HIGH-ENERGY NEUTRINO EMISSION FROM WHITE DWARF MERGERS

HIGH-ENERGY NEUTRINO EMISSION FROM WHITE DWARF MERGERS
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白矮星合并产生的高能中微子发射

DOI:
10.3847/0004-637x/832/1/20
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发表时间:
2016-08
影响因子:
4.9
通讯作者:
Dai Zi-Gao
Dai Zi-Gao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xiao Di;Meszaros Peter;Murase Kohta;Dai Zi-Gao

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两颗白色矮星的合并预计会产生一个被碎片盘包围的中心快速旋转的核心,其中磁旋转不稳定性会产生热的磁化日冕和磁化外流。通过重联的磁能耗散可能导致膨胀物质中的宇宙射线(CR)加速,这将导致高能中微子。我们讨论了使用这些中微子信号作为探针的流出动力学,磁能耗散率,CR加速效率的可能性。重要的是,伴随而来的高能伽马射线由于大的光学深度而被吸收在这些源中,因此这些中微子源可以被视为隐藏的宇宙射线加速器,这与费米-LAT无法检测到伽马射线是一致的。虽然CR的产生率是高度不确定的,如果它达到,扩散中微子通量可能会贡献冰立方观测的很大一部分。我们还评估了观察单个合并事件的前景,这为将来测试此类来源提供了一种手段。
The merger of two white dwarfs is expected to result in a central fast-rotating core surrounded by a debris disk, in which magnetorotational instabilities give rise to a hot magnetized corona and a magnetized outflow. The dissipation of magnetic energy via reconnection could lead to the acceleration of cosmic-rays (CRs) in the expanding material, which would result in high energy neutrinos. We discuss the possibility of using these neutrino signals as probes of the outflow dynamics, magnetic energy dissipation rate, and CR acceleration efficiency. Importantly, the accompanying high-energy gamma-rays are absorbed within these sources because of the large optical depth, so these neutrino sources can be regarded as hidden cosmic-ray accelerators that are consistent with the non-detection of gamma-rays with Fermi-LAT. While the CR generation rate is highly uncertain, if it reaches , the diffuse neutrino flux could contribute a substantial fraction of the IceCube observations. We also evaluate the prospect of observing individual merger events, which provides a means for testing such sources in the future.
重新审视超新星和超新星遗迹对弥漫高能背景的贡献:对极高红移注入的限制
DOI: 10.3847/0004-637x/826/2/133
发表时间: 2016-04
影响因子: 4.9
作者:
Xiao Di;Meszaros Peter;Murase Kohta;Dai Zi-Gao
通讯作者: Dai Zi-Gao
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发表时间: 2006-01
影响因子: 6.4
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