Details

Autor(en) / Beteiligte

• Bagdonaite, J
• Daprà, M
• Jansen, P
• Bethlem, H L
• Ubachs, W
• Muller, S
• Henkel, C
• Menten, K M

Titel

Robust constraint on a drifting proton-to-electron mass ratio at z=0.89 from methanol observation at three radio telescopes

Ist Teil von

• Physical review letters, 2013-12, Vol.111 (23), p.231101-231101, Article 231101

Ort / Verlag

United States

Erscheinungsjahr

2013

Link zum Volltext

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• A limit on a possible cosmological variation of the proton-to-electron mass ratio μ is derived from methanol (CH3OH) absorption lines in the benchmark PKS1830-211 lensing galaxy at redshift z=0.89 observed with the Effelsberg 100-m radio telescope, the Institute de Radio Astronomie Millimétrique 30-m telescope, and the Atacama Large Millimeter/submillimeter Array. Ten different absorption lines of CH3OH covering a wide range of sensitivity coefficients K(μ) are used to derive a purely statistical 1σ constraint of Δμ/μ=(1.5±1.5)×10(-7) for a lookback time of 7.5 billion years. Systematic effects of chemical segregation, excitation temperature, frequency dependence, and time variability of the background source are quantified. A multidimensional linear regression analysis leads to a robust constraint of Δμ/μ=(-1.0±0.8(stat)±1.0(sys))×10(-7).