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Trans-Alfvénic magnetohydrodynamic turbulence in the vicinity of supernova remnant Cassiopeia-A shocks
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2020-09-10 , DOI: 10.1093/mnras/staa2293
Pavan Kumar Vishwakarma 1 , Jais Kumar 1
Affiliation  

Statistics of the magnetic field disturbances in the supernova remnants (SNRs) can be accessed using the second-order correlation function of the synchrotron intensities. Here we measure the magnetic energy spectra in supernova remnant Cassiopeia-A by two-point correlation of the synchrotron intensities, using a recently developed unbiased method. The measured magnetic energy spectra in the vicinity of supernova remnant shocks are found to be 2/3 power law over the decade of range scales, showing the developed trans-Alfvenic magnetohydrodynamic turbulence. Our results are globally consistent with the theoretical prediction of trans-Alfvenic Mach number in developed magneto-hydrodynamic turbulence and can be explained by the amplification of the magnetic field in the vicinity of SNR shocks. The magnetic energy spectra predict SNR Cassiopeia-A having an additional subshock in the radio frequency observation along with forward and reverse shocks, with a radial window of the amplified magnetic field of ~ 0.115pc near the shocks

中文翻译:

超新星遗迹仙后座 A 激波附近的跨阿尔芬磁流体动力学湍流

可以使用同步加速器强度的二阶相关函数访问超新星遗迹 (SNR) 中磁场扰动的统计数据。在这里,我们使用最近开发的无偏方法,通过同步加速器强度的两点相关性测量超新星遗迹仙后座 A 的磁能谱。发现在超新星残余冲击附近测量的磁能谱在 10 年的距离尺度上为 2/3 幂律,显示出发展的跨阿尔芬尼磁流体动力学湍流。我们的结果与发展磁流体动力学湍流中跨阿尔芬马赫数的理论预测总体一致,并且可以通过 SNR 冲击附近磁场的放大来解释。
更新日期:2020-09-10
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