Search For A Variation Of The Proton-electron Mass Ratio From Methanol Observations

Ubachs, Wim

Permalink

https://hdl.handle.net/2142/51162 Copy

Description

Title

Search For A Variation Of The Proton-electron Mass Ratio From Methanol Observations

Author(s)

Ubachs, Wim

Contributor(s)

• Menten, Karl
• Henkel, Christian
• Muller, Sebastien
• Kanekar, Nissim
• Bethlem, Hendrick
• Dapra, Mario
• Bagdonaite, Julija

Issue Date

2014-06-19

Keyword(s)

Cold/Ultra-cold/Physics

Abstract

A limit on a possible cosmological variation of the proton-to-electron mass ratio $\mu$ is derived from observation of methanol lines in the PKS1830-211 lensed galaxy at redshift $z \sim 0.89$ with the Effelsberg 100 m single-dish radio telescope (at frequencies 6.5 - 32 GHz), the IRAM 30 m telescope (at frequencies 80 - 160 GHz), and band-6 of the novel ALMA telescope array (at 260 GHz). Ten different absorption lines of CH$_3$OH are detected covering a wide range of sensitivity coefficients $K_{\mu}$. Systematic effects of chemical segregation, excitation temperature, frequency dependence, and time variability of the back- ground source are quantified. A robust constraint of $\Delta\mu/\mu = (1.0 \pm 0.8_{stat} \pm 1.0_{syst}) \times 10^{-7}$ is derived from this large sample of lines belonging to a single molecular species. Analysis of additional observations at the E-VLA radio telescope is under way.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51162

DOI

https://doi.org/10.15278/isms.2014.RH14

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

Owning Collections