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Title:
Constraints on Changes in Fundamental Constants from a Cosmologically Distant OH Absorber or Emitter
Authors:
Kanekar, N.; Carilli, C. L.; Langston, G. I.; Rocha, G.; Combes, F.; Subrahmanyan, R.; Stocke, J. T.; Menten, K. M.; Briggs, F. H.; Wiklind, T.
Affiliation:
AA(National Radio Astronomy Observatory, Socorro, New Mexico 87801, USA), AB(National Radio Astronomy Observatory, Socorro, New Mexico 87801, USA), AC(National Radio Astronomy Observatory, Socorro, New Mexico 87801, USA), AD(Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom), AE(Observatoire de Paris, F-75014, Paris, France), AF(Australia Telescope National Facility, NSW 1710, Australia), AG(University of Colorado, Boulder, Colorado 80309, USA), AH(Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany), AI(Australia Telescope National Facility, NSW 1710, Australia; Australian National University, ACT 2611, Australia), AJ(Space Telescope Science Institute, Baltimore, Maryland 21218, USA)
Publication:
Physical Review Letters, vol. 95, Issue 26, id. 261301 (PhRvL Homepage)
Publication Date:
12/2005
Origin:
APS
DOI:
10.1103/PhysRevLett.95.261301
Bibliographic Code:
2005PhRvL..95z1301K

Abstract

We have detected the four 18 cm OH lines from the &ztilde;0.765 gravitational lens toward PMN J0134-0931. The 1612 and 1720 MHz lines are in conjugate absorption and emission, providing a laboratory to test the evolution of fundamental constants over a large lookback time. We compare the HI and OH main line absorption redshifts of the different components in the &ztilde;0.765 absorber and the &ztilde;0.685 lens toward B0218+357 to place stringent constraints on changes in F≡gp[α2/μ]1.57. We obtain [ΔF/F]=(0.44±0.36stat±1.0syst)×10-5, consistent with no evolution over the redshift range 0<z≲0.7. The measurements have a 2σ sensitivity of [Δα/α]<6.7×10-6 or [Δμ/μ]<1.4×10-5 to fractional changes in α and μ over a period of ˜6.5Gyr, half the age of the Universe. These are among the most sensitive constraints on changes in μ.
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