A Multi-frequency Study of the Candidate Double-Double Radio Galaxy J2349-0003 with a Possible Misalignment

TL;DR

This study analyzes the complex multi-frequency radio morphology of the candidate double-double radio galaxy J2349-0003, revealing multiple AGN activity episodes, possible jet reorientation, and environmental influences on its structure and evolution.

Contribution

It provides the first detailed multi-frequency analysis of J2349-0003, identifying its double-double structure, spectral ages, and potential triple-double nature, highlighting environmental effects and merger influences.

Findings

Identified two distinct AGN activity episodes with spectral age estimates.

Detected possible triple-double radio galaxy features due to core activity.

Indicated environmental effects on source symmetry and morphology.

Abstract

We present a multi-frequency analysis of the candidate double-double radio galaxy (DDRG) J2349-0003, exhibiting a possible lobe misalignment. High-resolution uGMRT observations at Bands 3 and 4 reveal a complex radio morphology featuring a pair of inner and outer lobes, and the radio core, while the Band 5 image detects the core and the compact components. The positioning of both pairs of lobes with the central core supports its classification as a DDRG. Spectral age estimates for the inner and outer lobes indicate two distinct episodes of active galactic nucleus (AGN) activity interspaced by a short quiescent phase. The possible compact steep spectrum nature of the core, together with its concave spectral curvature, suggests ongoing or recent jet activity, suggesting the possibility that J2349-0003 may be a candidate triple-double radio galaxy. With a projected linear size of 1.08 Mpc, J2349-0003 is classified as a giant radio galaxy (GRG), although its moderate radio power (~10^24 W/Hz) suggests a sparse surrounding environment. Arm-length (R_theta) and flux density ratios (R_S) indicates environmental influences on source symmetry. The observed lobe misalignment and the presence of nearby galaxies in the optical image suggest that merger-driven processes may have played a key role in shaping the source's evolution.