中德银河面IV 6厘米偏振巡天经度60度到129度的区域
A Sino-German 6cm polarization survey of the Galactic plane IV. The region from 60deg to 129deg longitude
摘要：
在银河系的星际介质中，弥漫的银河辐射线偏振是磁场的一个特征。在高频率下的观测比在低频率下的观测受法拉第去极化的影响更小，并且能够检测到来自更遥远的银河系区域的偏振发射。我们试图在6厘米波长上对银河系盘的偏振辐射进行灵敏的测量。我们用乌鲁木齐25米望远镜在6cm处对银道面进行了偏振观测，观测范围为60度<1度<129度，|b| <5度。通过外推WMAP偏振数据，恢复了偏振中缺失的大尺度结构。我们提出了6cm的总强度和线性偏振图的调查区域。我们在该区域中鉴定了两个新的HII延伸区G98.3-1.6和G119.6+0.4。在偏振图中可以看到许多偏振片和去偏振结构。沿周边的几个HII复合物的去极化被检测到，并可以解释由法拉第屏蔽模型。我们讨论了一些突出的去极化HII区，其中有几个$μ$ G的规则磁场。在10度<1度<230度的整个6cm测量区域内，U、Q和PI像的结构函数都表现出向内星系方向更大的涨落功率，这表明内星系臂区存在更高的湍流。中德6厘米巡天揭示了弥散磁化星际介质的新性质。该调查也是非常有用的研究个别对象，如HII区，作为法拉第屏幕，并具有高旋转措施，因此在该地区的强大规则磁场。
英文摘要：
Linear polarization of diffuse Galactic emission is a signature of magnetic fields in the interstellar medium of our Galaxy. Observations at high frequencies are less affected by Faraday depolarization than those at lower frequencies and are able to detect polarized emission from more distant Galactic regions. We attempt to perform a sensitive survey of the polarized emission from the Galactic disk at 6 cm wavelength. We made polarization observations of the Galactic plane using the Urumqi 25-m telescope at 6 cm covering the area of 60deg< l <129deg and |b|<5deg. Missing large-scale structures in polarization were restored by extrapolation of the WMAP polarization data. We present the 6cm total intensity and linear polarization maps of the surveyed region. We identify two new extended HII regions G98.3-1.6 and G119.6+0.4 in this region. Numerous polarized patches and depolarization structures are visible in the polarization maps. Depolarization along the periphery of a few HII complexes was detected and can be explained by a Faraday screen model. We discuss some prominent depolarization HII regions, which have regular magnetic fields of several $μ$G. Structure functions of U, Q and PI images of the entire 6cm survey region of 10deg< l < 230deg exhibit much larger fluctuation power towards the inner Galaxy, which suggests a higher turbulence in the arm regions of the inner Galaxy. The Sino-German 6cm survey reveals new properties of the diffuse magnetized interstellar medium. The survey is also very useful for studying individual objects such as HII regions, which act as Faraday screens and have high rotation measures and therefore strong regular magnetic fields inside the regions.
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