SN 1006星际磁场的方位角
Aspect angle for interstellar magnetic field in SN 1006
摘要：
超新星遗迹中强激波周围发生的许多重要过程依赖于激波的相似性。测量的同步辐射通量是星际磁场（ISMF）和视线之间的方位角的函数。因此，SNR的非热发射模型应考虑环境磁场的方向。我们开发了一种新的方法估计的方位角，观测和合成的信噪比的无线电地图之间的比较的基础上，作出不同的假设的依赖电子注入效率的冲击的冲击波。该方法利用射电表面亮度的方位角剖面作为探测环境磁场方向的探针，因为它对下游磁场的分布和发射电子几乎不敏感。我们将我们的方法应用到SN 1006的一个新的无线电图像的基础上产生的档案VLA和帕克斯数据。图像恢复发射从所有空间结构的角度尺度从几弧秒到15弧分。我们探索了不同的注入效率模型，并找到了SN 1006方位角的以下最佳拟合值：如果注入是各向同性的，则phi=70 +/- 4.2度，准垂直注入的phi=64 +/- 2.8度（SNR在两种情况下都有赤道带），准平行注入的phi=11 +/- 0.8度（SNR的极冠模型）。在最后一种情况下，SN 1006预期具有与所观察到的相反的中心峰值形态。因此，我们的分析提供了一些指示对准平行注入模型。
英文摘要：
A number of important processes taking place around strong shocks in supernova remnants (SNRs) depend on the shock obliquity. The measured synchrotron flux is a function of the aspect angle between interstellar magnetic field (ISMF) and the line of sight. Thus a model of non-thermal emission from SNRs should account for the orientation of the ambient magnetic field. We develop a new method for the estimation of the aspect angle, based on the comparison between observed and synthesized radio maps of SNRs, making different assumptions about the dependence of electron injection efficiency on the shock obliquity. The method uses the azimuthal profile of radio surface brightness as a probe for orientation of ambient magnetic field because it is almost insensitive to the downstream distribution of magnetic field and emitting electrons. We apply our method to a new radio image of SN 1006 produced on the basis of archival VLA and Parkes data. The image recovers emission from all spatial structures with angular scales from few arcseconds to 15 arcmin. We explore different models of injection efficiency and find the following best-fitting values for the aspect angle of SN 1006: phi=70 +/- 4.2 deg if the injection is isotropic, phi=64 +/- 2.8 deg for quasi-perpendicular injection (SNR has an equatorial belt in both cases) and phi=11 +/- 0.8 deg for quasi-parallel injection (polar-cap model of SNR). In the last case, SN 1006 is expected to have a centrally-peaked morphology contrary to what is observed. Therefore, our analysis provides some indication against the quasi-parallel injection model.
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