Magnetic fields in the multiphase interstellar medium

摘要

We discuss the interstellar magnetic field and its measurement in the different phases of the interstellar medium. The measurement techniques include Faraday rotation, Zeeman splitting, linear polarization from aligned dust grains, and the Chandrasekhar-Fermi method. The phases include the classical ones: molecular clouds, the Cold and Warm Neutral Media, the Warm and Hot Ionized Media. We also include a less well-known phase, the Warm Partially Ionized Medium, which can be surprisingly prominent in Faraday rotation.