The colour of the narrow line Sy1-blazar 0324+3410

TL;DR

This study analyzes the host galaxy of blazar J0324+3410, revealing a ring-like structure with bluish zones indicating active star formation possibly triggered by galaxy interaction or merging.

Contribution

It provides detailed morphological and color analysis of the host galaxy, highlighting features linked to star formation and nuclear activity in a blazar host.

Findings

Host galaxy has a ring-like morphology.

Bluish zones indicate active star formation.

Possible link between galaxy interaction and starburst activity.

Abstract

Aims. We investigate the properties of the host galaxy of the blazar J0324+3410 (B2 0321+33) by the analysis of B and R images obtained with the NOT under good photometric conditions. Methods: The galaxy was studied using different methods: Sersic model fitting, unsharp-masked images, B-R image and B-R profile analysis. Results: The images show that the host galaxy has a ring-like morphology. The B-R colour image reveals two bluish zones: one that coincides with the nuclear region, interpreted as the signature of emission related to the active nucleus, the other zone is extended and is located in the host ring-structure. We discuss the hypothesis that the later is thermal emission from a burst of star formation triggered by an interacting/merging process.