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arXiv 0810.1089astro-ph
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伽马射线暴余辉X射线平台相的先验发射模型

Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst Afterglows

Ryo Yamazaki

摘要:

提出了解释伽马射线暴(GRB)的X射线余辉平台相的双分量发射模型。其中一个成分是在主爆发之前通过从中心发动机喷出的流出物的先前发射,它负责X射线余辉的平台和随后的正常衰变阶段。另一个是主要的外流,它导致了伽玛暴的瞬发和X射线余辉的初始陡衰减相。在这个模型中,从平台到随后的正常衰变阶段的过渡是时间零点选择的人为因素。对于具有明显平台阶段的事件,中央引擎在主外流发射前10^3-10^4秒处于活动状态。根据这一模型,在伽玛暴瞬发前10^3-10^4秒,可能出现X射线和/或光学波段的先行辐射,这一现象有待于全天空X射线图像监测仪(MAXI)、WIDGET等仪器的检验。

英文摘要:

The two-component emission model to explain the plateau phase of the X-ray afterglows of gamma-ray bursts (GRBs) is proposed. One component, which is responsible for the plateau and subsequent normal decay phase of the X-ray afterglow, is the prior emission via outflow ejected from the central engine before the main burst. The other is the main outflow, which causes the prompt GRB emission and the initial steep decay phase of the X-ray afterglow. In this model, the transition from the plateau to the subsequent normal decay phase is an artifact of the choice of the zero of time. For events with distinct plateau phase, the central engine is active 10^3-10^4 sec before the launch of the main outflow. According to this model, a prior emission in the X-ray and/or optical bands 10^3-10^4 sec before the prompt GRB emission is possibly seen, which will be tested by near-future instruments such as Monitor of All-sky X-ray Image (MAXI), WIDe-field telescope for GRB Early Timing (WIDGET), and so on.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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