7 mm和1.3 cm处M87核中的线性极化
Linear polarization in the nucleus of M87 at 7 mm and 1.3 cm
摘要：
我们报告了2017-2018年使用甚长基线阵列在24 GHz（$λ=$ 1.3 cm）和43 GHz（$λ=$ 7 mm）对附近射电星系M87进行的高角分辨率偏振观测。新的图像的线性极化子结构在核区域，其特征在于由两个组件的偏振强度和平滑旋转的偏振平面周围的43 GHz的核心图案。通过与2007年类似数据集的比较，我们发现这种全球极化模式在11年的时间间隔内保持稳定，同时显示出较小的月尺度变化。我们讨论了在厘米到毫米波长下，M87核可能的法拉第旋转。这些结果可以被解释的情况下，所观察到的偏振模式与磁结构的限制磁流体风，这也是所观察到的法拉第旋转的来源。
英文摘要：
We report on high angular resolution polarimetric observations of the nearby radio galaxy M87 using the Very Long Baseline Array at 24 GHz ($λ=$1.3 cm) and 43 GHz ($λ=$7 mm) in 2017-2018. New images of the linear polarization substructure in the nuclear region are presented, characterized by a two-component pattern of polarized intensity and smooth rotation of the polarization plane around the 43 GHz core. From a comparison with an analogous dataset from 2007, we find that this global polarization pattern remains stable on a time interval of 11 yr, while showing smaller month-scale variability. We discuss the possible Faraday rotation toward the M87 nucleus at centimeter to millimeter wavelengths. These results can be interpreted in a scenario where the observed polarimetric pattern is associated with the magnetic structure in the confining magnetohydrodynamic wind, which also serves as the source of the observed Faraday rotation.
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