The H II galaxy Hubble diagram strongly favours R-h = ct over Lambda CDM
AffiliationUniv Arizona, Dept Phys
Univ Arizona, Dept Astron
KeywordsH II regions
cosmology: theory - distance scale
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationThe H ii galaxy Hubble diagram strongly favours Rh = ct over ΛCDM 2016, 463 (2):1144 Monthly Notices of the Royal Astronomical Society
Rights© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractWe 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 Lambda CDM and the R-h = ct universe by optimizing the parameters in each cosmology using a maximization of the likelihood function. For the flat Lambda CDM model, the best fit is obtained with Omega(m) = 0.40(-0.09)(+0.09). However, statistical tools, such as the Akaike (AIC), Kullback (KIC) and Bayes (BIC) Information Criteria favour R-h = Ct over the standard model with a likelihood of approximate to 94.8-98.8 per cent versus only per cent. For wCDM (the version of ACDM with a dark -energy equation of state wde = Pde/Pde rather than was t WA = 1), a statistically acceptable fit is realized with Omega(m) = 0.221(-0.14)(+0.16) and wde = 0.511'0'21-5" which, however, are not fully consistent with their concordance values. In this case, wCDM has two more free parameters than R-h = Ct, and is penalized more heavily by these criteria. We find that R-h = Ct is strongly favoured over wCDM with a likelihood of approximate to 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 ACDM/wCDM in favour of R-h = Ct at a confidence level approaching 3 sigma.
VersionFinal published version
SponsorsNational Basic Research Program ('973' Program) of China [2014CB845800, 2013CB834900]; National Natural Science Foundation of China [11322328, 11373068, 11603076]; Youth Innovation Promotion Association ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences [XDB09000000]; Natural Science Foundation of Jiangsu Province [BK20161096]; Guangxi Key Laboratory for Relativistic Astrophysics; Amherst College; Chinese Academy of Sciences Visiting Professorships for Senior International Scientists [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]