Tale of J1328+2752: a misaligned double-double radio galaxy hosted by a binary black-hole?

TL;DR

This study investigates the complex radio morphology and spectral properties of the double-double radio galaxy J1328+2752, suggesting it may host a binary supermassive black hole due to its misaligned jets and double-peaked emission lines.

Contribution

It provides new low-frequency GMRT and SDSS data analysis revealing the galaxy's misaligned jets and potential binary black hole, advancing understanding of merger-driven jet activity.

Findings

Inner double is misaligned by ~30° from outer structure

SDSS spectrum shows double-peaked emission lines

Evidence supports merger-driven repeated jet activity

Abstract

We present a radio and optical study of the double-double radio galaxy J1328+2752 based on new low-frequency GMRT observations and SDSS data. The radio data were used to investigate the morphology and to perform a spectral index analysis. In this source we find that the inner double is misaligned by $\sim$30$^\circ$ from the axis of the outer diffuse structure. The SDSS spectrum shows that the central component has double-peaked line profiles with different emission strengths. The average velocity off-set of the two components is 235$\pm$10.5 km s$^{-1}$. The misaligned radio morphology along with the double-peaked emission lines indicate that this source is a potential candidate binary supermassive black hole. This study further supports mergers as a possible explanation for repeated jet activity in radio sources.