A precise and accurate determination of the cosmic microwave background temperature at z=0.89

Abstract

According to the Big Bang theory and as a consequence of adiabatic expansion of the Universe, the temperature of the cosmic microwave background (CMB) increases linearly with redshift. This relation is, however, poorly explored, and detection of any deviation would directly lead to (astro-)physics beyond the standard model. We aim at measuring the temperature of the CMB with an accuracy of a few percent at z=0.89 toward the molecular absorber in the galaxy lensing the quasar PKS1830-211. We adopt a Monte-Carlo Markov Chain approach, coupled with predictions from the non-LTE radiative transfer code RADEX, to solve the excitation of a set of various molecular species directly from their spectra. We determine Tcmb=5.08 pm 0.10 K at 68% confidence level. Our measurement is consistent with the value Tcmb=5.14 K predicted by the standard cosmological model with adiabatic expansion of the Universe. This is the most precise determination of Tcmb at z>0 to date.

Accepted for publication in A&A

References in corpus (7)

• Rotational Excitation of HC_3N by H_2 and He at low temperatures
• Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211
• Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211
• Molecular absorptions in high-z objects
• Measuring the redshift dependence of the CMB monopole temperature with PLANCK data
• Rotational Excitation of polar molecules by H2 and electrons in diffuse clouds
• Redshifted formaldehyde from the gravitational lens B0218+357

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