Intermediate-mass Elements in Young Supernova Remnants Reveal Neutron Star Kicks by Asymmetric Explosions
Intermediate-mass Elements in Young Supernova Remnants Reveal Neutron Star Kicks by Asymmetric Explosions
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DOI：
10.3847/1538-4357/aab092
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发表时间：
2017-10
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通讯作者：
S. Katsuda;M. Morii;H. Janka;A. Wongwathanarat;K. Nakamura;K. Kotake;K. Mori;E. Müller;T. Takiwaki;Masaomi Tanaka;N. Tominaga;H. Tsunemi
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作者：
S. Katsuda;M. Morii;H. Janka;A. Wongwathanarat;K. Nakamura;K. Kotake;K. Mori;E. Müller;T. Takiwaki;Masaomi Tanaka;N. Tominaga;H. Tsunemi
中子星(NSS)的诞生性质提供了关于引发爆炸的仍有争议的物理过程以及关于中子星的本征物理的重要信息。这些特性包括年轻中子星的高空间速度，平均值为几百千米S−1，其潜在的“踢”机制尚不完全清楚。有两种相互竞争的可能性可能会在NSS诞生期间加速它们的诞生：恒星碎片或中微子的各向异性抛射。在这里，我们提出了来自X射线测量的新证据，在六个年轻的气态超新星遗迹中，硅和钙之间的化学元素优先与中子星运动的方向相反地被排出。这些中子星的踢出速度和磁场强度之间没有相关性。我们的结果支持与非对称爆炸物质抛射有关的中子星踢的流体力学起源，并且它们与中子星加速情景相冲突，该情景引发由粒子和核物理结合非常强的中子星磁场引起的各向异性中微子发射。
The birth properties of neutron stars (NSs) yield important information about the still-debated physical processes that trigger the explosion as well as on intrinsic neutron-star physics. These properties include the high space velocities of young neutron stars with average values of several 100 km s−1, with an underlying “kick” mechanism that is not fully clarified. There are two competing possibilities that could accelerate NSs during their birth: anisotropic ejection of either stellar debris or neutrinos. Here we present new evidence from X-ray measurements that chemical elements between silicon and calcium in six young gaseous supernova remnants are preferentially expelled opposite to the direction of neutron star motion. There is no correlation between the kick velocities and magnetic field strengths of these neutron stars. Our results support a hydrodynamic origin of neutron-star kicks connected to asymmetric explosive mass ejection, and they conflict with neutron-star acceleration scenarios that invoke anisotropic neutrino emission caused by particle and nuclear physics in combination with very strong neutron-star magnetic fields.