Revisiting the angular size-redshift cosmological test with milliarcsecond radio structures in active galactic nuclei

Abstract

VLBI measurements of the sizes of compact extragalactic radio sources, jetted active galactic nuclei, provide data for probing the angular size--redshift relation, offering a complementary test to other distance--redshift methods. We analyse a significantly expanded dataset to reassess the angular size--redshift relation and its potential for constraining cosmological model parameters, focusing on the matter density parameter ${\Omega }_{\mathrm{m}}$ in a flat $\Lambda$ Cold Dark Matter Universe. This is the first major update of the compact-source angular size test in the past quarter of a century, using a dataset an order of magnitude larger than in previous studies. MCMC analysis on real data and on multiple mock catalogues to evaluate parameter constraints in the presence of observational scatter. In addition, we conducted a test with 100 randomized catalogues created by shuffling redshifts while preserving other observables. We also explored how astrophysical parameters depend on fixed cosmological models with different ${\Omega }_{\mathrm{m}}$ values. The randomization test showed that the posterior distributions from randomized data do not overlap with those from real observations, confirming that the measured angular size--redshift relation is physically meaningful. The astrophysical model parameter that describes the redshift dependence of the source angular size exhibits degeneracy with ${\Omega }_{\mathrm{m}}$. Simulated mock catalogues indicate that the method is able to constrain ${\Omega }_{\mathrm{m}}$ if the data scatter is below $\sim 20\%$. Scaling estimates suggest that high-quality data of samples of several thousands to $\sim 100000$ sources, a standardisation calibration approach, and/or refining sample selection criteria are needed to fully exploit the potential of the angular size--redshift test with this type of objects (abridged).

Accepted for publication in A&A; 10 pages, 6 figures

References in corpus (45)

• Observational Probes of Cosmic Acceleration
• Cobaya: Code for Bayesian Analysis of hierarchical physical models
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure
• Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
• MOJAVE: XV. VLBA 15 GHz Total Intensity and Polarization Maps of 437 Parsec-Scale AGN Jets From 1996-2017
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• The Dynamic Evolution of Young Extragalactic Radio Sources
• A Global 86GHz VLBI Survey of Compact Radio Sources
• The Third VLBA Calibrator Survey
• The Sixth VLBA Calibrator Survey: VCS6
• The Fifth VLBA Calibrator Survey: VCS5
• The Fourth VLBA Calibrator Survey - VCS4
• Single-epoch VLBI imaging study of bright active galactic nuclei at 2 and 8 GHz
• Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to $z\sim 3$
• The VLBA Galactic Plane Survey -- VGaPS
• Precise geodesy with the Very Long Baseline Array
• Relativistic Jets in the Radio Reference Frame Image Database II: Blazar Jet Accelerations from the First 10 Years of Data (1994 - 2003)
• The distance sum rule from strong lensing systems and quasars - test of cosmic curvature and beyond
• Compact Symmetric Objects and Supermassive Binary Black Holes in the VLBA Imaging and Polarimetry Survey
• New observational constraints on $f(T)$ cosmology from radio quasars
• The wide-field VLBA calibrator survey -- WFCS
• New Associations of Gamma-Ray Sources from the Fermi Second Source Catalog
• The LBA Calibrator Survey of southern compact extragalactic radio sources - LCS1
• The Radio Fundamental Catalogue. I. Astrometry
• Deceleration without dark matter
• A new test of $f(R)$ gravity with the cosmological standard rulers in radio quasars
• Probing modified gravity theories with multiple measurements of high-redshift quasars
• The catalogue of positions of optically bright extragalactic radio sources OBRS-2
• The catalogue of positions of optically bright extragalactic radio sources OBRS-1
• Testing the distance duality relation using type Ia supernovae and ultracompact radio sources
• Tight Cosmological Constraints from the Angular-Size/Redshift Relation for Ultra-Compact Radio Sources
• The Second LBA Calibrator Survey of southern compact extragalactic radio sources - LCS2
• Global millimeter VLBI array survey of ultracompact extragalactic radio sources at 86 GHz
• Cosmological investigation of multi-frequency VLBI observations of ultra-compact structure in $z\sim 3$ radio quasars
• VLBI-selected sample of Compact Symmetric Object candidates and frequency-dependent position of hotspots
• The EVN Galactic Plane Survey - EGaPS
• VLBI ecliptic plane survey: VEPS-1
• Direction of Parsec-Scales Jets for 9220 Active Galactic Nuclei
• Tracing Milky Way scattering by compact extragalactic radio sources
• Parsec-scale properties of steep and flat spectrum extragalactic radio sources from a VLBA survey of a complete north polar cap sample
• Is there a standard measuring rod in the Universe?
• Testing the $R_{\mathrm{h}}=ct$ Universe Jointly with the Redshift-dependent Expansion rate and Angular-diameter and Luminosity Distances
• Cosmological-model-independent tests of cosmic distance duality relation with Type Ia supernovae and radio quasars
• A Nearly Model-Independent Characterization of Dark Energy Properties as a Function of Redshift
• Identifying compact symmetric objects with high-precision VLBI and Gaia astrometry