PRIOR EMISSION MODEL FOR X-RAY PLATEAU PHASE OF GAMMA-RAY BURST AFTERGLOWS
PRIOR EMISSION MODEL FOR X-RAY PLATEAU PHASE OF GAMMA-RAY BURST AFTERGLOWS
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DOI：
10.1088/0004-637x/690/2/l118
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
R. Yamazaki
中科院分区：
文献类型：
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作者：
R. Yamazaki
提出了解释伽马射线暴(GRBs)X射线余辉平台相的双组分发射模型。负责X射线余辉的平台期和随后的正常衰变阶段的一个成分是通过主爆之前从中央引擎喷出的流出的先前发射。另一种是主流出，它导致伽玛暴的快速发射和X射线余辉的初始陡峭衰变阶段。在这个模型中，从平台期到随后的正常衰变阶段的过渡是时间零点选择的伪像。对于平台期明显的事件，在S主力出流启动前，中央引擎处于10~3-10~4活跃状态。根据该模型，在伽玛暴爆发之前，可能会在X射线和/或光学波段10 3-10 4个波段看到先期发射，这将由近期的全天X射线图像监视器(MAXI)、伽玛暴早期计时广视场望远镜(WIDGET)等仪器进行测试。
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 103–104 s before the launch of the main outflow. According to this model, a prior emission in the X-ray and/or optical bands 103–104 s 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.