Mon. Not. R. Astron. Soc., 463, 1144-1152 (2016/December-1)
The H II galaxy Hubble diagram strongly favours Rh = ct over ΛCDM.
WEI J.-J., WU X.-F. and MELIA F.
Abstract (from CDS):
We continue to build support for the proposal to use H II galaxies (HIIGx) and giant extragalactic H II regions (GEHR) as standard candles to construct the Hubble diagram at redshifts beyond the current reach of Type Ia supernovae. Using a sample of 25 high-redshift HIIGx, 107 local HIIGx, and 24 GEHR, we confirm that the correlation between the emission-line luminosity and ionized-gas velocity dispersion is a viable luminosity indicator, and use it to test and compare the standard model ΛCDM and the Rh = ct universe by optimizing the parameters in each cosmology using a maximization of the likelihood function. For the flat ΛCDM model, the best fit is obtained with Ω m= 0.40–0.09+0.09. However, statistical tools, such as the Akaike (AIC), Kullback (KIC) and Bayes (BIC) Information Criteria favour Rh = ct over the standard model with a likelihood of ~= 94.8-98.8 per cent versus only ~= 1.2-5.2 per cent. For wCDM (the version of ΛCDM with a dark-energy equation of state wde ≡ pde/ρde rather than wde = wΛ = -1), a statistically acceptable fit is realized with Ωm=0.22-0.14_+0.16 and wde= -0.51–0.25+0.15 which, however, are not fully consistent with their concordance values. In this case, wCDM has two more free parameters than Rh = ct, and is penalized more heavily by these criteria. We find that Rh = ct is strongly favoured over wCDM with a likelihood of ~= 92.9-99.6 per cent versus only 0.4-7.1 per cent. The current HIIGx sample is already large enough for the BIC to rule out ΛCDM/wCDM in favour of Rh = ct at a confidence level approaching 3σ.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
HII regions - galaxies: general - cosmological parameters - cosmology: observations - cosmology: theory - distance scale - cosmology: theory - distance scale
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