VLBI observation of giant radio galaxy J1313+696 at 2.3/8.4 GHz

TL;DR

This study presents VLBI observations of the giant radio galaxy J1313+696, revealing a steep spectrum core that suggests renewed activity and potential absorption, with implications for understanding its core structure.

Contribution

First VLBI observation of J1313+696 at dual frequencies showing a steep spectrum core indicating renewed activity and core absorption features.

Findings

Detected only the core component at 2.3/8.4 GHz

Core exhibits a steep spectrum with α = -0.82

Core likely has a GHz-peaked spectrum and is absorbed

Abstract

We report the result of VLBI observation of the giant radio galaxy J1313+696 (4C +69.15) at 2.3/8.4 GHz, only the core component of the giant radio galaxy was detected in the VLBI observation at the dual frequencies. The result shows a steep spectrum core with $\alpha=-0.82$ ($S \propto \nu^{\alpha}$) between 2.3 GHz and 8.4 GHz. The steep spectrum core may be a sign of renewed activity. Considering also the upper limit flux density of 2.0 mJy at 0.6 GHz from Konar et al. 2004 the core has a GHz-peaked spectrum, implying that the core is compact and absorbed. Further high resolution VLBI observations are needed to identify if the steep spectrum core is consisting of a core and steep spectrum jet.