2D kinematics of the edge-on spiral galaxy ESO 379-G006

TL;DR

This study uses Fabry-Perot spectroscopy to analyze the kinematics of the edge-on galaxy ESO 379-G006, revealing extraplanar ionized gas, deviations from circular motion, and possible lagging in extraplanar gas rotation.

Contribution

It provides the first detailed kinematic analysis of ESO 379-G006, identifying extraplanar ionized gas and modeling non-circular motions likely caused by a bar or spiral arms.

Findings

Detection of extraplanar diffuse ionized gas.

Evidence of radial inflow possibly due to a bar or spiral arms.

Extraplanar gas may lag in rotation velocity.

Abstract

We present a kinematical study of the nearly edge-on galaxy ESO 379-G006 that shows the existence of extraplanar ionized gas. With Fabry-Perot spectroscopy at H-alpha, we study the kinematics of ESO 379-G006 using velocity maps and position-velocity diagrams parallel to the major and to the minor axis of the galaxy. We build the rotation curve of the disk and discuss the role of projection effects due to the fact of viewing this galaxy nearly edge-on. The twisting of the isovelocities in the radial velocity field of the disk of ESO 379-G006 as well as the kinematic asymmetries found in some position-velocity diagrams parallel to the minor axis of the galaxy suggest the existence of deviations to circular motions in the disk that can be modeled and explained with the inclusion of a radial inflow probably generated by a bar or by spiral arms. We succeeded in detecting extraplanar Diffuse Ionized Gas in this galaxy. At the same time, from the analysis of position-velocity diagrams, we found some evidence that the extraplanar gas could lag in rotation velocity with respect to the midplane rotation.