AffiliationUniv Arizona, Dept Phys
Univ Arizona, Dept Phys, Appl Math Program
Univ Arizona, Dept Astron
large-scale structure of Universe
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationKyle Leaf, Fulvio Melia; A two-point diagnostic for the H II galaxy Hubble diagram, Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, 11 March 2018, Pages 4507–4513, https://doi.org/10.1093/mnras/stx3109
Rights© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractA previous analysis of starburst-dominated H II galaxies and H II regions has demonstrated a statistically significant preference for the Friedmann–Robertson–Walker cosmology with zero active mass, known as the Rh = ct universe, over cold dark matter (CDM) and its related dark-matter parametrizations. In this paper, we employ a two-point diagnostic with these data to present a complementary statistical comparison of Rh = ct with Planck CDM. Our two-point diagnostic compares, in a pairwise fashion, the difference between the distance modulus measured at two redshifts with that predicted by each cosmology. Our results support the conclusion drawn by a previous comparative analysis demonstrating that Rh = ct is statistically preferred over Planck CDM. But we also find that the reported errors in the H II measurements may not be purely Gaussian, perhaps due to a partial contamination by non-Gaussian systematic effects. The use of H II galaxies and H II regions as standard candles may be improved even further with a better handling of the systematics in these sources.
VersionFinal accepted manuscript