VLBI and LAT 2-year results for the Bologna Complete Sample

TL;DR

This study analyzes the parsec-scale properties of 94 nearby radio galaxies from the Bologna Complete Sample using VLBI observations, exploring their central engines and potential gamma-ray emissions.

Contribution

It provides the first comprehensive VLBI-based statistical analysis of an unbiased, complete sample of low-redshift radio galaxies, linking radio and gamma-ray data.

Findings

Estimated Doppler factors and viewing angles for the sample.

Identified potential gamma-ray emitting sources.

Highlighted the importance of future Fermi observations.

Abstract

The statistical analysis of parsec scale region of radio galaxies is crucial to obtain information on the nature of their central engine. To this purpose, we defined and observed the Bologna Complete Sample (BCS) which is unbiased with respect to the orientation of the nuclear relativistic jet being selected from low-frequency samples. The BCS is a complete sample of 94 nearby (z<0.1) radio galaxies that are well studied targets with literature kiloparsec data. For all of them, we collected parsec scale information asking new VLBI (VLBA and EVN) observations. Statistical results on their properties in radio band are presented. From the estimates of the Doppler factor and viewing angles, we discuss the connection with the available gamma-ray data. Finally, we show how future observations with Fermi could reveal new important detections of some of the BCS sources.