用于基于角度尺度的ALMA观测调度、质量评估和波束成形的新方法
New methods for ALMA angular-scale based observation scheduling, quality assessment, and beam shaping
摘要：
到目前为止，ALMA干涉观测的完成是基于实现给定形状和大小的合成光束以及代表光谱范围内的噪声RMS。这种关于角分辨率的方法主要研究干涉仪的最长基线，而很少涉及较大角尺度下的灵敏度。我们正在探索基于角度尺度的调度和质量评估的想法，以及基于角度尺度的可见性加权作为优化观察效率和图像保真度的一步。这种方法将成像质量保证带入干涉仪记录数据的可见度空间，因此简化了程序的许多方面。类似地，在调度期间，对预期成像属性的这种详细评估有助于优化调度过程。该方法适用于所有大于ca的射电干涉仪。10根天线。
英文摘要：
Up to now, the completion of an ALMA interferometric observation is determined based on the achievement of a given shape and size of the synthesized beam and the noise RMS in the representative spectral range. This approach with respect to the angular resolution investigates mainly the longest baselines of the interferometer and says little about the sensitivity at larger angular scales. We are exploring the ideas of angular-scale-based scheduling and quality assessment, and of angular-scale-based visibility weighting as a step towards optimising both observation efficiency and image fidelity. This approach carries the imaging quality assurance into the visibility space where interferometers record the data, and therefore simplifies many aspects of the procedure. Similarly, during scheduling such detailed assessment of the expected imaging properties helps optimising the scheduling process. The methodology is applicable to all radio interferometers with more than ca. 10 antennas.
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