# The spatial extension of extended narrow line regions in MaNGA AGN

## TL;DR

This study analyzes the size-luminosity relation of extended narrow line regions in AGN using MaNGA data, revealing a consistent log-linear relation across a wide luminosity range that informs on AGN ionization capabilities.

## Contribution

It provides a detailed analysis of the ENLR size-luminosity relation in nearby AGN, extending the relation to high-luminosity quasars and explaining its physical origin.

## Key findings

- A tight log-linear size-luminosity relation with a slope of 0.42.
- The relation holds over four orders of magnitude in luminosity.
- AGN can ionize distant gas clouds without outflows or jets.

## Abstract

In this work, we revisit the size-luminosity relation of the extended narrow line regions (ENLRs) using a large sample of nearby active galactic nuclei (AGN) from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The ENLRs ionized by the AGN are identified through the spatially resolved BPT diagram, which results in a sample of 152 AGN. By combining our AGN with the literature high-luminosity quasars, we found a tight log-linear relation between the size of the ENLR and the AGN [O III]{\lambda}5007{\AA} luminosity over four orders of magnitude of the [O III] luminosity. The slope of this relation is 0.42 $\pm$ 0.02 which can be explained in terms of a distribution of clouds photoionized by the AGN. This relation also indicates the AGN have the potential to ionize and heat the gas clouds at a large distance from the nuclei without the aids of outflows and jets for the low-luminosity Seyferts.