arXiv 1709.065672017-09astro-ph.HE

从$8$ - $100 {\rm M}_\odot$祖先的广泛核心坍缩模拟得到的弥散超新星中微子背景

Diffuse Supernova Neutrino Background from extensive core-collapse simulations of $8$-$100 {\rm M}_\odot$ progenitors

Shunsaku Horiuchi, Kohsuke Sumiyoshi, Ko Nakamura, Tobias Fischer, Alexander Summa, Tomoya Takiwaki, Hans-Thomas Janka, Kei Kotake

备注：: 14 pages, 8 figures, accepted for publication in MNRAS
DOI：: 10.1093/mnras/stx3271

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摘要：

我们重新审视弥漫超新星中微子背景光最近系统的研究恒星核心崩溃，揭示了定量的影响，崩溃过程中的祖条件。在一般情况下，依赖的祖先的核心坍缩中微子发射的祖先的初始质量不是单调的，但我们表明，它可以，在一阶，其特征在于由核心的紧凑性。第一次，我们纳入了详细的变化，在整个质量范围$8$ - $100 {\rm M}_\odot$的中微子发射，基于（i）的长期模拟的核心崩溃的$8.8 {\rm M}_\odot$ O-Ne-Mg核心的祖先，（ii）超过100模拟的铁核心坍缩到中子星，和（iii）半打模拟的核心坍缩到黑洞（“失败的通道”）。大质量的恒星，经历失败的通道的分数仍然不确定，但鉴于最近的模拟揭示了高紧凑性，有利于崩溃的黑洞，我们的特点失败的分数考虑的阈值紧凑性以上的大质量的恒星崩溃黑洞和低于它的最终残留物是一个中子星。我们预测，未来的检测弥漫超新星中微子背景可能有权力揭示这个阈值的紧凑性，如果它的值是相对较小的建议，最近的几个天文观测的解释。

英文摘要：

We revisit the diffuse supernova neutrino background in light of recent systematic studies of stellar core collapse that reveal the quantitative impacts of the progenitor conditions on the collapse process. In general, the dependence of the progenitor on the core-collapse neutrino emission is not monotonic in progenitor initial mass, but we show that it can, at first order, be characterized by the core compactness. For the first time, we incorporate the detailed variations in the neutrino emission over the entire mass range $8$-$100 {\rm M}_\odot$, based on (i) a long-term simulation of the core collapse of a $8.8 {\rm M}_\odot$ O-Ne-Mg core progenitor, (ii) over 100 simulations of iron core collapse to neutron stars, and (iii) half a dozen simulations of core collapse to black holes (the "failed channel"). The fraction of massive stars that undergo the failed channel remains uncertain, but in view of recent simulations which reveal high compactness to be conducive to collapse to black holes, we characterize the failed fraction by considering a threshold compactness above which massive stars collapse to black holes and below which the final remnant is a neutron star. We predict that future detections of the diffuse supernova neutrino background may have the power to reveal this threshold compactness, if its value is relatively small as suggested by interpretations of several recent astronomical observations.

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