emission line is important for studying the GRB physics and constraining the GRB redshift. Since the line-like feature in the GRB X-ray spectrum was first reported in 1999, several works on line searching have been published over the past two decades. Even though some observations on the X-ray line-like feature were performed, the significance remains controversial to date. In this paper, we utilize the down-Comptonization mechanism and present the time evolution of the Fe K$α$ line emitted near the GRB central engine. The line intensity decreases with the evolution time, and the time evolution depends on the the electron density and the electron temperature. In addition, the initial line with a larger broadening decreases less over time. For instance, when the emission line penetrates material with the an electron density above $10^{12}$ cm$^{-3}$ at 1 keV, it generally becomes insignificant enough after 100 s for it not to be detected. The line-like profile deviates from the Gaussian form, and it finally changes to be similar to a blackbody shape at the time of the thermal equilibrium between the line photons and the surrounding material.
