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arXiv 1203.0296astro-ph.HEastro-ph.SR
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与核心坍缩超新星有关的喷流中核的存活

The survival of nuclei in jets associated with core-collapse supernovae

Shunsaku Horiuchi, Kohta Murase, Kunihito Ioka, Peter Meszaros

摘要:

像镍-56这样的重核是在大量的核心坍缩超新星(CCSN)中合成的,包括与伽马射线暴(GRB)相关的高能超新星。最近的研究表明,喷流是CCSN的一个共同特征。这些外流可能在发射或传播过程中夹带合成核,并提供有趣的多信使信号,包括重超高能宇宙射线。在这里,我们调查的破坏过程中,从恒星物质穿过射流材料通过茧,并在传播过程中被成功地加载到喷流。我们发现,原子核可以存活的喷流参数范围,因为碰撞冷却速度比spiritual。虽然正则高亮度伽玛暴喷流可能含有核,但磁主导模型或具有小体积洛伦兹因子的低亮度喷流更有利于具有更显著的重核成分。

英文摘要:

Heavy nuclei such as nickel-56 are synthesized in a wide range of core-collapse supernovae (CCSN), including energetic supernovae associated with gamma-ray bursts (GRBs). Recent studies suggest that jet-like outflows are a common feature of CCSN. These outflows may entrain synthesized nuclei at launch or during propagation, and provide interesting multi-messenger signals including heavy ultra-high energy cosmic rays. Here, we investigate the destruction processes of nuclei during crossing from the stellar material into the jet material via a cocoon, and during propagation after being successfully loaded into the jet. We find that nuclei can survive for a range of jet parameters because collisional cooling is faster than spallation. While canonical high-luminosity GRB jets may contain nuclei, magnetic dominated models or low-luminosity jets with small bulk Lorentz factors are more favorable for having a more significant heavy nuclei component.

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