法拉第层析成像中内禀偏振角模糊特性
Properties of Intrinsic Polarization Angle Ambiguities in Faraday Tomography
摘要：
法拉第层析成像是诊断沿视线的偏振和法拉第旋转的强大方法。然而，法拉第层析成像的质量受到几个条件的限制。最近，有报道称法拉第层析成像在某些特定情况下会显示出虚假信号。本文系统地研究了法拉第层析成像中出现伪信号的条件。我们通过伪观测光束内的两个源，以及固有偏振角、旋转测量、强度和频率覆盖的变化来研究这一点。我们发现，虚假信号时出现的源之间的旋转测量是小于1.5倍的旋转测量扩展函数的半高全宽。假信号也依赖于源之间的强度比，并且对于大的比率被减少。另一方面，虚假信号的出现并不取决于频率覆盖范围，这意味着即使在未来的宽带观测（如平方公里阵列（SKA））中，也应该正确理解和考虑不确定性。
英文摘要：
Faraday tomography is a powerful method to diagnose polarizations and Faraday rotations along the line of sight. The quality of Faraday tomography is, however, limited by several conditions. Recently, it is reported that Faraday tomography indicates false signals in some specific situations. In this paper, we systematically investigate the condition of the appearance of false signals in Faraday tomography. We study this by pseudo-observing two sources within a beam, and change in the intrinsic polarization angles, rotation measures, intensities, and frequency coverage. We find that false signals arise when rotation measure between the sources is less than 1.5 times the full width at half maximum of the rotation measure spread function. False signals also depend on the intensity ratio between the sources and are reduced for large ratio. On the other hand, the appearance of false signals does not depend on frequency coverage, meaning that the uncertainty should be correctly understood and taken into consideration even with future wide-band observations such as Square Kilometer Array (SKA).
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