# The Jet of FSRQ PKS~1229$-$02 and its Misidentification as a $\gamma$-ray AGN

## TL;DR

This study investigates the jet properties of PKS 1229-02, revealing that its asymmetric morphology results from jet-medium interactions and that it likely is not a gamma-ray emitting AGN, challenging previous identifications.

## Contribution

The paper provides detailed radio interferometry analysis of PKS 1229-02, showing its jet morphology and kinematics, and clarifies its non-association with gamma-ray emission due to weak relativistic beaming.

## Key findings

- Jet morphology shaped by interaction with dense ambient medium
- PKS 1229-02 unlikely to be a gamma-ray AGN
- Previous gamma-ray identification likely due to poor resolution

## Abstract

Flat-spectrum radio quasar PKS~1229$-$02 with a knotty and asymmetric radio morphology was identified as the optical and radio counterpart of a $\gamma$-ray source. In this paper, we study the properties, e.g. morphology, opacity, polarization and kinematics of the jet in PKS~1229$-$02 using radio interferometry. With our results, we find that the knotty and asymmetric morphology of this source may probably shaped by the interaction between its anterograde jet and the nonuniform dense ambient medium. By reproducing a Spectral Energy Distribution of PKS~1229$-$02 with the obtained kinematic parameters, we find that the relativistic beaming effect in PKS~1229$-$02 is not strong enough to produce the reported $\gamma$-ray emission, i.e. PKS~1229$-$02 may not be a $\gamma$-ray AGN. The misidentification may probably due to the poor spatial resolution of the $\gamma$-ray detector of the previous generation.