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Properties of intrinsic polarization angle ambiguities in Faraday tomography

机译：法拉第层析成像中本征偏振角模糊度的性质

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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 pseudoobserving 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 the 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 ratios. 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 the Square Kilometer Array (SKA).
机译：法拉第层析成像是诊断沿视线极化和法拉第旋转的有效方法。但是，法拉第断层扫描的质量受到几个条件的限制。最近，据报道，法拉第层析成像在某些特定情况下指示错误信号。在本文中，我们系统地研究了法拉第层析成像中错误信号的出现情况。我们通过伪观测光束中的两个源以及固有偏振角，旋转量度，强度和频率覆盖范围的变化来对此进行研究。我们发现，当源之间的旋转度量小于旋转度量扩展函数的一半的最大值时，会产生错误信号。虚假信号还取决于信号源之间的强度比率，对于较大比率，虚假信号会减少。另一方面，错误信号的出现并不取决于频率覆盖范围，这意味着即使将来使用诸如平方公里阵列（SKA）之类的宽带观测技术，也应该正确理解并考虑不确定性。

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