Tianlai Pathfinder Array: Measuring Primary Beam with Sky Model

The measurement of the Tianlai Cylinder Pathfinder Array's primary beam pattern represents a significant step in calibrating this radio telescope. By exploiting the North-South motion of the Sun and decomposing the primary beam into independent East-West and North-South components, the researchers were able to accurately characterize the array's response. The use of the Sun as a calibration source and a sky map model to derive the best-fit N-S beam demonstrates a clever approach to beam pattern measurement. The consistency of the results with previous expectations validates the methodology and the array's design. Accurate beam pattern measurement is essential for achieving high-quality astronomical observations and mapping the sky with precision. This work enhances the Tianlai array's capabilities and contributes to our understanding of the universe. Future research could focus on refining the beam pattern measurement techniques and applying them to other radio telescopes. The Tianlai project's commitment to advancing radio astronomy is commendable and holds promise for future discoveries.

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