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Galactic and Intergalactic Magnetic Fields pp 125–150Cite as

Magnetic Fields in Galaxies

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Abstract

The hadronic constituent of galaxies consists of gas and stars, with only a minor contribution of dust. These components rotate in a gravitational potential made up by stars and dark matter. In spiral galaxies, the gas has a neutral and an ionised phase. The neutral phase is made up by (in order of decreasing density) the molecular medium, the cold neutral medium (CNM), and the warm neutral medium (WNM). The ionised phase consists of the warm (WIM) and the hot (HIM) ionised medium (Table 5.1).

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Notes

  1. 1.

    There have been discussions in the literature as to whether magnetic fields could be responsible for flat rotation curves, but this is flatly impossible in view of the energy density of magnetic fields in the ISM!

  2. 2.

    The observed polarisation angles, given by Eq. (3.8), are oriented parallel to the electric field. These are rotated by 90∘ to obtain the magnetic field orientation, sometimes called the “B-vectors”.

  3. 3.

    The term ‘pointed’ means weak edge-on disks.

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Authors and Affiliations

  1. Argelander-Institut für Astronomie, Universiät Bonn, Bonn, Germany

    Ulrich Klein

  2. School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, UK

    Andrew Fletcher

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  1. Ulrich Klein
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  2. Andrew Fletcher
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Klein, U., Fletcher, A. (2015). Magnetic Fields in Galaxies. In: Galactic and Intergalactic Magnetic Fields. Springer Praxis Books. Springer, Cham. https://doi.org/10.1007/978-3-319-08942-3_5

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