Magnetic fields in galactic haloes

Details Magnetic fields in galactic haloes Magnetic fields in galactic haloes

2011-02-17

arxiv.org/abs/1102.3701v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

13 pages, 7 figures. Accepted in Space Science Reviews

Scientific paper

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.

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