A cosmological distance measure using radio-loud quasars

Abstract

We use the X-ray luminosity relation of radio-loud quasars (RLQs) to measure these luminosity distances as well as estimate cosmological parameters. We adopt four parametric models of X-ray luminosity to test luminosity correlation for RLQs and radio-intermediate quasars (RIQs) and give these cosmological distances. By Bayesian information criterion (BIC), the data suggest that the luminosity relation $L_X\propto L_{UV}^{{\gamma }_{uv}}{L}_{Radio}^{{\gamma }_{radio}^{\prime }}$ for RLQs has better goodness of fit, relative to other models, which can be interpreted as this relation being preferred for RLQs. Meanwhile, we compare the results from flat-spectrum radio-loud quasars (FSRLQs) and steep-spectrum radio-loud quasars (SSRLQs), which indicate that their luminosity correlations are not exactly the same. We also consider dividing the RLQs sample into various redshift bins, which can be used to check if the X-ray luminosity relation depends on the redshift. Finally, we apply a combination of RLQs and SNla Pantheon to verify the nature of dark energy concerning whether or not its density deviates from the constant, and give the statistical results.

References in corpus (20)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
• The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release
• The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
• The Last of FIRST: The Final Catalog and Source Identifications
• Gaussian Process Cosmography
• The Sloan Digital Sky Survey-II Supernova Survey: Search Algorithm and Follow-up Observations
• On the origin of radio emission in radio quiet quasars
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Examining the evidence for dynamical dark energy
• New Chandra observations of the jet in 3C273. I. Softer X-ray than radio spectra and the X-ray emission mechanism
• Space-time in light of Karolyhazy uncertainty relation
• A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project
• The $L_{\mathrm{x}}$-$L_{\mathrm{uv}}$-$L_{\mathrm{radio}}$ relation and corona-disk-jet connection in optically selected radio-loud quasars
• Testing Cosmic Distance-Duality Relation from Future Gravitational Wave Standard Sirens
• SDSS AGNs with X-ray Emission from ROSAT PSPC Pointed Observations
• Observational constraint on Dark Energy from Quantum Uncertainty

Cited by in corpus (1)

• A measure of cosmological distance using the \civ\ Baldwin effect in quasars