用SOFIA（SALSA遗留计划）研究河外磁性-- III：首次数据发布和飞行中极化映射特性
Extragalactic magnetism with SOFIA (SALSA Legacy Program) -- III: First data release and on-the-fly polarization mapping characterization
摘要：
本文介绍了利用SOFIA（SALSA Legacy Program）进行的银河系外地磁测量的数据处理。首次发布的数据占2020年1月至2021年12月总授予时间的33%（155.7小时中的51.34小时，包括间接费用）。我们的观察是使用新实施的飞行映射（OTFMAP）技术在偏振模式。我们提出的管道步骤，以获得均匀减少高层次的数据产品的星系偏振图用于科学分析。我们的方法有一个一般的设计，并可以应用到源小于在任何给定的波段的HAWC+阵列的视场。我们估计，OTFMAP极化模式提供了一个减少的观测开销的一个因素2.34，和一个因素1.80的灵敏度的改善相比，以前获得的极化观测使用斩波和点头模式。OTFMAP是对HAWC+偏振模式的重大优化，因为它最终降低了SOFIA/HAWC+的运营成本，将每小时观测收集的科学数据提高到2.49的总系数。OTFMAP极化模式是SALSA的标准观测策略。第一次数据发布的结果和定量分析载于该系列的第四和第五篇论文。
英文摘要：
We describe the data processing of the Survey on extragALactic magnetiSm with SOFIA (SALSA Legacy Program). This first data release presents 33% (51.34h out of 155.7h, including overheads) of the total awarded time taken from January 2020 to December 2021. Our observations were performed using the newly implemented on-the-fly mapping (OTFMAP) technique in the polarimetric mode. We present the pipeline steps to obtain homogeneously reduced high-level data products of polarimetric maps of galaxies for use in scientific analysis. Our approach has a general design and can be applied to sources smaller than the field-of-view of the HAWC+ array in any given band. We estimate that the OTFMAP polarimetric mode offers a reduction of observing overheads by a factor 2.34, and an improvement in sensitivity by a factor 1.80 when compared to previously obtained polarimetric observations using the chopping and nodding mode. The OTFMAP is a significant optimization of the polarimetric mode of HAWC+ as it ultimately reduces the cost of operations of SOFIA/HAWC+ by increasing the science collected per hour of observation up to an overall factor of 2.49. The OTFMAP polarimetric mode is the standard observing strategy of SALSA. The results and quantitative analysis of this first data release are presented in Papers IV and V of the series.
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