Rest frequencies of methanol maser lines (Mueller+, 2004)

Details Rest frequencies of methanol maser lines (Mueller+, 2004) Rest frequencies of methanol maser lines (Mueller+, 2004)

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ycat..34281019m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/428/1019. Originally published in: 2004A&A...428.1019M

Physics

Atomic Physics

Atomic Physics, Masers, Molecular Clouds, Radio Lines

Scientific paper

We report accurate laboratory measurements of selected methanol transition frequencies between 0.834 and 230GHz in order to facilitate astronomical velocity analyses. New data have been obtained between 10 and 27GHz and between 60 and 119GHz. Emphasis has been put on known or potential interstellar maser lines as well as on transitions suitable for the investigation of cold dark clouds. Because of the narrow line widths (<0.5km/s) of maser lines and lines detected in dark molecular clouds, accurate frequencies are needed for comparison of the velocities of different methanol lines with each other as well as with lines from other species. In particular, frequencies for a comprehensive set of transitions are given which, because of their low energy levels (<20cm-1 or 30K), are potentially detectable in cold clouds. Global Hamiltonian fits generally do not yet yield the required accuracy. Additionally, we report transition frequencies for other lines that may be used to test and to improve existing Hamiltonian models.
(4 data files).

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