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Beam Pattern Measurements and Observational Evaluations of the ALMA/ACA 12-m Antenna

机译:ALMA / ACA 12米天线的波束方向图测量和观测评估

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We have evaluated the beam pattern of the ALMA/ACA 12-m antenna with total power observations of Jupiter and the Moon. Models of the expected beam pattern as it passes across Jupiter and the Moon were derived in consideration of the radiation pattern of the actual receiving system and the surface error of the main reflector. Since the profiles of the measured beam patterns were consistent with those of the models within the range from the peak to —20 dB, we confirmed that the antenna achieved the beam pattern expected from its optical design. After this confirmation, we performed astronomical observations. In addition to the detection of the CS J = 3-2 (146.969026 GHz) spectrum toward Orion KL, the change in the Moon intensity was successfully detected during the total lunar eclipse during 2008 February 20-21. A time lag longer than 10 min in the millimeter-wave eclipse relative to the corresponding optical eclipse ephemeris was detected. Mapping observations of the Sun revealed the structure of the chromospheric networks at 147 GHz. These astronomical observations confirmed that the ACA 12-m antenna could be successfully operated under various operating conditions.
机译:我们用木星和月球的总功率观测值评估了ALMA / ACA 12米天线的波束方向图。考虑到实际接收系统的辐射方向图和主反射镜的表面误差,推导出了预期的波束方向图经过木星和月球的模型。由于测得的波束方向图的轮廓与模型的峰值在-20 dB范围内一致,因此我们确认天线达到了其光学设计所预期的波束方向图。确认后,我们进行了天文观测。除了检测到朝向Orion KL的CS J = 3-2(146.969026 GHz)频谱外,还成功检测到2008年2月20-21日的月全食期间月球强度的变化。相对于相应的月食星历表,在毫米波月食中检测到的时滞大于10分钟。对太阳的制图观测揭示了147 GHz色球层网络的结构。这些天文观测证实,ACA 12米天线可以在各种运行条件下成功运行。

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