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We use the Risaliti & Lusso (2015) compilation of 808 X-ray and UV fluxmeasurements of quasars (QSOs) in the redshift range $0.061 \leq z \leq 6.28$,alone and in conjuction with baryon acoustic oscillation (BAO) and Hubbleparameter [$H(z)$] measurements, to constrain cosmological parameters in sixcosmological models. The QSO data constraints are significantly weaker than,but consistent with, those from the $H(z)$ + BAO data. A joint analysis of theQSO + $H(z)$ + BAO data is consistent with the current standard model,spatially-flat $\Lambda$CDM, but mildly favors closed spatial hypersurfaces anddynamical dark energy.

Quasar X-ray and UV flux, baryon acoustic oscillation, and Hubble parameter measurement constraints on cosmological model parameters