首页> 外文OA文献 >On the nature of late X-ray flares in Swift gamma-ray bursts
【2h】

On the nature of late X-ray flares in Swift gamma-ray bursts

机译:关于Swift伽马射线暴中晚期X射线耀斑的性质

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Context. Previously detected in only a few gamma-ray bursts (GRBs), X-ray flares are now observed in similar to 50% of Swift GRBs, though their origins remain unclear. Most flares are seen early on in the afterglow decay, while some bursts exhibit flares at late times of 10(4) to 10(5) s, which may have implications for flare models. Aims. We investigate whether a sample of late time (greater than or similar to 1 x 10(4) s) flares are different from previous samples of early time flares, or whether they are merely examples on the tail of the early flare distribution. Methods. We examine the X-ray light curves of Swift bursts for late flares and compare the flare and underlying temporal power-law properties with those of early flares, and the values of these properties predicted by the blast wave model. Results. The burst sample shows late flare properties consistent with those of early flares, where the majority of the flares can be explained by either internal or external shock, though in a few cases one origin is favoured over the other. The underlying power-laws are mainly consistent with the normal decay phases of the afterglow. Conclusions. If confirmed by the ever growing sample of late time flares, this would imply that, in some cases, prolonged activity out to a day or a restarting of the central engine is required.
机译:上下文。以前仅在少数伽马射线暴(GRB)中检测到,现在在50%的Swift GRB中观察到X射线耀斑,尽管其起源尚不清楚。大多数耀斑在余辉衰减的早期出现,而某些爆发在10(4)到10(5)s的后期显示耀斑,这可能对耀斑模型有影响。目的我们研究了后期耀斑(大于或类似于1 x 10(4)s)的样本是否与以前的早期耀斑样本不同,或者它们仅仅是早期耀斑分布尾部的示例。方法。我们检查了后期爆发的斯威夫特爆发的X射线光曲线,并比较了早期爆发的爆发和潜在的时间幂律特性,以及由爆炸波模型预测的这些特性的值。结果。爆裂样品显示出后期火炬的特性与早期火炬的特性相一致,在这种情况下,大多数火炬可以通过内部或外部冲击来解释,尽管在少数情况下,一个来源比另一个来源更受青睐。基本的幂律主要与余辉的正常衰减阶段一致。结论。如果被越来越多的后期耀斑样本所证实,则这意味着在某些情况下,需要将活动延长至一天或需要重新启动中央引擎。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号