期刊
ASTRONOMY & ASTROPHYSICS
卷 492, 期 3, 页码 725-730出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810041
关键词
cosmology: observations; gravitational lensing; astrochemistry; ISM: abundances; ISM: molecules
Using the Atacama Pathfinder Experiment (APEX) telescope, we have detected the rotational ground-state transitions of ortho-ammonia and ortho-water toward the redshift approximate to 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 in the proton to electron mass ratio over the past 7.2 Gyr.
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