Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to $z\sim 3$

Abstract

In this paper, we present a new compiled milliarcsecond compact radio data set of 120 intermediate-luminosity quasars in the redshift range $0.46<z<2.76$. These quasars show negligible dependence on redshifts and intrinsic luminosity, and thus represents, in the standard model of cosmology, a fixed comoving-length of standard ruler. We implement a new cosmology-independent technique to calibrate the linear size of of this standard ruler as $l_m=11.03\pm 0.25$ pc, which is the typical radius at which AGN jets become opaque at the observed frequency $\nu \sim 2$ GHz. In the framework of flat $\Lambda$CDM model, we find a high value of the matter density parameter, ${\Omega }_m=0.322_{-0.141}^{+0.244}$, and a low value of the Hubble constant, $H_0=67.6_{-7.4}^{+7.8}{\mathrm{kms}}^{-1}{\mathrm{Mpc}}^{-1}$, which is in excellent agreement with the CMB anisotropy measurements by \textit{Planck}. We obtain ${\Omega }_m=0.309_{-0.151}^{+0.215}$, $w=-0.970_{-1.730}^{+0.500}$ at 68.3% CL for the constant $w$ of a dynamical dark-energy model, which demonstrates no significant deviation from the concordance $\Lambda$CDM model. Consistent fitting results are also obtained for other cosmological models explaining the cosmic acceleration, like Ricci dark energy (RDE) or Dvali-Gabadadze-Porrati (DGP) brane-world scenario. While no significant change in $w$ with redshift is detected, there is still considerable room for evolution in $w$ and the transition redshift at which $w$ departing from -1 is located at $z\sim 2.0$. Our results demonstrate that the method extensively investigated in our work on observational radio quasar data can be used to effectively derive cosmological information. Finally, we find the combination of high-redshift quasars and low-redshift clusters may provide an important source of angular diameter distances, considering the redshift coverage of these two astrophysical probes.

arXiv comment36 pages, 5 tables, 16 figures, A&A, in press

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