论文标题
闭合痕迹：射电天文学的新型校准不敏感数量
Closure Traces: Novel Calibration-Insensitive Quantities for Radio Astronomy
论文作者
论文摘要
闭合阶段和闭合振幅已被证明对现代无线电干涉量至关重要，因为它们对不确定的站点的增长不敏感。我们提出了第一组封闭量，该封闭量是通过对站立和极化泄漏不敏感的平行手和交叉可见性构建的。这些复杂的“闭合痕迹”是闭合幅度和闭合阶段的自然扩展，它独立于所有基于站的极化可见性的线性线性腐败，并且从某种意义上说，它们包含可见性数据中存在的所有剩余信息。所谓的“共轭”四边形上的闭合痕迹的产物仅对源极化部分中的结构敏感 - 与Stokes $ i $结构的变化无关，从而提供了天文来源中极化的明确探测。
Closure phases and closure amplitudes have proven critical to modern radio interferometry due to their insensitivity to the uncertain station gains. We present the first set of closure quantities constructed from parallel-hand and cross-hand visibilities that are insensitive to both station gains and to polarimetric leakage. These complex "closure traces" are a natural extension of closure amplitudes and closure phases, are independent of all station-based linear corruptions of the polarized visibilities, and are complete in the sense that they contain all remaining information present in the visibility data. Products of closure traces on so-called "conjugate" quadrangles are sensitive only to structure in the source polarization fraction -- independent of variations in the Stokes $I$ structure -- and thereby provide unambiguous probes of polarization in astronomical sources.
