Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions

Details Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions

2003-05-29

arxiv.org/abs/astro-ph/0305550v1

Phys.Rev.Lett. 91 (2003) 011301

Astronomy and Astrophysics

Astrophysics

RevTeX, 4 pages, 1 figure, accepted by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.91.011301

We investigate the constraints that OH microwave transitions in megamasers and molecular absorbers at cosmological distances may place on the evolution of the fine structure constant alpha=e^2/(hbar c). The centimeter OH transitions are a combination of hyperfine splitting and lambda-doubling that can constrain the cosmic evolution of alpha from a single species, avoiding systematic errors in alpha measurements from multiple species which may have relative velocity offsets. The most promising method compares the 18 and 6 cm OH lines, includes a calibration of systematic errors, and offers multiple determinations of alpha in a single object. Comparisons of OH lines to the HI 21 cm line and CO rotational transitions also show promise.

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