A two-point diagnostic for the hii galaxy hubble diagram

Kyle Leaf, Fulvio Melia

Research output: Contribution to journalArticlepeer-review


A previous analysis of starburst-dominated HII Galaxies and HII regions has demonstrated a statistically significant preference for the Friedmann-Robertson-Walker cosmology with zero active mass, known as the Rh = ct universe, over CDM and its related dark-matter parametrizations. In this paper, we employ a 2-point diagnostic with these data to present a complementary statistical comparison of Rh = ct with Planck CDM. Our 2-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 HII measurements may not be purely Gaussian, perhaps due to a partial contamination by non-Gaussian systematic effects. The use of HII Galaxies and HII regions as standard candles may be improved even further with a better handling of the systematics in these sources.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Nov 29 2017


  • Cosmology: Large-scale structure of the universe, cosmology: Observations, cosmology: Theory, distance scale
  • Galaxies: General

ASJC Scopus subject areas

  • General

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