Testing the variability of the proton-to-electron mass ratio from observations of methanol in the dark cloud core L1498

The dependence of the proton-to-electron mass ratio, μ, on the local matter density was investigated using methanol emission in the dense dark cloud core L1498. Towards two different positions in L1498, five methanol transitions were detected and an extra line was tentatively detected at a lower confidence level in one of the positions. The observed centroid frequencies were then compared with their rest-frame frequencies derived from least-squares fitting to a large data set. Systematic effects, as the underlying methanol hyperfine structure and the Doppler tracking of the telescope, were investigated and their effects were included in the total error budget. The comparison between the observations and the rest-frame frequencies constrains potential μ variation at the level of Δμ/μ

Henkel, C (author)
Levshakov, S. A. (author)
Menten, K (author)
Muller, Sebastien,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mullers (author)
Bethlem, H. L. (author)
Leurini, S (author)
Lapinov, A. V. (author)
Ubachs, W. (author)
Chalmers tekniska högskola (creator_code:org_t)

In:Monthly Notices of the Royal Astronomical Society472:4, s. 4434-44430035-87111365-2966

By the author/editor: Dapra, M; Henkel, C; Levshakov, S. A.; Menten, K; Muller, Sebastie ...; Bethlem, H. L.; show more...; Leurini, S; Lapinov, A. V.; Ubachs, W.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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