Tsiapi, Pavlina search by orcid ; Basilakos, Spyros search by orcid ; Plionis, Manolis ; Terlevich, Roberto search by orcid ; Terlevich, Elena ; Gonzalez Moran, Ana Luisa ; Chavez, Ricardo search by orcid ; Bresolin, Fabio search by orcid ; Fernandez Arenas, David search by orcid ; Telles, Eduardo
Monthly Notices of the Royal Astronomical Society, Volume 506, Issue 4, pp.5039-5045
Publication year: 2021

We present novel cosmological constraints based on a joint analysis of our H II galaxies (HIIG) Hubble relation with the full Planck cosmic microwave background (CMB) anisotropy spectrum and the baryon acoustic oscillations (BAO) probes. The HIIG span a large redshift range (0.088 ≤ z ≤ 2.5), reaching significantly higher redshifts than available Type Ia supernovae (SNeIa) and hence they probe the cosmic expansion at earlier times. Our independent constraints compare well with those based on the ‘Pantheon’ compilation of SNeIa data, which we also analyse. We find our results to be in agreement with the conformal Λ cold dark matter (ΛCDM) model within 1σ. We also use our HIIG data to examine the behaviour of the dark energy equation-of-state parameter under the Chevallier-Polarski-Linder (CPL) parametrization, w = w0 + waz/(1 + z), and find consistent results with those based on SNeIa, although the degeneracy in the parameter space and the individual parameter uncertainties, when marginalizing one over the other, are quite large.

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