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首页> 外文期刊>Publications of the Astronomical Society of Australia >Characterisation of the Mopra Radio Telescope at 16–50 GHz
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Characterisation of the Mopra Radio Telescope at 16–50 GHz

机译：Mopra射电望远镜在16–50 GHz时的特性

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摘要

We present the results of a programme of scanning and mapping observations of astronomical masers and Jupiter designed to characterise the performance of the Mopra Radio Telescope at frequencies between 16 and 50 GHz using the 12-mm and 7-mm receivers. We use these observations to determine the telescope beam size, beam shape, and overall telescope beam efficiency as a function of frequency. We find that the beam size is well fit by ??/D over the frequency range with a correlation coefficient of a??90%. We determine the telescope main beam efficiencies are between a??48 and 64% for the 12-mm receiver and reasonably flat at a??50% for the 7-mm receiver. Beam maps of strong H2O (22 GHz) and SiO masers (43 GHz) provide a means to examine the radial beam pattern of the telescope. At both frequencies, the radial beam pattern reveals the presence of three components: a central a€?corea€?, which is well fit by a Gaussian and constitutes the telescopes main beam; and inner and outer error beams. At both frequencies, the inner and outer error beams extend out to a??2 and a??3.4 times the full-width half maximum of the main beam, respectively. Sources with angular sizes of a factor of two or more larger than the telescope main beam will couple to the main and error beams, and therefore the power contributed by the error beams needs to be considered. From measurements of the radial beam power pattern we estimate the amount of power contained in the inner and outer error beams is of order one-fifth at 22 GHz, rising slightly to one-third at 43 GHz.
机译：我们介绍了天文学masers和Jupiter扫描和测绘观测程序的结果，该程序旨在使用12毫米和7毫米接收器表征Mopra射电望远镜在16至50 GHz之间的频率性能。我们使用这些观测值来确定望远镜光束的大小，光束形状和整体望远镜光束效率与频率的关系。我们发现，在整个频率范围内，光束尺寸与Δε/ D非常吻合，相关系数为αΔ90％。我们确定，对于12毫米接收器，望远镜的主光束效率在a？48到64％之间，而对于7毫米接收器，则在?? 50％处相当平坦。强H2O（22 GHz）和SiO masers（43 GHz）的光束图提供了一种检查望远镜的径向光束方向图的方法。在这两个频率上，径向波束图都显示出三个分量的存在：中心“核心”，由高斯很好地拟合并构成了望远镜的主波束;以及内部和外部误差光束。在两个频率上，内部和外部误差光束分别延伸到主光束的全宽半最大值的αφ2和αφ3.4。角尺寸比望远镜主光束大两倍或更大的光源将耦合到主光束和误差光束，因此需要考虑由误差光束贡献的功率。根据径向波束功率方向图的测量，我们估计内部和外部误差波束中包含的功率在22 GHz时约为五分之一，在43 GHz时略微上升至三分之一。

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