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arXiv 0711.2293astro-ph
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年轻星团中的失控碰撞是最亮超新星的起源

A runaway collision in a young star cluster as the origin of the brightest supernova

Simon Portegies Zwart, Edward P. J. van den Heuvel

摘要:

NGC 1260中的超新星2006 gy是\cite{2006CBET..644....1Q, 2006CBET..647....1H, 2006CBET..648....1P, 2006CBET..695....1F}记录到的最明亮的一颗。它的前身可能是一颗质量非常大的恒星($>100$ \msun)\cite{2006astro.ph.12617S},但这与超新星光谱中的氢不相容,因为人们认为$>40$ \msun在爆炸前几十万年就已经脱落了氢包层\cite{2005A&A...429..581M}。或者,它的前身可能是由两颗大质量恒星\cite{2007ApJ...659L..13O}合并而成。在这里,我们表明,在一个密集和年轻的星团(在星系中心附近的那种预期)的大质量恒星的碰撞频率足以提供一个合理的机会,SN 2006gy来自这样的轰击。如果这是正确的解释,那么我们预测,当超新星消失时(大约一年左右),在爆炸现场可以看到一个密集的大质量恒星群。

英文摘要:

Supernova 2006gy in the galaxy NGC 1260 is the most luminous one recorded \cite{2006CBET..644....1Q, 2006CBET..647....1H, 2006CBET..648....1P, 2006CBET..695....1F}. Its progenitor might have been a very massive ($>100$ \msun) star \cite{2006astro.ph.12617S}, but that is incompatible with hydrogen in the spectrum of the supernova, because stars $>40$ \msun are believed to have shed their hydrogen envelopes several hundred thousand years before the explosion \cite{2005A&A...429..581M}. Alternatively, the progenitor might have arisen from the merger of two massive stars \cite{2007ApJ...659L..13O}. Here we show that the collision frequency of massive stars in a dense and young cluster (of the kind to be expected near the center of a galaxy) is sufficient to provide a reasonable chance that SN 2006gy resulted from such a bombardment. If this is the correct explanation, then we predict that when the supernova fades (in a year or so) a dense cluster of massive stars becomes visible at the site of the explosion.

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