# Numerical Study on Outflows in Seyfert Galaxies I: Narrow Line Region Outflows in NGC 4151

## TL;DR

This study uses 3D hydrodynamical simulations to explore whether energetic accretion disk winds can drive the narrow line region outflows in NGC 4151, matching observed velocity and luminosity distributions.

## Contribution

It demonstrates the viability of disk wind-driven NLR outflows in NGC 4151 through detailed simulations aligned with observations.

## Key findings

- Simulations reproduce observed NLR outflow properties within 100 pc.
- Disk wind kinetic luminosity is comparable to ultrafast outflows detected in X-ray spectra.
- The scenario suggests observable impacts on higher density ISM, such as shock excitation signs.

## Abstract

The origin of narrow line region (NLR) outflows remains unknown. In this paper, we explore the scenario in which these outflows are circumnuclear clouds driven by energetic accretion disk winds. We choose the well-studied nearby Seyfert galaxy NGC 4151 as an example. By performing 3D hydrodynamical simulations, we are able to reproduce the radial distributions of velocity, mass outflow rate and kinetic luminosity of NLR outflows in the inner 100 pc deduced from spatial resolved spectroscopic observations. The demanded kinetic luminosity of disk winds is about two orders of magnitude higher than that inferred from the NLR outflows, but is close to the ultrafast outflows (UFO) detected in X-ray spectrum and a few times lower than the bolometric luminosity of the Seyfert. Our simulations imply that the scenario is viable for NGC 4151. The existence of the underlying disk winds can be confirmed by their impacts on higher density ISM, e.g., shock excitation signs, and the pressure in NLR.