Interplay of CR-driven galactic wind, magnetic field, and galactic dynamo in spiral galaxies

TL;DR

This paper investigates how cosmic-ray-driven galactic winds, magnetic fields, and dynamo processes interact in spiral galaxies, revealing that star formation influences magnetic strength but not the overall field structure or scale heights.

Contribution

It demonstrates that star formation rate affects magnetic field strength but not the global magnetic configuration or scale heights, highlighting the role of magnetic fields in regulating galactic winds and dynamo activity.

Findings

Star formation increases magnetic field strength in disks and halos.

Magnetic field configuration remains unaffected by star formation rate.

Magnetic fields regulate galactic wind velocities.

Abstract

From our radio observations of the magnetic field strength and large-scale pattern of spiral galaxies of different Hubble types and star formation rates (SFR) we conclude that - though a high SFR in the disk increases the total magnetic field strength in the disk and the halo - the SFR does not change the global field configuration nor influence the global scale heights of the radio emission. The similar scale heights indicate that the total magnetic field regulates the galactic wind velocities. The galactic wind itself may be essential for an effective dynamo action.