A novel explosive process is required for the γ-ray burst GRB 060614
A novel explosive process is required for the γ-ray burst GRB 060614
复制标题
DOI：
10.1038/nature05373
复制
发表时间：
2006-12-21
期刊：
影响因子：
64.8
通讯作者：
MacFadyen, A. I.
中科院分区：
文献类型：
--
作者：
Gal-Yam, A.;Fox, D. B.;MacFadyen, A. I.
在过去的十年里，我们对伽马射线暴(GRB)的物理理解取得了迅速的进展，这要归功于对它们长寿命余辉发射的发现和观察。长持续时间(大于或类似于S 2)的伽玛暴与大质量恒星的爆炸性死亡(‘崩塌星’)有关。1)，产生伴生超新星(2-5)；短持续时间(小于或类似于2个S)伽玛暴有不同的起源，被认为是两个致密天体(6-9)的合并。本文报道了伽玛暴060614的光学观测结果。10)这排除了相关超新星的存在。这似乎需要一个新的爆炸性过程：要么是一个没有任何相关超新星的大质量坍塌星为伽玛暴提供动力，要么是一种新型的“引擎”，它的寿命与坍塌星一样长，但没有大质量恒星。我们还表明，宿主星系(红移z=0.125)的性质使其有别于其他长时间的伽玛暴主机，并表明可能需要一种全新类型的伽玛暴前身。
Over the past decade, our physical understanding of gamma-ray bursts (GRBs) has progressed rapidly, thanks to the discovery and observation of their long-lived afterglow emission. Long-duration (greater than or similar to 2 s) GRBs are associated with the explosive deaths of massive stars ('collapsars', ref. 1), which produce accompanying supernovae(2-5); the short- duration (less than or similar to 2 s) GRBs have a different origin, which has been argued to be the merger of two compact objects(6-9). Here we report optical observations of GRB 060614 (duration 100 s, ref. 10) that rule out the presence of an associated supernova. This would seem to require a new explosive process: either a massive collapsar that powers a GRB without any associated supernova, or a new type of 'engine', as long-lived as the collapsar but without a massive star. We also show that the properties of the host galaxy (redshift z = 0.125) distinguish it from other long-duration GRB hosts and suggest that an entirely new type of GRB progenitor may be required.