A Two-point Diagnostic for the HII Galaxy Hubble Diagram

Abstract

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 R_h=ct universe, over LCDM 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 R_h=ct with Planck LCDM. 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 R_h=ct is statistically preferred over Planck LCDM. 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.

7 pages, 6 figures, 2 tables. Accepted for publication in MNRAS

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Cited by in corpus (10)

• Challenges for $\Lambda$CDM: An update
• A comparison of the R_h=ct and LCDM cosmologies using the Cosmic Distance Duality Relation
• Model-independent Test of the Cosmic Distance Duality Relation
• Using spatial curvature with HII galaxies and cosmic chronometers to explore the tension in $H_0$
• The Maximum Angular-Diameter Distance in Cosmology
• Hubble distancing: Focusing on distance measurements in cosmology
• A Reliable Calibration of HII Galaxies Hubble Diagram with Cosmic Chronometers and Artificial Neural Network
• Tantalizing New Physics from the Cosmic Purview
• Model-independent measurement of the Hubble Constant and the absolute magnitude of Type Ia Supernovae
• Redshift Evolution of the HII Galaxy $L$-$\sigma$ Relation: Gaussian Process Analysis and Cosmological Implications