# The luminous infrared composite Seyfert 2 galaxy NGC 7679 through the [O III] 5007 emission line

## TL;DR

This study investigates the gas distribution and ionization structure of the Seyfert 2 galaxy NGC 7679 using [O III] 5007 emission, revealing insights into its AGN activity and the nature of unabsorbed Sy2 galaxies.

## Contribution

It provides detailed imaging and analysis of the ionization structure in NGC 7679, highlighting the presence of a hidden AGN and challenging simple unified models for Sy2 galaxies.

## Key findings

- [O III] emission shows elliptical isophotes aligned with a nearby galaxy.
- Ionization maximum is displaced eastward from the nucleus.
- Unabsorbed Sy2s with high [O III] luminosity often host hidden AGN.

## Abstract

NGC 7679 is a nearby luminous infrared Sy2 galaxy in which starburst and AGN activities co-exist. The ionization structure is maintained by both the AGN power-law continuum and starburst. The galaxy is a bright X-ray source possessing a low X-ray column density N_H < 4 x 10^20 cm^{-2}. The Compton-thin nature of such unabsorbed objects infers that the simple formulation of the Unified model for SyGs is not applicable in their case. The main goal of this article is to investigate both gas distribution and ionization structure in the circumnuclear region of NGC 7679 in search for the presence of a hidden Sy1 nucleus, using the [O III] 5007 luminosity as a tracer of AGN activity. The [O III] 5007 image of the NGC 7679 shows elliptical isophotes extended along the PA ~ 80 deg in the direction to the counterpart galaxy NGC 7682. The maximum of ionization by the AGN power-law continuum traced by [O III] 5007/Halpha ratio is displaced by ~ 13 arcsec eastward from the nucleus. We conclude that the dust and gas in the high ionization direction has a direct view to the central AGN engine. This possibly results in dust/star-formation decay. A large fraction of the unabsorbed Compton-thin Sy2s with [O III] luminosity > 10^41 erg s^{-1} possesses a hidden AGN source (abridged).