Outflows in the Seyfert 2 galaxy NGC5643 traced by the [SIII] emission

TL;DR

This study maps the ionized gas outflows and stellar kinematics in the Seyfert 2 galaxy NGC 5643 using integral field spectroscopy, revealing outflows within a bi-cone and stellar rotation.

Contribution

It provides detailed spatially-resolved analysis of gas outflows and stellar dynamics in NGC 5643, highlighting the interplay between nuclear activity and host galaxy kinematics.

Findings

Detection of ionized gas outflows at 0.3 M$_\ m\odot$ yr$^{-1}$

Identification of stellar rotation with a velocity of 100 km/s

Presence of a young stellar population ring around the nucleus

Abstract

We use Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU) observations of the inner 285$\times$400 pc$^2$ region of the Seyfert 2 galaxy NGC 5643 to map the [SIII]$\lambda9069$ emission-line flux distribution and kinematics, as well as the stellar kinematics, derived by fitting the CaII$\lambda\lambda\lambda$8498,8542,8662 triplet, at a spatial resolution of 45 pc. The stellar velocity field shows regular rotation, with a projected velocity of 100 km/s and kinematic major axis along Position Angle $PA=-36^\circ$. A ring of low stellar velocity dispersion values ($\sim$70 km/s), attributed to young/intermediate age stellar populations, is seen surrounding the nucleus with radius of 50 pc. We found that the [SIII] flux distribution shows an elongated structure along the east-west direction and its kinematics is dominated by outflows within a bi-cone at an ionized gas outflow rate of 0.3 M$_\odot$ yr$^{-1}$. In addition, velocity slices across the [SIII]$\lambda9069$ emission-line reveal a kinematic component attributed to rotation of gas in the plane of the galaxy.