利用快速开关数据表征亚毫米波阵大气相位起伏
Using Fast-Switching Data to Characterize Atmospheric Phase Fluctuations at the Submillimeter Array
摘要：
对于亚毫米波段的观测，我们通常采用20-30分钟的校准周期，这与任何典型的厘米和毫米波段观测相同。这个周期时间，在很大程度上只校正仪器的相位波动，并存在剩余的相位波动，这是由于时间和空间的大气相位波动。因此，经典的校准周期需要密切关注任何未来的亚毫米波段观测。因此，我们已经获得了快速切换测试数据，在三个附近的校准器之间循环，使用亚毫米阵列（SMA）的周期时间为$\sim$ 90秒，为了理解和优化校准周期，从而实现预期的灵敏度，角分辨率和动态范围的SMA。在这里，我们介绍了这项研究的初步结果。
英文摘要：
For the submillimeter band observations, we have been routinely adopting the calibration cycle time of 20-30 minutes, which is the same as any typical centimeter and millimeter band observations. This cycle time, largely corrects only the instrumental phase fluctuations and there exists residual phase fluctuations, which are attributed to temporal and spatial atmospheric phase fluctuations. Hence, the classical calibration cycle needs closer attention for any future submillimeter band observations. We have therefore obtained fast-switching test data, cycling between three nearby calibrators, using the submillimeter array (SMA) with a cycle time of $\sim$90 sec, in order to understand and optimize the calibration cycle suitably, thereby to achieve the projected sensitivity, angular resolution and dynamic range for the SMA. Here, we present the preliminary results from this study.
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