CHANG-ES XIII：传输过程和NGC 4666的磁场-换向盘磁场指示
CHANG-ES XIII: Transport processes and the magnetic fields of NGC 4666 - indication of a reversing disk magnetic field
摘要：
我们根据两个频率的Change-ES射电连续谱数据分析了边缘螺旋星暴星系NGC 4666的磁场几何形状和宇宙射线的传输过程; 6 GHz（C波段）和1.5 GHz（L波段）。补充的X射线数据被用来研究NGC 4666中的热气体。我们确定在这两个频率为这个星系的总功率发射的无线电标度高度。我们展示了从极化数据导出的磁场方向。利用旋转测度（RM）综合，我们进一步研究了C波段RM值沿圆盘的行为，以研究大尺度磁场图案。我们使用修正的均分公式来计算磁场强度图。此外，我们用一维SPINNAKER模型模拟了宇宙线输运到晕中的过程。NGC 4666的扩展射电晕是盒状的，可能是由先前观测到的超新星驱动的超级风产生的。这是支持我们发现的平流宇宙射线运输，如预期的银河风。scaleheight分析显示，盘的上方和下方以及主轴两侧之间存在不对称的晕。在射电数据中首次发现了中心点源和气泡结构。我们的X射线观测结果显示NGC 4666周围存在一个盒状热晕，进一步证实了中心源的活动星系核性质。NGC 4666的晕中有一个大尺度的X形磁场，就像在其他边缘星系中观察到的那样。分析还显示，NGC 4666的盘沿其半径显示出场反转的迹象，这是首次在外部星系中检测到这种现象。
英文摘要：
We analyze the magnetic field geometry and the transport processes of the cosmic rays of the edge-on spiral starburst galaxy NGC 4666 from CHANG-ES radio continuum data in two frequencies; 6 GHz (C-band) and 1.5 GHz (L-band). Supplementary X-ray data are used to investigate the hot gas in NGC 4666. We determine the radio scale heights of total power emission at both frequencies for this galaxy. We show the magnetic field orientations derived from the polarization data. Using rotation measure (RM) synthesis we further study the behavior of the RM values along the disk in C-band to investigate the large-scale magnetic-field pattern. We use the revised equipartition formula to calculate a map of the magnetic field strength. Furthermore, we model the processes of cosmic-ray transport into the halo with the 1D SPINNAKER model. The extended radio halo of NGC 4666 is box-shaped and is probably produced by the previously observed supernova-driven superwind. This is supported by our finding of an advective cosmic-ray transport such as that expected for a galactic wind. The scaleheight analysis revealed an asymmetric halo above and below the disk as well as between the two sides of the major axis. A central point source as well as a bubble structure is seen in the radio data for the first time. Our X-ray data show a box-shaped hot halo around NGC 4666 and furthermore confirm the AGN nature of the central source. NGC 4666 has a large-scale X-shaped magnetic field in the halo, as has been observed in other edge-on galaxies. The analysis furthermore revealed that the disk of NGC 4666 shows hints of field reversals along its radius, which is the first detection of this phenomenon in an external galaxy.
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