# The rare extended radio-loud narrow-line Seyfert 1 galaxy SDSS J1030+5516 at high resolution

## TL;DR

This study presents high-resolution radio imaging of the rare radio-loud narrow-line Seyfert 1 galaxy SDSS J1030+5516, revealing its structure and supporting its classification as a young Fanaroff-Riley type II radio galaxy.

## Contribution

First high-resolution radio imaging analysis of SDSS J1030+5516, revealing detailed structure and supporting its classification as a young FR II radio galaxy.

## Key findings

- Detection of hotspots and a compact core at arcsec scale with VLA.
- Observation of a milliarcsec-scale compact core with VLBA.
- No gamma-ray emission detected by Fermi LAT.

## Abstract

Recently, Rakshit et al. (2018) reported the discovery of SDSS J103024.95$+$551622.7, a radio-loud narrow-line Seyfert 1 galaxy having a $\sim 100$ kpc scale double-lobed radio structure. Here we analyse archival radio interferometric imaging data taken with the Very Large Array (VLA) at 5 GHz, and with the Very Long Baseline Array (VLBA) at 4.3 and 7.6 GHz. Two hotspots and a compact core are detected with the VLA at arcsec scale, while a single milliarcsec-scale compact radio core is seen with the highest resolution VLBA observations. The Fermi Large Area Telescope did not detect $\gamma$-ray emission at the position of this source. In the mid-infrared, the Wide-field Infrared Survey Explorer satellite light curve, covering more than 7 years and including the most recent data points, hints on flux density variability at 3.4 $\mu$m. Our findings support the notion that this source is a young version of Fanaroff-Riley type II radio galaxies.