Galactic Wind in NGC 4460: New Observations

TL;DR

This study uses Halpha observations to analyze the ionized gas kinematics in NGC 4460, revealing that the galactic wind's velocities are insufficient for gas escape, refining understanding of galactic outflows.

Contribution

It provides new measurements of gas outflow velocities in NGC 4460, demonstrating the variability of wind speeds and their inability to escape the galaxy, based on Fabry-Perot interferometry.

Findings

Outflow velocities range from 30 to 80 km/s.

The wind velocities are insufficient for gas escape.

Gas outflow parameters were refined using a geometric model.

Abstract

NGC4460 is an isolated lenticular galaxy, in which galactic wind has been earlier discovered as a gas outflow associated with circumnuclear regions of star formation. Using the results of observations in the Halpha line with the scanning Fabry-Perot interferometer on the SAO RAS 6-m telescope, we studied the kinematics of the ionized gas in this galaxy. The parameters of gas outflow from the plane of the galactic disk were refined within a simple geometric model. We show that it is impossible to characterize the wind by a fixed velocity value. Characteristic outflow velocities are within 30..80 km/s , and they are insufficient to make the swept-out matter ultimately leave the galaxy.