# SDSS J094635.06+101706.1: a redshift one, very radio-loud, {\gamma}-ray emitting narrow-line Seyfert 1 galaxy

## TL;DR

This paper reports the discovery of SDSS J094635.06+101706.1 as the most distant gamma-ray emitting narrow-line Seyfert 1 galaxy at redshift 1.004, characterized by extreme radio loudness, variability, and extended radio emission, providing insights into jet physics at high Eddington ratios.

## Contribution

It identifies and characterizes the most distant gamma-ray emitting NLS1 galaxy, expanding understanding of high-redshift jet physics and the properties of radio-loud NLS1s.

## Key findings

- Most distant gamma-ray NLS1 at z=1.004.
- Highly radio-loud and variable at multiple wavelengths.
- Extended radio emission over >100 kpc.

## Abstract

As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, {\gamma}-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. Here we present the identification of the {\gamma}-ray emitting AGN TXS 0943+105 (SDSS J094635.06+101706.1) as a high-redshift NLS1 galaxy. It turns out to be one of the radio-loudest NLS1s known, highly variable at all wavelengths, and shows widely extended radio emission at a (projected) > 100 kpc scale. It is a known strong {\gamma}-ray emitter with a luminous flare reported previously. At redshift z=1.004, this is the most distant {\gamma}-NLS1 known to date.