Robust Constraint on a Drifting Proton-to-Electron Mass Ratio atz=0.89from Methanol Observation at Three Radio Telescopes

Autor:	M. Daprà, Karl M. Menten, Hendrick L. Bethlem, Paul Jansen, Sebastien Muller, Wim Ubachs, Christian Henkel, J. Bagdonaite
Rok vydání:	2013
Předmět:	Physics General Physics and Astronomy Astrophysics Mass ratio Proton-to-electron mass ratio 01 natural sciences Billion years Submillimeter Array Galaxy Redshift law.invention Radio telescope Telescope law 0103 physical sciences 010306 general physics 010303 astronomy & astrophysics
Zdroj:	Physical Review Letters. 111
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.111.231101
Popis:	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 Millimetrique 30-m telescope, and the Atacama Large Millimeter/submillimeter Array. Ten different absorption lines of CH3OH covering a wide range of sensitivity coefficients Kμ 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±0.8stat±1.0sys)×10−7.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4c9a44d53b3a3c226be8a4932dda2e6a https://doi.org/10.1103/physrevlett.111.231101 Zobrazit plný text záznamu