Magnetic fields in galactic haloes

Abstract

Magnetic fields on a range of scales play a large role in the ecosystems of galaxies, both in the galactic disk and in the extended layers of gas away from the plane. Observing magnetic field strength, structure and orientation is complex, and necessarily indirect. Observational data of magnetic fields in the halo of the Milky Way are scarce, and non-conclusive about the large-scale structure of the field. In external galaxies, various large-scale configurations of magnetic fields are measured, but many uncertainties about exact configurations and their origin remain. There is a strong interaction between magnetic fields and other components in the interstellar medium such as ionized and neutral gas and cosmic rays. The energy densities of these components are comparable on large scales, indicating that magnetic fields are not passive tracers but that magnetic field feedback on the other interstellar medium components needs to be taken into account.

13 pages, 7 figures. Accepted in Space Science Reviews

References in corpus (9)

• Radio observational constraints on Galactic 3D-emission models
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization rings, dynamo modes and helical fields
• Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253
• Magnetically Dominated Strands of Cold Hydrogen in the Riegel-Crutcher Cloud
• Structure in the Rotation Measure Sky
• Antisymmetry in the Faraday Rotation Sky Caused by a Nearby Magnetized Bubble
• Three-Dimensional Simulations of Magnetized Superbubbles: New Insights into the Importance of MHD Effects on Observed Quantities
• The WENSS and Dwingeloo surveys and the Galactic magnetic field

Cited by in corpus (22)

• The Fermi Bubbles: Supersonic AGN Jets with Anisotropic Cosmic Ray Diffusion
• Magnetic Fields in the Milky Way
• Magnetic Field Structure of the Large Magellanic Cloud from Faraday Rotation Measures of Diffuse Polarized Emission
• The Coherent Magnetic Field of the Milky Way
• Radio haloes in nearby galaxies modelled with 1D cosmic-ray transport using SPINNAKER
• Analytical models of X-shape magnetic fields in galactic halos
• Constraints on dark matter annihilation by radio observations of M31
• Constraints from Faraday rotation on the magnetic field structure in the Galactic halo
• The Accretion Wind Model of the Fermi Bubbles (II): Radiation
• The extent of magnetic fields around galaxies out to z ~ 1
• Collisional and Radiative Processes in Optically Thin Plasmas
• The magnetized disk-halo transition region of M51
• The Magnetized Disk-Halo Transition Region of M51
• Probing large-scale magnetism with the Cosmic Microwave Background
• Theoretical Explanation of the Cosmic Ray Perpendicular Diffusion Coefficient in the Nearby Starburst Galaxy NGC 253
• Constraints from globular cluster pulsars on the magnetic field in the Galactic halo
• Dark matter implications of the WMAP-Planck Haze
• Updated constraints on WIMP dark matter annihilation by radio observations of M31
• Magnetic Fields in the Milky Way and in Galaxies (revised version of September 2023)
• CHANG-ES XXXIV: Magnetic Field Structure in Edge-On Galaxies Characterising large-scale magnetic fields in galactic halos
• Influence of Magnetic Fields on the Gas Rotation in the Galaxy $NGC6946$
• Limits on Dark Matter Annihilation from the Shape of Radio Emission in M31