土星系统中水脉泽的探索
A Search for Water Masers in the Saturnian System
摘要：
2009年5月，我们利用Nobeyama 45 m射电望远镜观测了土星卫星22.235 GHz的H2O 6（1，6）-5（2，3）脉泽辐射。对土卫六、土卫二、土卫二和阿特拉斯进行了观测，Pogrebenko等人（2009年）报告发现了22.235千兆赫的水脉泽，此外还对土卫八和其他内部卫星进行了观测。我们没有检测到所有观测卫星的水脉泽线的发射，虽然我们的观测灵敏度与Pogrebenko等人的相当，甚至更好。我们推断土星系统的水脉泽辐射是非常微弱的，或者说是零星的。为了进一步了解土星系统中的水脉泽发射，必须进行长期的监测并获得统计结果。
英文摘要：
We searched for H2O 6(1,6)-5(2,3) maser emission at 22.235 GHz from several Saturnian satellites with the Nobeyama 45m radio telescope in May 2009. Observations were made for Titan, Hyperion, Enceladus and Atlas, for which Pogrebenko et al. (2009) had reported detections of water masers at 22.235 GHz, and in addition for Iapetus and other inner satellites. We detected no emission of the water maser line for all the satellites observed, although sensitivities of our observations were comparable or even better than those of Pogrebenko et al.. We infer that the water maser emission from the Saturnian system is extremely weak, or sporadic in nature. Monitoring over a long period and obtaining statistical results must be made for the further understanding of the water maser emission in the Saturnian system.
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