论文标题
逆多视图I：微弧形VLBI星形统计的多构振子逆相引用
Inverse Multview I: Multi-Calibrator inverse phase referencing for Microarcsecond VLBI Astrometry
论文作者
论文摘要
非常长的基线干涉法（VLBI）天文学是一种良好的技术，用于在频率高于10〜GHz的频率下以$ \ pm10〜μ $作为视差准确性。在较低的频率下，与电离层相关的无偿干涉仪延迟在限制天文学精度方面起着主要作用。 Multiview是一种新型的VLBI校准方法，它使用多个类星体的观测值准确地建模并删除了对干涉仪延迟的时间变化，定向依赖性的变化。在这里，我们通过将数据引用到目标源（“反向多视图”）并测试其性能来扩展多视图技术。在8.3〜GHz下运行的四个Antenna VLBI阵列的多个观察结果显示，单期为$ 20〜μ $的单个周期精度，如目标 - 引用的类星体分离，高达约7度。与标准相引用相比，这代表了天文准确性的提高。
Very Long Baseline Interferometry (VLBI) astrometry is a well established technique for achieving $\pm10~μ$as parallax accuracies at frequencies well above 10~GHz. At lower frequencies, uncompensated interferometer delays associated with the ionosphere play the dominant role in limiting the astrometric accuracy. Multiview is a novel VLBI calibration method, which uses observations of multiple quasars to accurately model and remove time-variable, directional-dependent changes to the interferometer delay. Here we extend the Multiview technique by phase referencing data to the target source ("inverse Multiview") and test its performance. Multiple observations with a four-antenna VLBI array operating at 8.3~GHz show single-epoch astrometric accuracies near $20~μ$as for target-reference quasar separations up to about 7 degrees. This represents an improvement in astrometric accuracy by up to an order of magnitude compared to standard phase referencing.
