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

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.

6 pages, 4 figures, Accepted for publication in MNRAS Letters

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• A low-frequency study of recently identified double-double radio galaxies
• Double-peaked Lines, Dual VLBI Components, and Precessing Jets in J1328+2751
• The Discovery of Secondary Lobes in the Seyfert Galaxy NGC 2639
• Multifrequency study of a double-double radio galaxy J0028+0035
• Search and analysis of giant radio galaxies with associated nuclei (SAGAN) V. Study of giant double-double radio galaxies from LoTSS DR2
• Relativistic AGN jets III. Synthesis of synchrotron emission from Double-Double Radio Galaxies