PKS 1830-211系统引力透镜中z~0.89星际介质对亚毫米水和氨的吸收
Submillimeter water and ammonia absorption by the peculiar z~0.89 interstellar medium in the gravitational lens of the PKS 1830-211 system
摘要：
利用阿塔卡玛探路者实验望远镜（APEX），在PKS 1830-211引力透镜系统中观测到了正氨和正水分子向红移~0.89吸收星系的转动基态跃迁。我们讨论我们的意见，最近的空间数据的背景下获得的这些线与SWAS和奥丁卫星对银河系的来源。我们发现的共同点，但也显着差异的星际介质中的星系在中等红移和银河系。未来对PKS 1830-211基态氨跃迁的高质量观测，以及反演线数据，将对过去7.2 Gyr的质子与电子质量比的变化产生强有力的约束。
英文摘要：
Using the Atacama Pathfinder Experiment (APEX) telescope we have detected the rotational ground-state transitions of ortho-ammonia and ortho-water toward the redshift ~0.89 absorbing galaxy in the PKS 1830-211 gravitational lens system. We discuss our observations in the context of recent space-borne data obtained for these lines with the SWAS and Odin satellites toward Galactic sources. We find commonalities, but also significant differences between the interstellar media in a galaxy at intermediate redshift and in the Milky Way. Future high-quality observations of the ground-state ammonia transition in PKS 1830-211, together with inversion line data, will lead to strong constraints on the variation of the proton to electron mass ratio over the past 7.2 Gyr.
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