Constraint on a variation of the protontoelectron mass ratio from H2 absorption towards quasar Q2348011
نویسندگان
چکیده
Molecular hydrogen (H2) absorption features observed in the line of sight to Q2348−011 at redshift zabs 2.426 are analysed for the purpose of detecting a possible variation of the proton-to-electron mass ratio μ ≡ mp/me. By its structure, Q2348−011 is the most complex analysed H2 absorption system at high redshift so far, featuring at least seven distinctly visible molecular velocity components. The multiple velocity components associated with each transition of H2 were modelled simultaneously by means of a comprehensive fitting method. The fiducial model resulted in μ/μ = (−0.68 ± 2.78) × 10−5, showing no sign that μ in this particular absorber is different from its current laboratory value. Although not as tight a constraint as other absorbers have recently provided, this result is consistent with the results from all previously analysed H2-bearing sightlines. Combining all such measurements yields a constraint of | μ/μ| ≤ 10−5 for the redshift range z = 2–3.
منابع مشابه
Keck telescope constraint on cosmological variation of the proton-to-electron mass ratio
Molecular transitions recently discovered at redshift zabs = 2.059 towards the bright background quasar J2123−0050 are analysed to limit cosmological variation in the proton-toelectron mass ratio, μ ≡ mp/me. Observed with the Keck telescope, the optical echelle spectrum has the highest resolving power and largest number (86) of H2 transitions in such analyses so far. Also, (seven) HD transition...
متن کاملNew constraint on cosmological variation of the proton-to-electron mass ratio from Q0528−250
Molecular hydrogen transitions in quasar spectra can be used to constrain variation in the proton-to-electron mass ratio, μ ≡ mp/me, at high redshifts (z 2). We present here an analysis of a new spectrum of the quasar Q0528−250, obtained on Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph (UVES), and analyse the well-known H2 absorber at z = 2.811 in this spectrum. For the...
متن کاملA new constraint on cosmological variability of the proton-to-electron mass ratio
Kaluza-Klein theories and multidimensional cosmological models predict variability of the fundamental physical constants over the cosmic time. Using the VLT/UVES high resolution spectra of the quasar Q0347–3819 and numerous electronic-vibrationalrotational lines of the H2 molecule identified at zabs = 3.025 we test possible changes in the proton-to-electron mass ratio μ0 = mp/me over the period...
متن کاملFirst constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes.
A high signal-to-noise spectrum covering the largest number of hydrogen lines (90 H(2) lines and 6 HD lines) in a high-redshift object was analyzed from an observation along the sight line to the bright quasar source J2123-005 with the Ultraviolet and Visual Echelle Spectrograph on the European Southern Observatory Very Large Telescope (Paranal, Chile). This delivers a constraint on a possible ...
متن کاملA new constraint on the time dependence of the proton − to − electron mass ratio Analysis of the Q 0347 − 383 and Q 0405 − 443 spectra
A new constraint on the time dependence of the proton−to−electron mass ratio Abstract. A new limit on the possible cosmological variation of the proton-to-electron mass ratio µ = mp/me is estimated by measuring wavelengths of H2 lines of Lyman and Werner bands from two absorption systems at z abs = 2.5947 and 3.0249 in the spectra of quasars Q 0405−443 and Q 0347−383, respectively. Data are of ...
متن کامل