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arXiv 0908.2817astro-ph.HEastro-ph.CO
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一颗未探测到伽马射线暴的Ibc型超新星

A Relativistic Type Ibc Supernova Without a Detected Gamma-ray Burst

A. M. Soderberg, S. Chakraborti, G. Pignata, R. A. Chevalier, P. Chandra, A. Ray, M. H. Wieringa, A. Copete, V. Chaplin, V. Connaughton, S. D. Barthelmy, M. F. … 展开作者

A. M. Soderberg, S. Chakraborti, G. Pignata, R. A. Chevalier, P. Chandra, A. Ray, M. H. Wieringa, A. Copete, V. Chaplin, V. Connaughton, S. D. Barthelmy, M. F. Bietenholz, N. Chugai, M. D. Stritzinger, M. Hamuy, C. Fransson, O. Fox, E. M. Levesque, J. E. Grindlay, P. Challis, R. J. Foley, R. P. Kirshner, P. A. Milne, M. A. P. Torres

摘要:

长持续时间的伽马射线暴(GRB)标志着一些大质量恒星的爆炸性死亡,是Ibc型超新星(SNe Ibc)的一个罕见子类。它们的特点是由一个中心引擎(一个吸积黑洞或中子星)提供动力,产生一个充满活力的准直相对论外流。从观测上看,这种外流表现为伽马射线脉冲和长寿命的射电余辉。到目前为止,中央引擎驱动的SNe已经完全通过它们的伽马射线发射被发现,但由于有限的卫星灵敏度或准直发射远离我们的视线,预计还有更多的人口未被发现。在这个框架内,未检测到的伽玛暴的恢复可能通过无线电搜索SNe Ibc与相对论外流。在这里,我们报告了从看似普通的Ibc型SN 2009bb中发现的发光无线电发射,这需要由中央引擎提供动力的大量相对论外流。由于没有同步伽玛暴,SN 2009bb成为第一个没有探测到伽玛射线信号的引擎驱动SN。与我们对SNe Ibc进行的广泛的无线电调查进行比较,发现中心引擎的比例很低,约为1%,这与附近伽玛暴的推断率无关,但与之一致。我们的研究表明,即将到来的光学和无线电调查将很快与伽马射线卫星竞争,以精确定位最近的发动机驱动的SNe。另一颗超新星的类似结果也被独立报道。

英文摘要:

Long duration gamma-ray bursts (GRBs) mark the explosive death of some massive stars and are a rare sub-class of Type Ibc supernovae (SNe Ibc). They are distinguished by the production of an energetic and collimated relativistic outflow powered by a central engine (an accreting black hole or neutron star). Observationally, this outflow is manifested in the pulse of gamma-rays and a long-lived radio afterglow. To date, central engine-driven SNe have been discovered exclusively through their gamma-ray emission, yet it is expected that a larger population goes undetected due to limited satellite sensitivity or beaming of the collimated emission away from our line-of-sight. In this framework, the recovery of undetected GRBs may be possible through radio searches for SNe Ibc with relativistic outflows. Here we report the discovery of luminous radio emission from the seemingly ordinary Type Ibc SN 2009bb, which requires a substantial relativistic outflow powered by a central engine. The lack of a coincident GRB makes SN 2009bb the first engine-driven SN discovered without a detected gamma-ray signal. A comparison with our extensive radio survey of SNe Ibc reveals that the fraction harboring central engines is low, ~1 percent, measured independently from, but consistent with, the inferred rate of nearby GRBs. Our study demonstrates that upcoming optical and radio surveys will soon rival gamma-ray satellites in pinpointing the nearest engine-driven SNe. A similar result for a different supernova is reported independently.

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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