论文标题
用宽带X射线观察检测到的能量脉冲星风云的光谱破坏了
Spectral Break of Energetic Pulsar Wind Nebulae Detected with Wideband X-ray Observations
论文作者
论文摘要
Pulsar风星云（PWNE）是最有活力的银河系来源之一，从无线电波到非常高能量的伽马射线。我们与Suzaku，Chandra，Nustar，Nustar和hitomi Pastervatories一起，对四个急流，N157B，N157B，N157B，PSR J1813-1749，PSR J1400-6325和G21.5-0.9进行宽带X射线光谱。除N157B外，所有样品的硬X射线带中都有显着的光谱断裂或截止功能。破损的幂律配件中的断裂能在4--14 KEV范围内，而截止幂律拟合中的截止能量为22 keV或更高。断裂或截止能量与宿主脉冲星的旋转能量或特征年龄没有显着相关性。尽管其意义不足以结论性，但在破碎的幂律拟合中的光子指数变化与X射线发射效率之间的光子指数变化之间存在可能的相关性。我们讨论什么决定基于简单模型的断裂参数。
Pulsar wind nebulae (PWNe) are one of the most energetic galactic sources with bright emissions from radio waves to very high-energy gamma-rays. We perform wideband X-ray spectroscopy of four energetic PWNe, N157B, PSR J1813-1749, PSR J1400-6325, and G21.5-0.9, with the Suzaku, Chandra, NuSTAR, and Hitomi observatories. A significant spectral break or cutoff feature is found in the hard X-ray band for all the samples, except for N157B. The break energies in the broken power-law fitting are in the range of 4--14 keV, whereas the cutoff energies in the cutoff power-law fitting are at 22 keV or higher. The break or cutoff energy does not show a significant correlation with either the spin-down energy or characteristic age of the hosting pulsars. A possible correlation is found between the photon index change in the broken power-law fitting and the X-ray emitting efficiency of the pulsars, although its significance is not high enough to be conclusive. We discuss what determines the break parameters based on simple models.
