Catalog of Radio Galaxies with z>0.3. III: Angular Sizes and Flux Density According to the NVSS Data

TL;DR

This paper constructs a sample of distant radio galaxies with z>0.3 from multiple databases, analyzes their angular sizes and flux densities using NVSS data, and presents preliminary statistical relationships for cosmological testing.

Contribution

It introduces a new sample of high-redshift radio galaxies free of quasars and analyzes their angular size and flux density relationships for cosmological applications.

Findings

Sample of distant radio galaxies constructed and verified.

Identified relationships between angular size, flux density, and redshift.

Separated subsamples based on size and flux density.

Abstract

We describe the procedure of the construction of a sample of distant ($z>0.3$) radio galaxies using the NED, CATS and SDSS databases for further use in various statistical tests. We believe the sample to be free of objects with quasar properties. This paper is the third part of the description of the radio galaxies catalog that we plan to use for cosmological tests. We report the results of the sample of angular sizes for the NVSS survey list objects, and its preliminary statistical analysis. Three-parameter diagrams "angular size-redshift-flux density" and "angular size-redshift-spectral index", and their two-parameter projections are constructed. Three subsamples of radio galaxies are separated in the "source size--flux density" diagram.