2013A&A...551A.109M


Query : 2013A&A...551A.109M

2013A&A...551A.109M - Astronomy and Astrophysics, volume 551A, 109-109 (2013/3-1)

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

MULLER S., BEELEN A., BLACK J.H., CURRAN S.J., HORELLOU C., AALTO S., COMBES F., GUELIN M. and HENKEL C.

Abstract (from CDS):

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 to measure 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 adopted a Monte-Carlo Markov chain approach, coupled with predictions from the non-LTE radiative transfer code RADEX, to solve the excitation conditions of a set of various molecular species directly from their spectra. We determine TCMB=5.08±0.10K at 68% confidence level. Our measurement is consistent with the value TCMB=5.14K 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.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmic background radiation - cosmological parameters - quasars: absorption lines - quasars: individual: PKS 1830-211

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 [PBK93] B0218+357 G G 02 21 +35.9           ~ 27 1
2 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 554 3
3 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4762 2
4 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 557 0
5 QSO B1830-211B LeQ 18 33 39.822 -21 03 40.47           ~ 19 1
6 QSO B1830-211A LeQ 18 33 39.871 -21 03 39.78           ~ 19 1
7 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 662 1
8 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2827 2

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