Radio Core-Dominance of Fermi-Blazars: Implication for Blazar Unification

TL;DR

This study analyzes radio core-dominance in Fermi-blazars, revealing projection angles, correlations with extended luminosity, and supporting a unified blazar model based on relativistic beaming effects.

Contribution

It provides new insights into the distribution of radio core-dominance across blazar subclasses and supports the unified blazar model through observational correlations.

Findings

Projection angles vary among subclasses.

Significant anti-correlation between core-dominance and extended luminosity.

Distinct separation of high synchrotron-peaking BL Lacs from other subclasses.

Abstract

...The distribution of radio core-dominance is consistent with average projection angles of 13.5, 14.8, 16.8, 20.4, and 28.2 for ISPs, LSPs, FSRQs, HSPs, and radio galaxies, respectively. Linear regression analyses of our data yield significant anti-correlation r greater than 0.60 between core-dominance parameter and extended luminosity in each individual subsample, the correlation is significant only when individual subsamples are considered. There is a systematic sequence of the distribution of the different subclasses on the Core-dominance parameter-extended luminosity plane. Nevertheless, little or no correlation between Core-dominance parameter and core luminosity or between Core dominance parameter and gamma-ray luminosity r, less than 0.50 was observed. There is a clear dichotomy between high synchrotron-peaking BL Lacs and other BL Lac subclasses. The results are consistent with a unified view for blazars and can be understood in terms of relativistic beaming persisting at the largest scales.