# Is there a Blazar Nested in the Core of the Radio Galaxy 3C 411?

## TL;DR

This study used VLBI observations to investigate whether the radio galaxy 3C 411 hosts a blazar core, finding no evidence of Doppler-boosted emission but noting flux variability and a straight jet structure.

## Contribution

The paper provides high-resolution VLBI imaging of 3C 411's core, clarifying the absence of a blazar-like core and characterizing its jet morphology and variability.

## Key findings

- No Doppler boosting detected in core brightness temperatures.
- Core shows flux density variability over time.
- Jet morphology is consistent with a straight jet at ~50° inclination.

## Abstract

Previous spectral energy distribution modeling based on XMM-Newton X-ray observation of the classical double-lobed radio galaxy 3C 411 left the possibility open for the presence of a blazar-like core. We investigated this scenario by characterizing the radio brightness distribution in the inner ~10-pc region of the source. We applied the very long baseline interferometry (VLBI) technique at four different frequencies from 1.7 to 7.6 GHz. We analyzed archival data from the Very Long Baseline Array (VLBA) taken in 2014, and data from the European VLBI Network (EVN) obtained in 2017. The VLBI images reveal pc-scale extended structure in the core of 3C 411 that can be modeled with multiple jet components. The measured core brightness temperatures indicate no Doppler enhancement that would be expected from a blazar jet pointing close to the line of sight. While there is no blazar-type core in 3C 411, we found indication of flux density variability. The overall morphology of the source is consistent with a straight jet with ~50{\deg} inclination angle at all scales from pc to kpc.