Spatially radiative properties of 3C 58 and G21.5-0.9

Spatially radiative properties of 3C 58 and G21.5-0.9
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3C 58和G21.5-0.9的空间辐射特性

DOI:
10.1093/mnras/stx2223
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发表时间:
2017-12
影响因子:
4.8
通讯作者:
Zhang Li
Zhang Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lu Fang Wu;Gao Quan Gui;Zhu Bo Tao;Zhang Li

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对两个脉冲星风星云(PWNe)3C 58和G21.5−0.9的观测表明,它们具有对称的球形形貌,发射从射电到γ射线的光子,并在X射线波段具有光子指数的径向变化。3C 58和G21.5−0.9的空间辐射特性在空间相关模型的框架下进行建模。结合每个PWN的动力学演化,计算了3C 58和G21.5 - 0.9的光谱能量分布(SED)的时间演化以及光子指数的径向变化。我们的模拟结果表明,观测到的多波段SED和这两个PWNe的X射线波段的光子指数的径向变化可以很好地再现。从模拟结果中,得出了当前扩散系数和磁场的值,包括在终止冲击和空间平均值。结果表明,除了射电和GeV γ射线波段外,几乎所有能区的光子指数都随径向距离的变化而明显变化。
Observations of two pulsar wind nebulae (PWNe) 3C 58 and G21.5−0.9 indicate that they have mostly symmetric spherical morphologies, emit photons from radio to γ-rays and have the radial variations of the photon indices in X-ray band. The spatially radiative properties of 3C 58 and G21.5−0.9 are modelled in the frame of a spatially dependent model. Combining with the dynamical evolution of each PWN, the time evolution of the spectral energy distributions (SEDs) and the radial variations of the photon indices of 3C 58 and G21.5−0.9 are calculated. Our modelling results show that observed multiband SEDs and the radial variations of the photon indices in X-ray band of these two PWNe can be reproduced well. From the modelling results, the values for the present-day diffusion coefficient and magnetic field are derived, including the values at the termination shock and the spatial average. The spatial changes of the present-day photon indices at different bands are predicted and our results show that the photon indices obviously vary with radial distance in almost all of energy range except that in radio and GeV γ-ray bands.
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