Independent cosmological constraints from high-z HII galaxies: new results from VLT-KMOS data

Abstract

We present independent determinations of cosmological parameters using the distance estimator based on the established correlation between the Balmer line luminosity, L(H$\beta$), and the velocity dispersion ($\sigma$) for HII galaxies (HIIG). These results are based on new VLT-KMOS high spectral resolution observations of 41 high-z ($1.3\le$ z $\le 2.6$) HIIG combined with published data for 45 high-z and 107 z $\le 0.15$ HIIG, while the cosmological analysis is based on the MultiNest MCMC procedure not considering systematic uncertainties. Using only HIIG to constrain the matter density parameter (${\Omega }_m$), we find ${\Omega }_m=0.244_{-0.049}^{+0.040}$ (stat), an improvement over our best previous cosmological parameter constraints, as indicated by a 37% increase of the FoM. The marginalised best-fit parameter values for the plane $\{{\Omega }_m;w_0\}$ = $\{0.249_{-0.065}^{+0.11};-1.18_{-0.41}^{+0.45}\}$ (stat) show an improvement of the cosmological parameters constraints by 40%. Combining the HIIG Hubble diagram, the cosmic microwave background (CMB) and the baryon acoustic oscillation (BAO) probes yields ${\Omega }_m=0.298\pm 0.012$ and $w_0=-1.005\pm 0.051$, which are certainly compatible -- although less constraining -- than the solution based on the joint analysis of SNIa/CMB/BAO. An attempt to constrain the evolution of the dark energy with time (CPL model), using a joint analysis of the HIIG, CMB and BAO measurements, shows a degenerate 1$\sigma$ contour of the parameters in the $\{w_0,w_a\}$ plane.

Accepted to be published in the main journal of the Monthly Notices of the Royal Astronomical Society

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