The SAMI Galaxy Survey: Disk-halo interactions in radio-selected star-forming galaxies

TL;DR

This study investigates the relationship between radio emissions and optical outflow signatures in edge-on star-forming galaxies, revealing that galaxies with strong wind signatures exhibit extended radio morphologies, aiding understanding of galactic wind mechanisms.

Contribution

The paper presents new observations linking radio morphology with optical wind signatures in star-forming galaxies, providing insights into wind driving processes.

Findings

Galaxies with optical wind signatures often show extended radio structures.

Strong wind signatures correlate with enhanced radio emission.

Results establish a baseline for understanding galactic wind driving mechanisms.

Abstract

In this paper, we compare the radio emission at 1.4 GHz with optical outflow signatures of edge-on galaxies. We report observations of six edge-on star-forming galaxies in the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) Galaxy Survey with 1.4 GHz luminosities $> 1\times10^{21}$ W Hz$^{-1}$. Extended minor axis optical emission is detected with enhanced \nii/H$\alpha$ line ratios and velocity dispersions consistent with galactic winds in three of six galaxies. These galaxies may host outflows driven by a combination of thermal and cosmic ray processes. We find that galaxies with the strongest wind signatures have extended radio morphologies. Our results form a baseline for understanding the driving mechanisms of galactic winds.