TY - JOUR
T1 - Analysis of carbon monoxide absorption at zabs ≃ 2.5 to constrain variation of the proton-to-electron mass ratio
AU - Dapra, M.
AU - Noterdaeme, P.
AU - Vonk, M.
AU - Murphy, M.T.
AU - Ubachs, W.
PY - 2017/6
Y1 - 2017/6
N2 - Absorption by carbon monoxide in the spectrum of quasar SDSS J000015.16+004833.2 is investigated in order to derive a constraint on the temporal variation of the proton-to-electron mass ratio, μ. The spectrum was recorded using Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph, and it was partially corrected for long-range wavelength scale distortions using the supercalibration technique. Eight vibrational CO singlet–singlet bands belonging to the A1Π–X1Σ+ electronic absorption system, and the perturbing d3Δ–X1Σ+(5, 0) singlet–triplet band are detected in the damped Lyman α system at zabs ≃ 2.52. The spectra are modelled using a comprehensive fitting technique, resulting in a final value of Δμ/μ = (1.8 ± 2.2stat ± 0.4syst) × 10−5, which is consistent with no variation over a look-back time of ∼11.2 Gyr.
AB - Absorption by carbon monoxide in the spectrum of quasar SDSS J000015.16+004833.2 is investigated in order to derive a constraint on the temporal variation of the proton-to-electron mass ratio, μ. The spectrum was recorded using Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph, and it was partially corrected for long-range wavelength scale distortions using the supercalibration technique. Eight vibrational CO singlet–singlet bands belonging to the A1Π–X1Σ+ electronic absorption system, and the perturbing d3Δ–X1Σ+(5, 0) singlet–triplet band are detected in the damped Lyman α system at zabs ≃ 2.52. The spectra are modelled using a comprehensive fitting technique, resulting in a final value of Δμ/μ = (1.8 ± 2.2stat ± 0.4syst) × 10−5, which is consistent with no variation over a look-back time of ∼11.2 Gyr.
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U2 - 10.1093/mnras/stx331
DO - 10.1093/mnras/stx331
M3 - Article
SN - 0035-8711
VL - 467
SP - 3848
EP - 3855
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -